Jarron M Leisenring

Interests

Research

Astrobiology, Exoplanets & Planets, Adaptive Optics & High Contrast Imaging, CCD and CMOS Imaging Sensors, Infrared Detectors & Instrumentation

Courses

No activities entered.

Scholarly Contributions

Journals/Publications

• Balmer, W. O., Kammerer, J., Pueyo, L., Perrin, M. D., Girard, J. H., Leisenring, J. M., Lawson, K., Dennen, H., van der Marel, R. P., Beichman, C. A., Bryden, G., Llop-Sayson, J., Valenti, J. A., Lothringer, J. D., Lewis, N. K., Mâlin, M., Rebollido, I., Rickman, E., Hoch, K. K., , Soummer, R., et al. (2025). JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO2 in the HR 8799 and 51 Eri Exoplanets’ Atmospheres. Astronomical Journal, 169(Issue 4). doi:10.3847/1538-3881/adb1c6
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  High-contrast observations with JWST can reveal key composition and vertical mixing dependent absorption features in the spectra of directly imaged planets across the 3-5 μm wavelength range. We present novel coronagraphic images of the HR 8799 and 51 Eri planetary systems using the NIRCam Long Wavelength Bar in an offset “narrow” position. These observations have revealed the four known gas giant planets encircling HR 8799, even at spatial separations challenging for a 6.5 m telescope in the mid-infrared, including the first ever detection of HR 8799 e at 4.6 μm. The chosen filters constrain the strength of CO, CH4, and CO2 absorption in each planet’s photosphere. The planets display a diversity of 3-5 μm colors that could be due to differences in composition and ultimately be used to trace their formation history. They also show stronger CO2 absorption than expected from solar metallicity models, indicating that they are metal enriched. We detected 51 Eri b at 4.1 μm and not at longer wavelengths, which, given the planet’s temperature, is indicative of out-of-equilibrium carbon chemistry and an enhanced metallicity. Updated orbits fit to the new measurement of 51 Eri b validate previous studies that find a preference for high eccentricities ( e = 0.5 7 − 0.09 + 0.03 ), which likely indicates some dynamical processing in the system’s past. These results present an exciting opportunity to model the atmospheres and formation histories of these planets in more detail in the near future, and are complementary to future higher-resolution, continuum-subtracted JWST spectroscopy.
• Barbato, D., Mesa, D., D'Orazi, V., Desidera, S., Ruggieri, A., Farinato, J., Marafatto, L., Carolo, E., Vassallo, D., Ertel, S., Hom, J., Anche, R., Battaini, F., Becker, A., Bergomi, M., Biondi, F., Cardwell, A., Cerpelloni, P., Chauvin, G., , Chinellato, S., et al. (2025). A multi-technique detection of an eccentric giant planet around the accelerating star HD 57625. Astronomy and Astrophysics, 693. doi:10.1051/0004-6361/202452832
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  Context. The synergy between different detection methods is a key asset in exoplanetology that allows the precise characterization of detected exoplanets and robust constraints even in the case of a non-detection. The interplay between imaging, radial velocities and astrometry has recently produced significant advancements in exoplanetary science. Aims. We report a first result of an ongoing survey performed with SHARK-NIR, the new high-contrast near-infrared imaging camera at the Large Binocular Telescope, in parallel with LBTI/LMIRCam in order to detect planetary companions around stars with a significant proper motion anomaly. We focus on HD 57625, a F8 star for which we determine a 4.8-2.9+3.7 Ga age, exhibiting significant astrometric acceleration and for which archival radial velocities indicate a previously undetected massive long-period companion. Methods. We analysed the imaging data we collected with SHARK-NIR and LMIRCam in synergy with the available public SOPHIE radial velocity time series and HIPPARCOS-Gaia proper motion anomaly. With this joint multi-technique analysis, we characterised the companion causing the astrometric and radial velocity signals. Results. The imaging observations result in a non-detection, indicating the companion to be in the substellar regime. This is confirmed by the synergic analysis of archival radial velocity and astrometric measurements resulting in the detection of HD 57625 b, a 8.43-0.91+1.1 MJup planetary companion with an orbital separation of 5.70-0.13+0.14 au and an eccentricity of 0.52-0.03+0.04. Conclusions. HD 57625 b joins the small but growing population of giant planets on outer orbits with a true mass determination provided by the synergic usage of multiple detection methods. This again proves the importance of a multi-technique analysis in providing a robust characterization of planetary companions.
• Beichman, C., Bryden, G., Llop-Sayson, J., Ygouf, M., Greenbaum, A., Leisenring, J., Gaspar, A., Krist, J., Rieke, G., Wolff, S., Su, K., Hodapp, K., Meyer, M., Kelly, D., Boyer, M., Johnstone, D., Horner, S., & Rieke, M. (2025). Searching for Planets Orbiting Vega with the James Webb Space Telescope. Astronomical Journal, 169(Issue 1). doi:10.3847/1538-3881/ad890d
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  The most prominent of the IRAS debris disk systems, α Lyrae (Vega), at a distance of 7.7 pc, has been observed by both the NIRCam and MIRI instruments on the James Webb Space Telescope. This paper describes NIRCam coronagraphic observations, which have achieved F444W contrast levels of 3 × 10−7 at 1″ (7.7 au), 1 × 10−7 at 2″ (15 au), and a few × 10−8 beyond 5″ (38 au), corresponding to masses of
• Beichman, C., Sanghi, A., Mawet, D., Kervella, P., Wagner, K., Quarles, B., Lissauer, J. J., Sommer, M., Wyatt, M., Godoy, N., Balmer, W. O., Pueyo, L., Llop-Sayson, J., Aguilar, J., Akeson, R., Belikov, R., Boccaletti, A., Choquet, E., Fomalont, E., , Henning, T., et al. (2025). Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of α Centauri A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits. Astrophysical Journal Letters, 989(Issue 2). doi:10.3847/2041-8213/adf53f
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  We report on coronagraphic observations of the nearest solar-type star, α Centauri A (α Cen A), using the MIRI instrument on the James Webb Space Telescope. The proximity of α Cen (1.33 pc) means that the star’s habitable zone is spatially resolved at mid-infrared wavelengths, so sufficiently large planets or quantities of exozodiacal dust would be detectable via direct imaging. With three epochs of observation (2024 August, 2025 February, and 2025 April), we achieve a sensitivity sufficient to detect Teff ≈ 225-250 K (1-1.2 RJup) planets between 1″-2″ and exozodiacal dust emission at the level of >5-8× the brightness of our own zodiacal cloud. The lack of exozodiacal dust emission sets an unprecedented limit of a few times the brightness of our own zodiacal cloud—a factor of ≳10 more sensitive than measured toward any other stellar system to date. In 2024 August, we detected an Fν(15.5 μm) = 3.5 mJy point source, called S1, at a separation of 1 . ″ 5 from α Cen A at a contrast level of 5.5 × 10−5. Because the 2024 August epoch had only one successful observation at a single roll angle, it is not possible to unambiguously confirm S1 as a bona fide planet. Our analysis confirms that S1 is neither a background nor a foreground object. S1 is not recovered in the 2025 February and April epochs. However, if S1 is the counterpart of the object C1, seen by the Very Large Telescope/New Earths in Alpha Centauri Region program in 2019, we find that there is a 52% chance that the S1 + C1 candidate was missed in both follow-up JWST/MIRI observations due to orbital motion. Incorporating constraints from the nondetections, we obtain families of dynamically stable orbits for S1 + C1 with periods between 2 and 3 yr. These suggest that the planet candidate is on an eccentric (e ≈ 0.4) orbit significantly inclined with respect to the α Cen AB orbital plane (imutual ≈ 50∘, prograde, or ≈130∘, retrograde). Based on the photometry and inferred orbital properties, the planet candidate could have a temperature of 225 K, a radius of ≈1-1.1 RJup, and a mass between 90 and 150 M⊕, consistent with radial velocity limits. This Letter is first in a series of two papers: Paper II discusses the data reduction strategy and finds that S1 is robust as a planet candidate, as opposed to an image or detector artifact.
• Bogat, E., Schlieder, J. E., Lawson, K. D., Li, Y., Leisenring, J. M., Meyer, M. R., Balmer, W., Barclay, T., Beichman, C. A., Bryden, G., Calissendorff, P., Carter, A. L., De Furio, M., Girard, J. H., Greene, T. P., Groff, T. D., Kammerer, J., Llop-Sayson, J., McElwain, M. W., , Rieke, M. J., et al. (2025). Probing the Outskirts of M Dwarf Planetary Systems with a Cycle 1 JWST NIRCam Coronagraphy Survey. Astronomical Journal, 170(Issue 4). doi:10.3847/1538-3881/adfc75
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  The population of giant planets on wide orbits around low-mass M dwarf stars is poorly understood, but the unprecedented sensitivity of JWST NIRCam coronagraphic imaging now provides direct access to planets significantly less massive than Jupiter beyond 10 au around the closest, youngest M dwarfs. We present the design, observations, and results of JWST Guaranteed Time Observation Program 1184, a Cycle 1 NIRCam coronagraphic imaging survey of nine very nearby and young low-mass stars at 3-5 μm wavelengths. In the F356W and F444W filters, we achieve survey median 5σ contrasts deeper than 10−5 at a separation of 1″, corresponding to 0.20 MJup in F444W and 1.30 MJup in F356W at planet-star separations of 10 au. Our results include 3-5 μm debris disk detections and the identification of many extended and point-like sources in the final postprocessed images. In particular, we have identified a marginal point-source candidate having flux and color limits consistent with model predictions for a young sub-Jupiter-mass exoplanet. Under the assumption that the candidate is not confirmed, we place the first direct-imaging occurrence constraints on M dwarf wide-orbit (semimajor axes of 10-100 au), sub-Jupiter-mass exoplanets (0.3-1 MJup). We find frequency limits of
• Bowens, R., Leisenring, J., Meyer, M., Tobin, T., Miller, A., Monnier, J., Viges, E., Hoffmann, B., Montoya, M., Durney, O., West, G., Morzinski, K., Forrest, W., & McMurtry, C. (2025). Commissioning of the MIRAC-5 Mid-infrared Instrument on the MMT. Publications of the Astronomical Society of the Pacific, 137(1). doi:10.1088/1538-3873/ad9ede
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  We present results from commissioning observations of the mid-IR instrument, MIRAC-5, on the 6.5 m MMT telescope. MIRAC-5 is a novel ground-based instrument that utilizes a state-of-the-art GeoSnap (2-13 µm) HgCdTe detector with adaptive optics support from MAPS to study protoplanetary disks, wide-orbit brown dwarfs, planetary companions in the contrast-limit, and a wide range of other astrophysical objects. We have used MIRAC-5 on six engineering observing runs, improving its performance and defining operating procedures. We characterize key aspects of MIRAC-5's performance, including verification that the total telescope, atmosphere, instrument, and detector throughput is approximately 10%. Following a planned dichroic upgrade, the system will have a throughput of 20% and background limiting magnitudes (for SNR = 5 and 8 hr exposure times) of 18.0, 15.6, and 12.6 for the L’, M’, and N’ filters, respectively. The detector pixels experience 1/f noise but, if the astrophysical scene is properly modulated via chopping and nodding sequences, it is less than 10% the Poisson noise from the observed background in an 85 Hz frame. We achieve close to diffraction-limited performance in the N-band and all bands are expected to reach diffraction-limited performance following the adaptive optics system commissioning. We also present an exposure time calculator calibrated to the on-sky results. In its current state, MIRAC-5 will be capable of achieving several scientific objectives including the observation of warm wide-orbit companions. Once the adaptive optics is commissioned and a coronagraph installed in 2025, MIRAC-5 will have contrast-limited performance comparable to JWST, opening new and complementary science investigations for close-in companions.
• Crotts, K. A., Carter, A. L., Lawson, K., Mang, J., Biller, B., Booth, M., Ferrer-Chavez, R., Girard, J. H., Lagrange, A. M., Liu, M. C., Marino, S., Millar-Blanchaer, M. A., Skemer, A., Strampelli, G. M., Wang, J., Absil, O., Balmer, W. O., Bendahan-West, R., Bogat, E., , Bowens-Rubin, R., et al. (2025). Follow-up Exploration of the TWA 7 Planet-Disk System with JWST NIRCam. Astrophysical Journal Letters, 987(Issue 2). doi:10.3847/2041-8213/ade798
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  The young M star TWA 7 hosts a bright and near face-on debris disk, which has been imaged from the optical to the submillimeter. The disk displays multiple complex substructures such as three disk components, a large dust clump, and spiral arms, suggesting the presence of planets to actively sculpt these features. The evidence for planets in this disk was further strengthened with the recent detection of a point source compatible with a Saturn-mass planet companion using JWST/MIRI at 11 μm, at the location a planet was predicted to reside based on the disk morphology. In this Letter, we present new observations of the TWA 7 system with JWST/NIRCam in the F200W and F444W filters. The disk is detected at both wavelengths and presents many of the same substructures as previously imaged, although we do not robustly detect the southern spiral arm. Furthermore, we detect two faint potential companions in the F444W filter at the 2σ-3σ level. While one of these companions needs further follow-up to determine its nature, the other one coincides with the location of the planet candidate imaged with MIRI, providing further evidence that this source is a sub-Jupiter-mass planet companion rather than a background galaxy. Such discoveries make TWA 7 only the second system, after β Pictoris, in which a planet predicted by the debris disk morphology has been detected.
• De Furio, M., Meyer, M. R., Greene, T., Hodapp, K., Johnstone, D., Leisenring, J., Rieke, M., Robberto, M., Roellig, T., Cugno, G., Fiorellino, E., Manara, C. F., Raileanu, R., & van Terwisga, S. (2025). Identification of a Turnover in the Initial Mass Function of a Young Stellar Cluster Down to 0.5 MJ. Astrophysical Journal Letters, 981(Issue 2). doi:10.3847/2041-8213/adb96a
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  A successful theory of star formation should predict the number of objects as a function of their mass produced through star-forming events. Previous studies in star-forming regions and the solar neighborhood have identified a mass function increasing from the hydrogen-burning limit down to about 10 MJ. Theory predicts a limit to the fragmentation process, providing a natural turnover in the mass function down to the opacity limit of turbulent fragmentation, thought to be near 1-10 MJ. Programs to date have not been sensitive enough to probe the hypothesized opacity limit of fragmentation. We present the first identification of a turnover in the initial mass function below 12 MJ within NGC 2024, a young star-forming region. With JWST/NIRCam deep exposures across 0.7-5 μm, we identified several free-floating objects down to roughly 3 MJ with sensitivity to 0.5 MJ. We present evidence for a double power-law model increasing from about 60 MJ to roughly 12 MJ, consistent with previous studies, followed by a decrease down to 0.5 MJ. Our results support the predictions of star and brown dwarf formation theory, identifying the theoretical turnover in the mass function and suggesting the fundamental limit of turbulent fragmentation to be near 3 MJ
• Doelman, D. S., Stone, J. M., Briesemeister, Z. W., Skemer, A. J., Barman, T., Brock, L. S., Hinz, P. M., Bohn, A., Kenworthy, M., Haffert, S. Y., Snik, F., Ertel, S., Leisenring, J. M., Woodward, C. E., & Skrutskie, M. F. (2022). "L-band Integral Field Spectroscopy of the HR 8799 Planetary System". arXiv e-prints, arXiv:2203.08165.
• Isbell, J., Ertel, S., Pott, J., Weigelt, G., Stalevski, M., Leftley, J., Jaffe, W., Petrov, R., Moszczynski, N., Vermot, P., Hinz, P., Burtscher, L., Becker, A., Carlson, J., Faramaz-Gorka, V., Hoffmann, W., Leisenring, J., Power, J., Wagner, K., & Gámez Rosas, V. (2025).

  Direct imaging of active galactic nucleus outflows and their origin with the 23 m Large Binocular Telescope

  . Nature Astronomy, 9(Issue 3). doi:10.1038/s41550-024-02461-y
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  Active galactic nuclei (AGNs) are a key component of galaxy evolution owing to feedback on the host from its supermassive black hole. The morphology of warm inflowing and outflowing dusty material can reveal the nature of the onset of feedback, AGN feeding and the unified model of AGN. Here we use the Large Binocular Telescope Interferometer (LBTI) to image the dense, obscuring disk and extended dusty outflow region of NGC 1068. In Fizeau imaging mode, the LBTI synthesizes the equivalent resolution of a 22.8 m telescope. The 8.7 μm Fizeau images of NGC 1068 have an effective resolution of 47 × 90 mas (3.3 × 6.2 pc) in a 5″ field of view after performing point spread function deconvolution techniques described here. This is the only extragalactic source to be Fizeau imaged using the LBTI, and the images bridge the scales measured with the Very Large Telescope Interferometer (0.5–5 pc) and those of single telescopes such as James Webb Space Telescope and Keck (>15 pc). The images detect and spatially resolve the low surface brightness mid-infrared features in the AGN disk/wind region that are overresolved by the Very Large Telescope Interferometer. The images show strong correlation between mid-infrared dust emission and near-infrared emission of highly excited atomic lines observed by SINFONI. Such LBTI imaging is a precursor to infrared imaging using the upcoming generation of extremely large telescopes, with angular resolutions up to six times better than James Webb Space Telescope, the largest space telescope in orbit.
• Llop-Sayson, J., Beichman, C., Bryden, G., Ygouf, M., Gaspar, A., Thompson, W., Sanghi, A., Mawet, D., Meshkat, T., Greenbaum, A. Z., Leisenring, J., Wolff, S., Rieke, M., & Rieke, G. (2025). Searching for Planets Orbiting ϵ Eridani with JWST/NIRCam. Astronomical Journal, 170(Issue 4). doi:10.3847/1538-3881/adf727
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  We present observations of ϵ Eridani with the JWST/NIRCam coronagraph aimed at imaging planets orbiting within this system. In particular, these observations targeted (1) the Jupiter-like planet, first detected orbiting at 3.5 au with radial velocity observations, and (2) the planet postulated to be responsible for carving the edges of ϵ Eridani’s outer ring, expected to orbit at 40-50 au. However, no point sources were detected at a statistically significant level. We report new, improved upper limits at 4 μm: ∼1 × 10−6 contrast at 1″, and ∼2 × 10−8 beyond 5″. The latter contrast limit precludes Saturn-mass planets at separations >16 au given current models. We also report upper limits for ϵ Eridani’s disk emission at 4 μm. While the radial surface brightness profile shows no evidence of emission, we detect a 1σ surface brightness signal on the east side of the system, consistent with forward scattering emission expected for ϵ Eridani’s disk inclination. Finally, we evaluate the performance of the 3-roll observation strategy, which was first employed in these observations: the gains in contrast are modest, with 20%-30% improvements with respect to the conventional two-roll strategy.
• Mesa, D., Gratton, R., D'orazi, V., Carolo, E., Vassallo, D., Farinato, J., Marafatto, L., Wagner, K., Hom, J., Ertel, S., Henning, T., Desgrange, C., Barbato, D., Bergomi, M., Cerpelloni, P., Desidera, S., Di Filippo, S., Doelman, D., Machado, T. S., , Greggio, D., et al. (2025). Deep imaging of three accelerating stars using SHARK-NIR and LMIRCam at LBT. Monthly Notices of the Royal Astronomical Society, 536(Issue 2). doi:10.1093/mnras/stae2706
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  The combination of detection techniques enhances our ability to identify companions orbiting nearby stars. We employed high-contrast imaging to constrain mass and separation of possible companions responsible for the significant proper motion anomalies of the nearby stars HIP 11696, HIP 47110, and HIP 36277. These targets were observed using the LBT's high-contrast camera, SHARK-NIR, in H band using a Gaussian coronagraph, and with the LMIRCam instrument in the L' band and using a vAPP coronagraph. Both observations were conducted simultaneously. Additionally, constraints at short separations from the host star are derived analysing the renormalized unit weight error values from the Gaia catalogue. We find that the companion responsible for the anomaly signal of HIP 11696 is likely positioned at a distance from 2.5 to 28 astronomical units from its host. Its mass is estimated to be between 4 and 16 Jupiter masses, with the greater mass possible only at the upper end of the separation range. Similar limits were obtained for HIP 47110 where the companion should reside between 3 and 30 au with a mass between 3 and 10 MJup. For HIP 36277, we identified a faint stellar companion at large separation, though it might be substellar depending on the assumed age for the star. Considering the older age, this object accounts for the absolute value of the PMa vector but not for its direction. Additionally, we found a substellar candidate companion at a closer separation that could explain the PMa signal, considering a younger age for the system.
• Ray, S., Sallum, S., Hinkley, S., Sivaramkrishnan, A., Cooper, R., Kammerer, J., Greebaum, A. Z., Thatte, D., Stolker, T., Lazzoni, C., Tokovinin, A., Furio, M. d., Factor, S., Meyer, M., Stone, J. M., Carter, A., Biller, B., Skemer, A., Suárez, G., , Leisenring, J. M., et al. (2025). The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. III. Aperture Masking Interferometric Observations of the Star HIP 65426 at 3.8 μm. Astrophysical Journal Letters, 983(Issue 1). doi:10.3847/2041-8213/adaeb7
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  We present aperture masking interferometry (AMI) observations of the star HIP 65426 at 3.8 μm, as part of the JWST Direct Imaging Early Release Science program, obtained using the Near Infrared Imager and Slitless Spectrograph instrument. This mode provides access to very small inner working angles (even separations slightly below the Michelson limit of 0.5λ/D for an interferometer), which are inaccessible with the classical inner working angles of the JWST coronagraphs. When combined with JWST’s unprecedented infrared sensitivity, this mode has the potential to probe a new portion of parameter space across a wide array of astronomical observations. Using this mode, we are able to achieve a 5σ contrast of ΔmF380M ∼ 7.62 ± 0.13 mag relative to the host star at separations ​​​​​≳0 . ″ 07, and the contrast deteriorates steeply at separations ≲0 . ″ 07. However, we detect no additional companions interior to the known companion HIP 65426b (at separation ∼0 . ″ 82 or 8 7 − 31 + 108 au ). Our observations thus rule out companions more massive than 10-12 MJup at separations ∼10-20 au from HIP 65426, a region out of reach of ground- or space-based coronagraphic imaging. These observations confirm that the AMI mode on JWST is sensitive to planetary mass companions at close-in separations (≳0 . ″ 07), even for thousands of more distant stars at ∼100 pc, in addition to the stars in the nearby young moving groups and associations, as stated in previous works. This result will allow the planning and successful execution of future observations to probe the inner regions of nearby stellar systems, opening an essentially unexplored parameter space.
• Weible, G., Wagner, K., Stone, J., Ertel, S., Apai, D., Kratter, K., & Leisenring, J. (2025). Orbital and Atmospheric Modeling of H ii 1348B: An Eccentric Young Substellar Companion in the Pleiades. Astronomical Journal, 169(Issue 4). doi:10.3847/1538-3881/adadf6
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  Brown dwarfs with known physical properties (e.g., age and mass) are essential for constraining models of the formation and evolution of substellar objects. We present new high-contrast imaging observations of the circumbinary brown dwarf H ii 1348B—one of the few known substellar companions in the Pleiades cluster. We observed the system in the infrared L ′ band with the Large Binocular Telescope Interferometer in dual-aperture direct-imaging mode (i.e., with the two telescope apertures used separately) on 2019 September 18. The observations attained a high signal-to-noise ratio (SNR > 150) photometric detection and relative astrometry with uncertainties of ∼5 mas. This work presents the first model of the companion’s orbital motion using relative astrometry from five epochs across a total baseline of 23 yr. Orbital fits to the compiled data show the companion’s semimajor axis to be a = 14 0 − 30 + 130 au with an eccentricity of e = 0.7 8 − 0.29 + 0.12 . We infer that H ii 1348B has a mass of 60-63 ± 2 MJ from comparison to brown dwarf evolutionary models given the well-constrained distance and age of the Pleiades. No other objects were detected in the H ii 1348 system, and through synthetic planet injection and retrievals we establish detection limits at a cluster age of 112 ± 5 Myr down to ∼10-30 MJ for companions with projected separations of 21.5-280 au. With this work, H ii 1348B becomes the second directly imaged substellar companion in the Pleiades with measured orbital motion after HD 23514B.
• Wolff, S. G., Gáspár, A., Rieke, G., Leisenring, J. M., Sefilian, A. A., Ygouf, M., & Llop-Sayson, J. (2025). JWST/MIRI Imaging of the Warm Dust Component of the ϵ Eridani Debris Disk. Astronomical Journal, 170(Issue 4). doi:10.3847/1538-3881/adfcd6
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  We present JWST/MIRI observations of the debris disk surrounding the nearby solar analog ϵ Eridani obtained as part of the Archetypal Debris Disk Good Time Observation program. Multiwavelength images from 15, 18, 21, and 25.5 μm show a smooth dust distribution with no evidence of sculpting by massive planets outside of 5 au. Maps of the color temperature and opacity constrain the dust properties, while radiative transfer modeling of a warm dust component traces the interaction between the debris disk and ϵ Eridani b (∼3.5 au). Dynamical and collisional modeling further shows that the disk morphology is dominated by dust produced in the outer planetesimal belt (∼70 au) moving inward via stellar wind drag. We confirm the presence of a disk interior to the ϵ Eri b orbit first detected from mid-IR interferometry. Drag-dominated inner disk regions have also been observed around Vega and Fomalhaut, hinting at the diversity of asteroid belt analogs.
• Xie, C., Chen, C. H., Lisse, C. M., Hines, D. C., Beck, T., Betti, S. K., Pinilla-Alonso, N., Ingebretsen, C., Worthen, K., Gáspár, A., Wolff, S. G., Bolin, B. T., Pueyo, L., Perrin, M. D., Stansberry, J. A., & Leisenring, J. M. (2025). Water ice in the debris disk around HD 181327. Nature, 641(Issue 8063). doi:10.1038/s41586-025-08920-4
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  Debris disks are exoplanetary systems that contain planets, minor bodies (asteroids, Kuiper belt objects, comets and so on) and micrometre-sized debris dust1. Because water ice is the most common frozen volatile, it plays an essential role in the formation of planets2,3 and minor bodies. Although water ice has been commonly found in Kuiper belt objects and comets in the Solar System4, no definitive evidence for water ice in debris disks has been obtained to date1. Here we report the discovery of water ice in the HD 181327 debris disk using the near-infrared spectrograph onboard the James Webb Space Telescope. We detected the solid-state broad absorption feature of water ice at 3 µm including a distinct Fresnel peak at 3.1 µm, which is indicative of large, crystalline water-ice particles. Gradients in the water-ice feature as a function of stellocentric distance reveal a dynamic environment in which water ice is destroyed and replenished. We estimated the water-ice mass fractions as ranging from 0.1% at approximately 85 au to 21% at approximately 113 au, indicating the presence of a water-ice reservoir in the HD 181327 disk beyond the snow line. The icy bodies that release water ice in HD 181327 are probably the extra-solar counterparts of water-ice-rich Kuiper belt objects in our Solar System.
• Cugno, G., Leisenring, J., Wagner, K., Mullin, C., Dong, R., Greene, T., Johnstone, D., Meyer, M., Wolff, S., Beichman, C., Boyer, M., Horner, S., Hodapp, K., Kelly, D., McCarthy, D., Roellig, T., Rieke, G., Rieke, M., Stansberry, J., & Young, E. (2024). JWST/NIRCam Imaging of Young Stellar Objects. II. Deep Constraints on Giant Planets and a Planet Candidate Outside of the Spiral Disk Around SAO 206462. Astronomical Journal, 167(4). doi:10.3847/1538-3881/ad1ffc
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  We present JWST/NIRCam F187N, F200W, F405N, and F410M direct imaging data of the disk surrounding SAO 206462. Previous images show a very structured disk, with a pair of spiral arms thought to be launched by one or more external perturbers. The spiral features are visible in three of the four filters, with the nondetection in F410M due to the large detector saturation radius. We detect with a signal-to-noise ratio of 4.4 a companion candidate that, if on a coplanar circular orbit, would orbit SAO 206462 at a separation of ∼300 au, 2.25σ away from the predicted separation for the driver of the eastern spiral. No other companion candidates were detected. At the location predicted by simulations of both spirals generated by a single massive companion, the NIRCam data exclude objects more massive than ∼2.2 M J assuming the BEX evolutionary models. In terms of temperatures, the data are sensitive to objects with T eff ∼ 650-850 K, when assuming planets emit like blackbodies (R p between 1 and 3R J). From these results, we conclude that if the spirals are driven by gas giants, these must be either cold or embedded in circumplanetary material. In addition, the NIRCam data provide tight constraints on ongoing accretion processes. In the low extinction scenario we are sensitive to mass accretion rates of the order M ̇ ∼ 10 − 9 M J yr−1. Thanks to the longer wavelengths used to search for emission lines, we reach unprecedented sensitivities to processes with M ̇ ∼ 10 − 7 M J yr−1 even toward highly extincted environments (A V ≈ 50 mag).
• Hainline, K. N., Helton, J. M., Johnson, B. D., Sun, F., Topping, M. W., Leisenring, J. M., Baker, W. M., Eisenstein, D. J., Hausen, R., Hviding, R. E., Lyu, J., Robertson, B., Tacchella, S., Williams, C. C., Willmer, C. N., & Roellig, T. L. (2024). Brown Dwarf Candidates in the JADES and CEERS Extragalactic Surveys. Astrophysical Journal, 964(Issue 1). doi:10.3847/1538-4357/ad20d1
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  By combining the James Webb Space Telescope (JWST)/NIRCam JADES and CEERS extragalactic data sets, we have uncovered a sample of 21 T and Y brown dwarf candidates at best-fit distances between 0.1 and 4.2 kpc. These sources were selected by targeting the blue 1-2.5 μm colors and red 3-4.5 μm colors that arise from molecular absorption in the atmospheres of T eff < 1300 K brown dwarfs. We fit these sources using multiple models of substellar atmospheres and present the resulting fluxes, sizes, effective temperatures, and other derived properties for the sample. If confirmed, these fits place the majority of the sources in the Milky Way thick disk and halo. We observe proper motions for seven of the candidate brown dwarfs, with directions in agreement with the plane of our Galaxy, providing evidence that they are not extragalactic in nature. We demonstrate how the colors of these sources differ from selected high-redshift galaxies, and explore the selection of these sources in planned large-area JWST NIRCam surveys. Deep imaging with JWST/NIRCam presents an an excellent opportunity for finding and understanding these ultracool dwarfs at kiloparsec distances.
• Hainline, K., Sun, F., Helton, J., Miles, B., Marley, M., Lew, B., Leisenring, J., Bunker, A., Cargile, P., Carniani, S., Eisenstein, D., Johnson, B., Robertson, B., Tacchella, S., Williams, C., Willmer, C., D’Eugenio, F., & Juodžbalis, I. (2024). JADES: Spectroscopic Confirmation and Proper Motion for a T-Dwarf at 2 kpc. Astrophysical Journal, 975(1). doi:10.3847/1538-4357/ad76a7
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  Large area observations of extragalactic deep fields with the James Webb Space Telescope (JWST) have provided a wealth of candidate low-mass L- and T-class brown dwarfs. The existence of these sources, which are at derived distances of hundreds of parsecs to several kiloparsecs from the Sun, has strong implications for the low-mass end of the stellar initial mass function, and the link between stars and planets at low metallicities. In this letter, we present a JWST/NIRSpec PRISM spectrum of brown dwarf JADES-GS-BD-9, confirming its photometric selection from observations taken as part of the JWST Advanced Deep Extragalactic Survey (JADES) program. Fits to this spectrum indicate that the brown dwarf has an effective temperature of 800-900 K (T5-T6) at a distance of 1.8-2.3 kpc from the Sun, with evidence of the source being at low metallicity ([M/H] ≤ −0.5). Finally, because of the cadence of JADES NIRCam observations of this source, we additionally uncover a proper motion between the 2022 and 2023 centroids, and we measure a proper motion of 20 ± 4 mas yr−1 (a transverse velocity of 214 km s−1 at 2.25 kpc). At this predicted metallicity, distance, and transverse velocity, it is likely that this source belongs either to the edge of the Milky Way thick disk or the galactic halo. This spectral confirmation demonstrates the efficacy of photometric selection of these important sources across deep extragalactic JWST imaging.
• Lawson, K., Schlieder, J., Leisenring, J., Bogat, E., Beichman, C., Bryden, G., Groff, T., McElwain, M., Meyer, M., Barclay, T., Calissendorff, P., De Furio, M., Li, Y., Rieke, M., Ygouf, M., Greene, T., Girard, J., Gennaro, M., Kammerer, J., , Rest, A., et al. (2024). JWST/NIRCam Detection of the Fomalhaut C Debris Disk in Scattered Light. Astrophysical Journal Letters, 967(1). doi:10.3847/2041-8213/ad4496
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  Observations of debris disks offer important insights into the formation and evolution of planetary systems. Though M dwarfs make up approximately 80% of nearby stars, very few M dwarf debris disks have been studied in detail—making it unclear how or if the information gleaned from studying debris disks around more massive stars extends to the more abundant M dwarf systems. We report the first scattered-light detection of the debris disk around the M4 star Fomalhaut C using JWST's Near Infrared Camera (NIRCam; 3.6 and 4.4 μm). This result adds to the prior sample of only four M dwarf debris disks with detections in scattered light and marks the latest spectral type and oldest star among them. The size and orientation of the disk in these data are generally consistent with the prior Atacama Large Millimeter/submillimeter Array submillimeter detection. Though no companions are identified, these data provide strong constraints on their presence—with sensitivity sufficient to recover sub-Saturn mass objects in the vicinity of the disk. This result illustrates the unique capability of JWST to uncover elusive M dwarf debris disks in scattered light and lays the groundwork for deeper studies of such objects in the 2-5 μm regime.
• Lew, B., Roellig, T., Batalha, N., Line, M., Greene, T., Murkherjee, S., Freedman, R., Meyer, M., Beichman, C., Alves de Oliveira, C., De Furio, M., Johnstone, D., Greenbaum, A., Marley, M., Fortney, J., Young, E., Leisenring, J., Boyer, M., Hodapp, K., , Misselt, K., et al. (2024). High-precision Atmospheric Characterization of a Y Dwarf with JWST NIRSpec G395H Spectroscopy: Isotopologue, C/O Ratio, Metallicity, and the Abundances of Six Molecular Species. Astronomical Journal, 167(5). doi:10.3847/1538-3881/ad3425
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  The launch of the James Webb Space Telescope (JWST) marks a pivotal moment for precise atmospheric characterization of Y dwarfs, the coldest brown dwarf spectral type. In this study, we leverage moderate spectral resolution observations (R ∼ 2700) with the G395H grating of the Near-Infrared Spectrograph (NIRSpec) on board JWST to characterize the nearby (9.9 pc) Y dwarf WISEPA J182831.08+265037.8. With the NIRSpec G395H 2.88-5.12 μm spectrum, we measure the abundances of CO, CO2, CH4, H2S, NH3, and H2O, which are the major carbon-, nitrogen-, oxygen-, and sulfur-bearing species in the atmosphere. Based on the retrieved volume mixing ratios with the atmospheric retrieval framework CHIMERA, we report that the C/O ratio is 0.45 ± 0.01, close to the solar C/O value of 0.458, and the metallicity is +0.30 ± 0.02 dex. Comparison between the retrieval results and the forward modeling results suggests that the model bias for C/O and metallicity could be as high as 0.03 and 0.97 dex, respectively. We also report a lower limit of the 12CO/13CO ratio of >40, being consistent with the nominal solar value of 90. Our results highlight the potential for JWST to measure the C/O ratios down to percent-level precision and characterize isotopologues of cold planetary atmospheres similar to WISE 1828.
• Mullin, C., Dong, R., Leisenring, J., Cugno, G., Greene, T., Johnstone, D., Meyer, M., Wagner, K., Wolff, S., Boyer, M., Horner, S., Hodapp, K., McCarthy, D., Rieke, G., Rieke, M., & Young, E. (2024). JWST/NIRCam Imaging of Young Stellar Objects. III. Detailed Imaging of the Nebular Environment around the HL Tau Disk. Astronomical Journal, 167(4). doi:10.3847/1538-3881/ad2de9
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  As part of the James Webb Space Telescope (JWST) Guaranteed Time Observation program “Direct Imaging of YSOs” (program ID 1179), we use JWST NIRCam’s direct imaging mode in F187N, F200W, F405N, and F410M to perform high-contrast observations of the circumstellar structures surrounding the protostar HL Tau. The data reveal the known stellar envelope, outflow cavity, and streamers, but do not detect any companion candidates. We detect scattered light from an inflowing spiral streamer previously detected in HCO+ by the Atacama Large Millimeter/submillimeter Array, and part of the structure connected to the c-shaped outflow cavity. For detection limits in planet mass we use BEX evolutionary tracks when M p < 2 M J and AMES-COND evolutionary tracks otherwise, assuming a planet age of 1 Myr (youngest available age). Inside the disk region, due to extended envelope emission, our point-source sensitivities are ∼5 mJy (37 M J) at 40 au in F187N and ∼0.37 mJy (5.2 M J) at 140 au in F405N. Outside the disk region, the deepest limits we can reach are ∼0.01 mJy (0.75 M J) at a projected separation ∼ 525 au.
• Petrus, S., Whiteford, N., Patapis, P., Biller, B., Skemer, A., Hinkley, S., Palma-Bifani, P., Morley, C., Tremblin, P., Charnay, B., Vos, J., Wang, J., Stone, J., Bonnefoy, M., Chauvin, G., Miles, B., Carter, A., Lueber, A., Helling, C., , Sutlieff, B., et al. (2024). The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. V. Do Self-consistent Atmospheric Models Represent JWST Spectra? A Showcase with VHS 1256-1257 b. Astrophysical Journal Letters, 966(1). doi:10.3847/2041-8213/ad3e7c
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  The unprecedented medium-resolution (R λ ∼ 1500-3500) near- and mid-infrared (1-18 μm) spectrum provided by JWST for the young (140 ± 20 Myr) low-mass (12-20 M Jup) L-T transition (L7) companion VHS 1256 b gives access to a catalog of molecular absorptions. In this study, we present a comprehensive analysis of this data set utilizing a forward-modeling approach applying our Bayesian framework, ForMoSA. We explore five distinct atmospheric models to assess their performance in estimating key atmospheric parameters: T eff, log(g), [M/H], C/O, γ, f sed, and R. Our findings reveal that each parameter’s estimate is significantly influenced by factors such as the wavelength range considered and the model chosen for the fit. This is attributed to systematic errors in the models and their challenges in accurately replicating the complex atmospheric structure of VHS 1256 b, notably the complexity of its clouds and dust distribution. To propagate the impact of these systematic uncertainties on our atmospheric property estimates, we introduce innovative fitting methodologies based on independent fits performed on different spectral windows. We finally derived a T eff consistent with the spectral type of the target, considering its young age, which is confirmed by our estimate of log(g). Despite the exceptional data quality, attaining robust estimates for chemical abundances [M/H] and C/O, often employed as indicators of formation history, remains challenging. Nevertheless, the pioneering case of JWST’s data for VHS 1256 b has paved the way for future acquisitions of substellar spectra that will be systematically analyzed to directly compare the properties of these objects and correct the systematics in the models.
• Sallum, S., Ray, S., Kammerer, J., Sivaramakrishnan, A., Cooper, R., Greebaum, A., Thatte, D., De Furio, M., Factor, S., Meyer, M., Stone, J., Carter, A., Biller, B., Hinkley, S., Skemer, A., Leisenring, J., Perrin, M., Kraus, A., Absil, O., , Balmer, W., et al. (2024). The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. IV. NIRISS Aperture Masking Interferometry Performance and Lessons Learned. Astrophysical Journal Letters, 963(1). doi:10.3847/2041-8213/ad21fb
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  We present a performance analysis for the aperture masking interferometry (AMI) mode on board the James Webb Space Telescope Near Infrared Imager and Slitless Spectrograph (JWST/NIRISS). Thanks to self-calibrating observables, AMI accesses inner working angles down to and even within the classical diffraction limit. The scientific potential of this mode has recently been demonstrated by the Early Release Science (ERS) 1386 program with a deep search for close-in companions in the HIP 65426 exoplanetary system. As part of ERS 1386, we use the same data set to explore the random, static, and calibration errors of NIRISS AMI observables. We compare the observed noise properties and achievable contrast to theoretical predictions. We explore possible sources of calibration errors and show that differences in charge migration between the observations of HIP 65426 and point-spread function calibration stars can account for the achieved contrast curves. Lastly, we use self-calibration tests to demonstrate that with adequate calibration NIRISS F380M AMI can reach contrast levels of ~9-10 mag at ≥λ/D. These tests lead us to observation planning recommendations and strongly motivate future studies aimed at producing sophisticated calibration strategies taking these systematic effects into account. This will unlock the unprecedented capabilities of JWST/NIRISS AMI, with sensitivity to significantly colder, lower-mass exoplanets than lower-contrast ground-based AMI setups, at orbital separations inaccessible to JWST coronagraphy.
• Su, K., Rieke, G., Malhotra, R., Wolff, S., Leisenring, J., Beichman, C., Ygouf, M., Gáspár, A., & Matrá, L. (2024). Imaging of the Vega Debris System Using JWST/MIRI. Astrophysical Journal, 977(2). doi:10.3847/1538-4357/ad8cde
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  We present images of the Vega planetary debris disk obtained at 15.5, 23, and 25.5 μm with the Mid-Infrared Instrument on JWST. The debris system is remarkably symmetric, smooth, and centered accurately on the star. There is a broad Kuiper-belt-analog ring at ∼80-170 au that coincides with the planetesimal belt detected with the Atacama Large Millimeter/submillimeter Array at 1.34 mm. The interior of the broad belt is filled with warm debris that shines most efficiently at mid-infrared, along with a shallow flux dip/gap at 60 au from the star. These qualitative characteristics argue against any Saturn-mass planets orbiting the star outside of about 10 au, assuming the unseen planet would be embedded in the very broad planetesimal disk from a few to hundreds of astronomical units. We find that the distribution of dust detected interior to the broad outer belt is consistent with grains being dragged inward by the Poynting-Robertson effect. Under the drag-dominated disk assumption, tighter constraints can be derived for planets in specific locations; for example, any planet shepherding the inner edge of the outer belt is likely to be less than six Earth masses. The disk surface brightness profile along with the available infrared photometry suggest a disk inner edge near ∼3−5 au, disconnected from the sub-astronomical-unit region that gives rise to the hot near-infrared excess. The gap between the hot, sub-astronomical-unit zone and the inner edge of the warm debris might be shepherded by a modest-mass, Neptune-size planet.
• Sutlieff, B. J., Birkby, J. L., Stone, J. M., Derkink, A., Backs, F., Doelman, D. S., Kenworthy, M. A., Bohn, A. J., Ertel, S., Snik, F., Woodward, C. E., Ilyin, I., Skemer, A. J., Leisenring, J. M., Strassmeier, K. G., Wang, J., Charbonneau, D., & Biller, B. A. (2024). Exploring the directly imaged HD 1160 system through spectroscopic characterization and high-cadence variability monitoring. Monthly Notices of the Royal Astronomical Society, 531(Issue 1). doi:10.1093/mnras/stae1315
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  The time variability and spectra of directly imaged companions provide insight into their physical properties and atmospheric dynamics. We present follow-up R ∼40 spectrophotometric monitoring of red companion HD 1160 B at 2.8-4.2 μm using the double-grating 360° vector Apodizing Phase Plate (dgvAPP360) coronagraph and ALES integral field spectrograph on the Large Binocular Telescope Interferometer. We use the recently developed technique of gvAPP-enabled differential spectrophotometry to produce differential light curves for HD 1160 B. We reproduce the previously reported ∼3.2 h periodic variability in archival data, but detect no periodic variability in new observations taken the following night with a similar 3.5 per cent level precision, suggesting rapid evolution in the variability of HD 1160 B. We also extract complementary spectra of HD 1160 B for each night. The two are mostly consistent, but the companion appears fainter on the second night between 3.0-3.2 μm. Fitting models to these spectra produces different values for physical properties depending on the night considered. We find an effective temperature Teff = K on the first night, consistent with the literature, but a cooler Teff = K on the next. We estimate the mass of HD 1160 B to be 16-81 MJup, depending on its age. We also present R = 50 000 high-resolution optical spectroscopy of host star HD 1160 A obtained simultaneously with the PEPSI spectrograph. We reclassify its spectral type to A1 IV-V and measure its projected rotational velocity = km s-1. We thus highlight that gvAPP-enabled differential spectrophotometry can achieve repeatable few per cent level precision and does not yet reach a systematic noise floor, suggesting greater precision is achievable with additional data or advanced detrending techniques.
• Wagner, K., Leisenring, J., Cugno, G., Mullin, C., Dong, R., Wolff, S., Greene, T., Johnstone, D., Meyer, M., Beichman, C., Boyer, M., Horner, S., Hodapp, K., Kelly, D., McCarthy, D., Roellig, T., Rieke, G., Rieke, M., Sitko, M., , Stansberry, J., et al. (2024). JWST/NIRCam Imaging of Young Stellar Objects. I. Constraints on Planets Exterior to the Spiral Disk Around MWC 758. Astronomical Journal, 167(4). doi:10.3847/1538-3881/ad11d5
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  MWC 758 is a young star hosting a spiral protoplanetary disk. The spirals are likely companion-driven, and two previously identified candidate companions have been identified—one at the end the Southern spiral arm at ∼0.″6, and one interior to the gap at ∼0.″1. With JWST/NIRCam, we provide new images of the disk and constraints on planets exterior to ∼1″. We detect the two-armed spiral disk, a known background star, and a spatially resolved background galaxy, but no clear companions. The candidates that have been reported are at separations that are not probed by our data with sensitivity sufficient to detect them−nevertheless, these observations place new limits on companions down to ∼2 M Jup at ∼150 au and ∼0.5 M Jup at ≳600 au. Owing to the unprecedented sensitivity of JWST and youth of the target, these are among the deepest mass-detection limits yet obtained through direct imaging observations, and provide new insights into the system’s dynamical nature.
• Wolff, S., Rieke, G., Leisenring, J., Su, K., Wilner, D., Ygouf, M., Ballering, N., Gáspár, A., & Matrà, L. (2024). Deep Search for a Scattered Light Dust Halo Around Vega with the Hubble Space Telescope. Astronomical Journal, 168(6). doi:10.3847/1538-3881/ad67cb
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  We present a provisory scattered-light detection of the Vega debris disk using deep Hubble Space Telescope (HST) coronagraphy (PID 16666). At only 7.7 pc, Vega is immensely important in debris disk studies both for its prominence and also because it allows the highest physical resolution among all debris systems relative to temperature zones around the star. We employ the STIS coronagraph's widest wedge position and classical reference differential imaging to achieve among the lowest surface-brightness sensitivities to date (∼4 mJy arcsec-2 ) at wide separations using 32 orbits in Cycle 29. We detect a halo extending from the inner edge of our effective inner working angle at 10 5 out to the photon noise floor at 30' (80-230 au). The face-on orientation of the system and the lack of a perfectly color-matched point-spread function star have posed significant challenges to the reductions, particularly regarding artifacts from the imperfect color matching. However, we find that a halo of small dust grains provides the best explanation for the observed signal. Unlike Fomalhaut (a close twin to Vega in luminosity, distance, and age), there is no clear distinction in scattered light between the parent planetesimal belt observed with the Atacama Large Millimeter/submillimeter Array and the extended dust halo. These HST observations complement JWST GTO Cycle 1 observations of the system with NIRCam and MIRI.
• Ygouf, M., Beichman, C., Llop-Sayson, J., Bryden, G., Leisenring, J., Krist, J., Rieke, M., Rieke, G., Wolff, S., Roellig, T., Su, K., Hainline, K., Hodapp, K., Greene, T., Meyer, M., Kelly, D., Misselt, K., Stansberry, J., Boyer, M., , Johnstone, D., et al. (2024). Searching for Planets Orbiting Fomalhaut with JWST/NIRCam. Astronomical Journal, 167(1). doi:10.3847/1538-3881/ad08c8
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  We report observations with the JWST/NIRCam coronagraph of the Fomalhaut (α PsA) system. This nearby A star hosts a complex debris disk system discovered by the IRAS satellite. Observations in F444W and F356W filters using the round 430R mask achieve a contrast ratio of ∼4 × 10−7 at 1″ and ∼4 × 10−8 outside of 3″. These observations reach a sensitivity limit of 0.7 mag (Vega) color. Whether this object is a background galaxy, brown dwarf, or a Jovian-mass planet in the Fomalhaut system will be determined by an approved Cycle 2 follow-up program. Finally, we set upper limits to any scattered light from the outer ring, placing a weak limit on the dust albedo at F356W and F444W.
• Jorquera, S., Bonnefoy, M., Betti, S., Chauvin, G., Buenzli, E., Perez, L. M., Follette, K. B., Hinz, P. M., Boccaletti, A., Bailey, V., Biller, B., Defr{`ere}, D., Eisner, J., Henning, T., Klahr, H., Leisenring, J., Olofsson, J., Schlieder, J. E., Skemer, A. J., , Skrutskie, M. F., et al. (2022). "Large Binocular Telescope Search for Companions and Substructures in the (Pre)transitional Disk of AB Aurigae". apj, 926(1), 71.
• Spalding, E., Morzinski, K. M., Hinz, P., Males, J., Meyer, M., Quanz, S., Leisenring, J. M., & Power, J. (2022). "High-contrast Imaging with Fizeau Interferometry: the Case of Altair". aj, 163(2), 62.
• Beatty, T., McElwain, M., Kelly, D., Greene, T. P., Leisenring, J. M., Misselt, K. A., Schlawin, E. A., & Rieke, M. J. (2021). JWST Noise Floor. II. Systematic Error Sources in JWST NIRCam Time Series. Astronomical journal, 161, 18. doi:10.3847/1538-3881/abd8d4
• Defr{`ere}, D., Hinz, P. M., Kennedy, G. M., Stone, J., Rigley, J., Ertel, S., Gaspar, A., Bailey, V. P., Hoffmann, W. F., Mennesson, B., Millan-Gabet, R. .., Danchi, W. C., Absil, O., Arbo, P., Beichman, C., Bonavita, M., Brusa, G., Bryden, G., Downey, E. C., , Esposito, S., et al. (2021). The HOSTS Survey: Evidence for an Extended Dust Disk and Constraints on the Presence of Giant Planets in the Habitable Zone of beta Leo. aj, 161(4), 186.
• Schlawin, E., Leisenring, J. M., McElwain, M. W., Misselt, K., Don, K., Greene, T. P., Beatty, T., Nikolov, N., Kelly, D., & Rieke, M. (2021). "JWST Noise Floor. II. Systematic Error Sources in JWST NIRCam Time Series". aj, 161(3), 115.
• de Kleer, K., Skrutskie, M., Leisenring, J. M., Davies, A. G., Conrad, A. l., Pater, I., Resnick, A., Bailey, V. P., Defr{`ere}, D., Hinz, P., Skemer, A., Spalding, E., Vaz, A., Veillet, C., & Woodward, C. E. (2021). "Resolving Io's Volcanoes from a Mutual Event Observation at the Large Binocular Telescope". psj, 2(6), 227. doi:10.3847/PSJ/ac28fe
• Beichman, C., Ygouf, M., Llop, S. J., Mawet, D., Yung, Y., Choquet, E., Kervella, P., Boccaletti, A., Belikov, R., Lissauer, J. J., Quarles, B., Lagage, P., Dicken, D., Hu, R., Mennesson, B., Ressler, M., Serabyn, E., Krist, J., Bendek, E., , Leisenring, J., et al. (2020). Searching for Planets Orbiting alpha Cen A with the James Webb Space Telescope. PASP, 132(1007), 015002.
• Ertel, S., Defr{`ere}, D., Hinz, P., Mennesson, B., Kennedy, G., Danchi, W., Gelino, C., Hill, J., Hoffmann, W., Mazoyer, J., Rieke, G., Shannon, A., Stapelfeldt, K., Spalding, E., Stone, J., Vaz, A., Weinberger, A., Willems, P., Absil, O., , Arbo, P., et al. (2020). "The HOSTS Survey for Exozodiacal Dust: Observational Results from the Complete Survey". Astronomical Journal, 159(4), 177.
• Schlawin, E., Leisenring, J., Misselt, K., Greene, T. P., McElwain, M. W., Beatty, T., & Rieke, M. (2020). "JWST Noise Floor. I. Random Error Sources in JWST NIRCam Time Series". Astronomical Journal, 160(5), 231.
• Stone, J. M., Barman, T., Skemer, A. J., Briesemeister, Z. W., Brock, L. S., Hinz, P. M., Leisenring, J. M., Woodward, C. E., Skrutskie, M. F., & Spalding, E. (2020). High-contrast Thermal Infrared Spectroscopy with ALES: The 3-4 um Spectrum of kappa Andromedae b. Astronomical Journal, 160(6), 262.
• Borgniet, S., Perraut, K., Su, K., Bonnefoy, M., Delorme, P., Lagrange, A. -., Bailey, V., Buenzli, E., Defr{`ere}, D., Henning, T., Hinz, P., Leisenring, J., Meunier, N., Mourard, D., Nardetto, N., Skemer, A., & Spalding, E. (2019). "Constraints on HD 113337 fundamental parameters and planetary system. Combining long-base visible interferometry, disc imaging, and high-contrast imaging". aap, 627, A44.
• Briesemeister, Z. W., Skemer, A. J., Stone, J. M., Barman, T. S., Hinz, P., Leisenring, J., Skrutskie, M. F., Woodward, C. E., & Spalding, E. (2019). "High Spatial Resolution Thermal Infrared Spectroscopy with ALES: Resolved Spectra of the Benchmark Brown Dwarf Binary HD 130948BC". aj, 157(6), 244.
• Burke, C. J., Peterson, J. R., Egami, E., Leisenring, J. M., Sembroski, G. H., & Rieke, M. J. (2019). "PhoSim-NIRCam: photon-by-photon image simulations of the James Webb Space Telescope's near-infrared camera". Journal of Astronomical Telescopes, Instruments, and Systems, 5, 038002.
• Gaspar, A., Apai, D., Augereau, J., Ballering, N. P., Beichman, C. A., Boccaletti, A., Booth, M., Bowler, B. P., Bryden, G., Chen, C. H., Currie, T., Danchi, W. C., Debes, J., Defr{`ere}, D., Ertel, S., Jackson, A. P., Kalas, P. G., Kennedy, G. M., Kenworthy, M. A., , Kim, J. S., et al. (2019). "Modeling Debris Disk Evolution". baas, 51(3), 69.
• Wagner, K., Stone, J. M., Spalding, E., Apai, D., Dong, R., Ertel, S., Leisenring, J., & Webster, R. (2019). "Thermal Infrared Imaging of MWC 758 with the Large Binocular Telescope: Planetary-driven Spiral Arms?". apj, 882(1), 20.
• Ertel, S., Defr{`ere}, D., Hinz, P., Mennesson, B., Kennedy, G., Danchi, W., Gelino, C., Hill, J., Hoffmann, W., Rieke, G., Shannon, A., Spalding, E., Stone, J., Vaz, A., Weinberger, A., Willems, P., Absil, O., Arbo, P., Bailey, V., , Beichman, C., et al. (2018). "The HOSTS Survey{textemdashExozodiacal Dust Measurements for 30 Stars}". aj, 155(5), 194.
• Meshkat, T., Nilsson, R., Aguilar, J., Vasisht, G., Oppenheimer, R., Su, K. Y., Cady, E., Lockhart, T., Matthews, C., Dekany, R., Leisenring, J., Ygouf, M., Mawet, D., Pueyo, L., & Beichman, C. (2018). "A Deep Search for Planets in the Inner 15 au around Vega". aj, 156(5), 214.
• Stone, J. M., Skemer, A. J., Hinz, P. M., Bonavita, M., Kratter, K. M., Maire, A., Defrere, D., Bailey, V. P., Spalding, E., Leisenring, J. M., Desidera, S., Bonnefoy, M., Biller, B., Woodward, C. E., Henning, T., Skrutskie, M. F., Eisner, J., Crepp, J. R., Patience, J., , Weigelt, G., et al. (2018). "The LEECH Exoplanet Imaging Survey: Limits on Planet Occurrence Rates under Conservative Assumptions". aj, 156(6), 286.
• Greene, T. P., Kelly, D. M., Stansberry, J., Leisenring, J., Egami, E., Schlawin, E., Chu, L., Hodapp, K. W., & Rieke, M. (2017). "{ensuremath{lambda} = 2.4 to 5 ensuremath{mu}m spectroscopy with the James Webb Space Telescope NIRCam instrument}". Journal of Astronomical Telescopes, Instruments, and Systems, 3, 035001.
• Kleer, K., Skrutskie, M., Leisenring, J., Davies, A., Conrad, A., Pater, I., Resnick, A., Bailey, V., Defr{`ere}, D., Hinz, P., Skemer, A., Spalding, E., Vaz, A., Veillet, C., & Woodward, C. (2017). "Multi-phase volcanic resurfacing at Loki Patera on Io". nat, 545(7653), 199-202.
• Schlawin, E., Rieke, M., Leisenring, J., Walker, L., Fraine, J., Kelly, D., Misselt, K., Greene, T., Line, M., Lewis, N., & Stansberry, J. (2017). "Two NIRCam Channels are Better than One: How JWST Can Do More Science with NIRCam{textquoterights Short-wavelength Dispersed Hartmann Sensor}". pasp, 129(971), 015001.
• Defr{`ere}, D., Hinz, P., Mennesson, B., Hoffmann, W., Millan-Gabet, R. .., Skemer, A., Bailey, V., Danchi, W., Downey, E., Durney, O., Grenz, P., Hill, J., McMahon, T., Montoya, M., Spalding, E., Vaz, A., Absil, O., Arbo, P., Bailey, H., , Brusa, G., et al. (2016). "Nulling Data Reduction and On-sky Performance of the Large Binocular Telescope Interferometer". apj, 824(2), 66.
• Schlieder, J. E., Skemer, A. J., Maire, A., Desidera, S., Hinz, P., Skrutskie, M. F., Leisenring, J., Bailey, V., Defr{`ere}, D., Esposito, S., Strassmeier, K. G., Weber, M., Biller, B. A., Bonnefoy, M., Buenzli, E., Close, L. M., Crepp, J. R., Eisner, J. A., Hofmann, K., , Henning, T., et al. (2016). "The LEECH Exoplanet Imaging Survey: Orbit and Component Masses of the Intermediate-Age, Late-Type Binary NO UMa". apj, 818(1), 1.
• Skemer, A. J., Morley, C. V., Zimmerman, N. T., Skrutskie, M. F., Leisenring, J., Buenzli, E., Bonnefoy, M., Bailey, V., Hinz, P., Defr{'ere}, D., Esposito, S., Apai, D., Biller, B., Brandner, W., Close, L., Crepp, J. R., De, R., Desidera, S., Eisner, J., , Fortney, J., et al. (2016). "The LEECH Exoplanet Imaging Survey: Characterization of the Coldest Directly Imaged Exoplanet, GJ 504 b, and Evidence for Superstellar Metallicity". apj, 817(2), 166.
• Conrad, A., Kleer, K., Leisenring, J., La, C. A., Arcidiacono, C., Bertero, M., Boccacci, P., Defr{`ere}, D., Pater, I., Hinz, P., Hofmann, K., K{"urster}, M., Rathbun, J., Schertl, D., Skemer, A., Skrutskie, M., Spencer, J., Veillet, C., Weigelt, G., & Woodward, C. E. (2015). "Spatially Resolved M-band Emission from Io's Loki Patera-Fizeau Imaging at the 22.8 m LBT". aj, 149(5), 175.
• Defr{`ere}, D., Hinz, P., Downey, E., Ashby, D., Bailey, V., Brusa, G., Christou, J., Danchi, W., Grenz, P., Hill, J., Hoffmann, W., Leisenring, J., Lozi, J., McMahon, T., Mennesson, B., Millan-Gabet, R. .., Montoya, M., Powell, K., Skemer, A., , Vaitheeswaran, V., et al. (2015). "Co-phasing the Large Binocular Telescope: status and performance of LBTI/PHASECam". arXiv e-prints, arXiv:1501.04142.
• Defr{`ere}, D., Hinz, P., Skemer, A., Kennedy, G., Bailey, V., Hoffmann, W., Mennesson, B., Millan-Gabet, R. .., Danchi, W., Absil, O., Arbo, P., Beichman, C., Brusa, G., Bryden, G., Downey, E., Durney, O., Esposito, S., Gaspar, A., Grenz, P., , Haniff, C., et al. (2015). "First-light LBT Nulling Interferometric Observations: Warm Exozodiacal Dust Resolved within a Few AU of {ensuremath{eta} Crv}". apj, 799(1), 42.
• Maire, A. -., Skemer, A., Hinz, P., Desidera, S., Esposito, S., Gratton, R., Marzari, F., Skrutskie, M., Biller, B., Defr{`ere}, D., Bailey, V., Leisenring, J., Apai, D., Bonnefoy, M., Brandner, W., Buenzli, E., Claudi, R., Close, L., Crepp, J., , De, R. R., et al. (2015). "The LEECH Exoplanet Imaging Survey. Further constraints on the planet architecture of the HR 8799 system (Corrigendum)". aap, 579, C2.
• Maire, A. -., Skemer, A., Hinz, P., Desidera, S., Esposito, S., Gratton, R., Marzari, F., Skrutskie, M., Biller, B., Defr{`ere}, D., Bailey, V., Leisenring, J., Apai, D., Bonnefoy, M., Brandner, W., Buenzli, E., Claudi, R., Close, L., Crepp, J., , De, R. R., et al. (2015). "The LEECH Exoplanet Imaging Survey. Further constraints on the planet architecture of the HR 8799 system". aap, 576, A133.
• Testi, L., Skemer, A., Henning, T., Bailey, V., Defr{`ere}, D., Hinz, P., Leisenring, J., Vaz, A., Esposito, S., Fontana, A., Marconi, A., Skrutskie, M., & Veillet, C. (2015). "Hunting for Planets in the HL Tau Disk". apjl, 812(2), L38.
• Thalmann, C., Mulders, G., Janson, M., Olofsson, J., Benisty, M., Avenhaus, H., Quanz, S., Schmid, H., Henning, T., Buenzli, E., M{'enard}, F., Carson, J., Garufi, A., Messina, S., Dominik, C., Leisenring, J., Chauvin, G., & Meyer, M. (2015). "Optical Imaging Polarimetry of the LkCa 15 Protoplanetary Disk with SPHERE ZIMPOL". apjl, 808(2), L41.
• Matthews, C. T., Crepp, J. R., Skemer, A., Hinz, P. M., Gianninas, A., Kilic, M., Skrutskie, M., Bailey, V. P., Defrere, D., Leisenring, J., Esposito, S., & Puglisi, A. (2014). "Mid-infrared High-contrast Imaging of HD 114174 B: An Apparent Age Discrepancy in a ``Sirius-like'' Binary System". apjl, 783(2), L25.
• Rodigas, T. J., Debes, J. H., Hinz, P. M., Mamajek, E. E., Pecaut, M. J., Currie, T., Bailey, V., Defrere, D., De, R., Hill, J. M., Leisenring, J., Schneider, G., Skemer, A. J., Skrutskie, M., Vaitheeswaran, V., & Ward-Duong, K. (2014). "Does the Debris Disk around HD 32297 Contain Cometary Grains?". apj, 783(1), 21.
• Schlieder, J. E., Bonnefoy, M., Herbst, T., L{'epine}, S., Berger, E., Henning, T., Skemer, A., Chauvin, G., Rice, E., Biller, B., Girard, J. H., Lagrange, A., Hinz, P., Defr{`ere}, D., Bergfors, C., Brandner, W., Lacour, S., Skrutskie, M., & Leisenring, J. (2014). "Characterization of the Benchmark Binary NLTT 33370". apj, 783(1), 27.
• Skemer, A. J., Marley, M. S., Hinz, P. M., Morzinski, K. M., Skrutskie, M. F., Leisenring, J. M., Close, L. M., Saumon, D., Bailey, V. P., Briguglio, R., Defrere, D., Esposito, S., Follette, K. B., Hill, J. M., Males, J. R., Puglisi, A., Rodigas, T. J., & Xompero, M. (2014). "Directly Imaged L-T Transition Exoplanets in the Mid-infrared". apj, 792(1), 17.
• Thalmann, C., Mulders, G., Hodapp, K., Janson, M., Grady, C., Min, M., Juan Ovelar, M., Carson, J., Brandt, T., Bonnefoy, M., McElwain, M., Leisenring, J., Dominik, C., Henning, T., & Tamura, M. (2014). "The architecture of the LkCa 15 transitional disk revealed by high-contrast imaging". aap, 566, A51.
• Bailey, V., Hinz, P. M., Currie, T., Su, K. Y., Esposito, S., Hill, J. M., Hoffmann, W. F., Jones, T., Kim, J., Leisenring, J., Meyer, M., Murray-Clay, R., Nelson, M. J., Pinna, E., Puglisi, A., Rieke, G., Rodigas, T., Skemer, A., Skrutskie, M. F., , Vaitheeswaran, V., et al. (2013). "A Thermal Infrared Imaging Study of Very Low Mass, Wide-separation Brown Dwarf Companions to Upper Scorpius Stars: Constraining Circumstellar Environments". apj, 767(1), 31.
• Shenoy, D. P., Jones, T. J., Humphreys, R. M., Marengo, M., Leisenring, J. M., Nelson, M. J., Wilson, J. C., Skrutskie, M. F., Hinz, P. M., Hoffmann, W. F., Bailey, V., Skemer, A., Rodigas, T., & Vaitheeswaran, V. (2013). "Adaptive Optics Imaging of VY Canis Majoris at 2-5 {ensuremath{mu}m with LBT/LMIRCam}". aj, 146(4), 90.
• Rodigas, T. J., Hinz, P. M., Leisenring, J., Vaitheeswaran, V., Skemer, A. J., Skrutskie, M., Su, K. Y., Bailey, V., Schneider, G., Close, L., Mannucci, F., Esposito, S., Arcidiacono, C., Pinna, E., Argomedo, J., Agapito, G., Apai, D., Bono, G., Boutsia, K., , Briguglio, R., et al. (2012). "The Gray Needle: Large Grains in the HD 15115 Debris Disk from LBT/PISCES/Ks and LBTI/LMIRcam/L' Adaptive Optics Imaging". apj, 752(1), 57.
• Skemer, A. J., Hinz, P. M., Esposito, S., Burrows, A., Leisenring, J., Skrutskie, M., Desidera, S., Mesa, D., Arcidiacono, C., Mannucci, F., Rodigas, T. J., Close, L., McCarthy, D., Kulesa, C., Agapito, G., Apai, D., Argomedo, J., Bailey, V., Boutsia, K., , Briguglio, R., et al. (2012). "First Light LBT AO Images of HR 8799 bcde at 1.6 and 3.3 {ensuremath{mu}m: New Discrepancies between Young Planets and Old Brown Dwarfs}". apj, 753(1), 14.
• Eisenstein, D. J., Weinberg, D. H., Agol, E., Aihara, H., Allende, P. C., Anderson, S. F., Arns, J. A., Aubourg, '., Bailey, S., Balbinot, E., Barkhouser, R., Beers, T. C., Berlind, A. A., Bickerton, S. J., Bizyaev, D., Blanton, M. R., Bochanski, J. J., Bolton, A. S., Bosman, C. T., , Bovy, J. o., et al. (2011). "SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way, and Extra-Solar Planetary Systems". aj, 142(3), 72.
• Woods, P. M., Oliveira, J., Kemper, F., Loon, J. T., Sargent, B., Matsuura, M., Szczerba, R., Volk, K., Zijlstra, A., Sloan, G., Lagadec, E., McDonald, I., Jones, O., Gorjian, V., Kraemer, K., Gielen, C., Meixner, M., Blum, R., Sewi{lo}, M., , Riebel, D., et al. (2011). "The SAGE-Spec Spitzer Legacy programme: the life-cycle of dust and gas in the Large Magellanic Cloud - Point source classification I". mnras, 411(3), 1597-1627.
• Fox, O. D., Chevalier, R. A., Dwek, E., Skrutskie, M. F., Sugerman, B. E., & Leisenring, J. M. (2010). "Disentangling the Origin and Heating Mechanism of Supernova Dust: Late-time Spitzer Spectroscopy of the Type IIn SN 2005ip". apj, 725(2), 1768-1778.
• Kemper, F., Woods, P. M., Antoniou, V., Bernard, J. -., Blum, R., Boyer, M., Chan, J., Chen, C. -., Cohen, M., Dijkstra, C., Engelbracht, C., Galametz, M., Galliano, F., Gielen, C., Gordon, K. D., Gorjian, V., Harris, J., Hony, S., Hora, J., , Indebetouw, R., et al. (2010). "The SAGE-Spec Spitzer Legacy Program: The Life Cycle of Dust and Gas in the Large Magellanic Cloud". pasp, 122(892), 683.
• Bary, J. S., Leisenring, J. M., & Skrutskie, M. F. (2009). "Variations of the 10 {ensuremath{mu}m Silicate Features in the Actively Accreting T Tauri Stars: DG Tau and XZ Tau}". apjl, 706(1), L168-L172.
• Watson, D. M., Leisenring, J. M., Furlan, E., Bohac, C., Sargent, B., Forrest, W., Calvet, N., Hartmann, L., Nordhaus, J. T., Green, J. D., Kim, K., Sloan, G., Chen, C., Keller, L., d'Alessio, P., Najita, J., Uchida, K. I., & Houck, J. (2009). "Crystalline Silicates and Dust Processing in the Protoplanetary Disks of the Taurus Young Cluster". apjs, 180(1), 84-101.
• Bary, J. S., Weintraub, D. A., Shukla, S. J., Leisenring, J. M., & Kastner, J. H. (2008). "Quiescent H$_{2$ Emission From Pre-Main-Sequence Stars in Chamaeleon I}". apj, 678(2), 1088-1098.
• Leisenring, J., Kemper, F., & Sloan, G. (2008). "Effects of Metallicity on the Chemical Composition of Carbon Stars". apj, 681(2), 1557-1573.
• Speck, A. K., Cami, J., Markwick-Kemper, C., Leisenring, J., Szczerba, R., Dijkstra, C., Van, D. S., & Meixner, M. (2006). "The Unusual Spitzer Spectrum of the Carbon Star IRAS 04496-6958: A Different Condensation Sequence in the LMC?". apj, 650(2), 892-900.

Proceedings Publications

• Barbato, D., Farinato, J., Baruffolo, A., Bergomi, M., Bianco, A., Biondi, F., Briegel, F., Carolo, E., Cerpelloni, P., Carlotti, A., Chinellato, S., Conrad, A., De Pascale, M., Di Filippo, S., Dima, M., D'Orazi, V., Ertel, S., Machado, T., Greggio, D., , Guerra, J., et al. (2024). SHARK-NIR commissioning and early science runs. In Ground-Based and Airborne Instrumentation for Astronomy X 2024, 13096.
  More info

  SHARK-NIR is an instrument providing high-contrast coronagraphic imaging, dual band imaging and low resolution spectroscopy in Y, J and H bands, taking advantage of the high performance of the Large Binocular Telescope (LBT) AO systems. Its main scientific drivers is the detection and characterization of exoplanets, circumstellar disks, Solar System small bodies and acrive galactic nuclei. Binocular observations are provided by exploiting the synergy with SHARK-VIS (operating in V band) and LMIRCam of LBTI (operating from K to M band). SHARK-NIR was shipped to LBT in June 2022, and up to November 2022 was the subject of the three pre-commissioning runs: the first to install and test the instrument in the high-bay LBT clean tent, the second to install and align the instrument to the telescope and the third to perform daytime testing. This pre-commissioning phase resulted in the successful alignment of the instrument with a very good internal optical quality and the performance of additional tests using simulated turbulence injected through LBT Adaptive Secondary Mirror. In January 2023 we had the first commissioning run and the instrument first light, in which we successfully tested the imaging capabilities with and without the Gaussian Lyot coronagraph. In March 2023 we had the second commissioning run, in which despite the bad weather we successfully performed a variety of technical activities, as well as preliminary testing of the Shaped Pupil coronagraph. After two additional commissioning runs in May and October, our first early scientific run in October 2023 focused on the Taurus star formation region, a region populated by targets of considerable scientific interest. In this paper we will give an overview of commissioning and the early science phases running from October 2023 to May 2024, focusing on the technical challenges we overcame and future work needed to push the instrument to its very limit, as well as presenting the first preliminary scientific results.
• Bowens, R., Meyer, M., Tobin, T., Viges, E., Hart, D., Monnier, J., Leisenring, J., Ives, D., & van Boekel, R. (2024). Characterization of a Longwave HgCdTe GeoSnap Detector. In X-Ray, Optical, and Infrared Detectors for Astronomy XI 2024, 13103.
  More info

  New longwave HgCdTe detectors are critical to upcoming plans for ground-based infrared astronomy. These detectors, with fast-readouts and deep well-depths, will be key components of extremely large telescope instruments and therefore must be well understood prior to deployment. We analyze one such HgCdTe detector, a Teledyne Imaging Sensors GeoSnap, at the University of Michigan. We find that the properties of the GeoSnap are consistent with expectations from analysis of past devices. The GeoSnap has a well-depth of 2.75 million electrons per pixel, a read noise of 360 e-/pix, and a dark current of 330, 000 e-/s/pix at 45 K. The device experiences 1/f noise which can be mitigated relative to half-well shot noise with modest frequency image differencing. The GeoSnap’s quantum efficiency is calculated to be 79.7 ± 8.3 % at 10.6 microns. Although the GeoSnap’s bad pixel fraction, on the order of 3%, is consistent with other GeoSnap devices, close to a third of the bad pixels in this detector are clustered in a series of 31”leopard” spots spread across the detector plane. We report these properties and identify additional analyses that will be performed on future GeoSnap detectors.
• Isbell, J., Ertel, S., Wagner, K., Rousseau, H., Power, J., Carlson, J., Becker, A., Rupert, J., Hinz, P., Hoffmann, W., Leisenring, J., Stone, J., & Spalding, E. (2024). The LBTI - Pioneering the ELT Era. In Optical and Infrared Interferometry and Imaging IX 2024, 13095.
  More info

  The Large Binocular Telescope Interferometer (LBTI) is a strategic instrument which combines the two 8.4m apertures of the LBT for sensitive, high-angular-resolution imaging and interferometric observations in the thermal infrared. Through its observing modes utilizing adaptive optics, Fizeau imaging, and nulling interferometry, the LBTI is in many respects the first ELT; it serves as a pioneer for upcoming ELTs in terms of both science and instrumentation. LBTI has completed a large survey for habitable-zone dust around main sequence stars, exploiting its angular resolution to obtain 100x better sensitivity than space-based photometric observations. Recently we have emphasized Fizeau imaging, supporting high-contrast and precision-astrometric observations. We obtained the first extragalactic and N band observations in this mode, demonstrating high-fidelity, high-sensitivity imaging on a 23 m baseline. We are now pushing to image the first rocky planet in the habitable zone around a nearby Sun-like star. In this paper we present an overview of the LBTI's design and capabilities as a 23 m telescope. In particular, we focus on open loop Fizeau imaging, presenting the state of the art. We measure the stability of the Fizeau PSF, test frame selection criteria, and demonstrate PSF deconvolution. Finally, we outline future developments and synergies with current and upcoming facilities.
• Johnson, J., Vaz, A., Montoya, M., Morzinski, K., Patience, J., Sivanandam, S., Brusa, G., Durney, O., Gardner, A., Guyon, O., Harrison, L., Jones, R., Leisenring, J., Males, J., Payan, B., Perez, L., Rotman, Y., Taylor, J., Vargas, D., & West, G. (2024). Tuning the MAPS adaptive secondary mirror: actuator control, PID tuning, power spectra, and failure diagnosis. In Unconventional Imaging, Sensing, and Adaptive Optics 2024, 13149.
  More info

  The MMT Adaptive optics exoPlanet characterization System (MAPS) is currently in its engineering phase, operating on sky at the MMT Telescope. The MAPS Adaptive Secondary Mirror's actuators are controlled by a closed loop modified P ID c ontrol l aw a nd a n o pen l oop f eed f orward l aw, w hich i n c ombination a llows for faster actuator response time. An essential element of achieving the secondary's performance goals involves the process of PID gain tuning. To start, we briefly discuss the design of the MAPS ASM and its a ctuators. We then describe the actuator positional control system and control law. Next, we discuss a few of the issues that make ASM tuning difficult. We then outline our initial attempts at tuning the actuator controllers, and discuss the use of actuator positional power spectra for both tuning and determining the health and failure states of individual actuators. We conclude by presenting the results of our latest round of tuning configuration t rials, w hich have been successful at decreasing mirror latency, increasing operational mirror modes and improving image PSF.
• Laugier, R., Martinod, M., Garreau, G., Missiaen, K., Salman, M., Raskin, G., Dandumont, C., Ertel, S., Ireland, M., Kraus, S., Labadie, L., Mazzoli, A., Medgyesi, G., Sanny, A., Absil, O., Berger, J., Bonduelle, M., Bigioli, A., Bouzerand, E., , Carter, J., et al. (2024). L-band nulling interferometry at the VLTI with Asgard/NOTT: status and plans. In Optical and Infrared Interferometry and Imaging IX 2024, 13095.
  More info

  NOTT (formerly Hi-5) is the L'-band (3.5-4.0 µm) nulling interferometer of Asgard, an instrument suite in preparation for the VLTI visitor focus. The primary scientific objectives of NOTT include characterizing (i) young planetary systems near the snow line, a critical region for giant planet formation, and (ii) nearby main-sequence stars close to the habitable zone, with a focus on detecting exozodiacal dust that could obscure Earth-like planets. In 2023-2024, the final warm optics have been procured and assembled in a new laboratory at KU Leuven. First fringes and null measurements were obtained using a Gallium Lanthanum Sulfide (GLS) photonic chip that was also tested at cryogenic temperatures. In this paper, we present an overall update of the NOTT project with a particular focus on the cold mechanical design, the first results in the laboratory with the final NOTT warm optics, and the ongoing Asgard integration activities. We also report on other ongoing activities such as the characterization of the photonic chip (GLS, LiNbO3, SiO), the development of the exoplanet science case, the design of the dispersion control module, and the progress with the self-calibration data reduction software.
• Carter, A. L., Skemer, A. J., Danielski, C., Leisenring, J. M., Wang, J. J., Van Gorkom, K., York, B., Adams, J., Biller, B., Girard, J. H., Hinkley, S., Nickson, B., Perrin, M., & Pueyo, L. (2021, September). "Simulating JWST high contrast observations with PanCAKE". In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 11823.
• Schlawin, E., Leisenring, J., Misselt, K., Don, K., McElwain, M. W., Greene, T. P., Beatty, T., Nikolov, N., Kelly, D., & Rieke, M. (2021, jan). "The JWST Noise Floor - Estimates for NIRCam Time series". In American Astronomical Society Meeting Abstracts, 53.
• Wagner, K., Ertel, S., Stone, J., Leisenring, J. M., Apai, D., Kasper, M., Absil, O., Close, L., Defr{`ere}, D., Guyon, O., & Males, J. (2021, September). "Imaging low-mass planets within the habitable zones of nearby stars with ground-based mid-infrared imaging". In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 11823.
• Ygouf, M., Beichman, C. A., Rocha, G. M., Green, J. J., Jewell, J. B., Roudier, G. M., Greenbaum, A., Leisenring, J. M., Girard, J., Pueyo, L., Perrin, M., Meyer, M., De Furio, M., & Uyama, T. (2021, September). "Realizing the Potential of JWST High Contrast Imaging with Coronagraphic Phase-Retrieval". In European Planetary Science Congress.
• Bowens, R., Viges, E., Meyer, M., Atkinson, D., Monnier, J., Morgenstern, M., Leisenring, J., & Hoffmann, W. (2020, dec). "The Michigan infrared test thermal ELT N-band (MITTEN) cryostat". In SPIE, 11447.
• Ertel, S., Hinz, P. M., Stone, J. M., Vaz, A., Montoya, O. M., West, G. S., Durney, O., Grenz, P., Spalding, E. A., Leisenring, J., Wagner, K., Anugu, N., Power, J., Maier, E. R., Defr{`ere}, D., Hoffmann, W., Perera, S., Brown, S., Skemer, A. J., , Mennesson, B., et al. (2020, dec). Overview and prospects of the LBTI beyond the completed HOSTS survey. In SPIE, 11446.
• Gaspar}, A., Rieke, M., Rieke, G., Leisenring, J., Ygouf, M., Beichman, C., Group, J. N., & Group, {. G. (2020, jan). The JWST Debris Disk Spatially Resolved Imaging GTO Programs. In AAS, 235.
• Marafatto, L., Bergomi, M., Biondi, F., Carolo, E., De, P. M., Greggio, D., Lessio, L., Mesa, D., Radhakrishnan, S., Umbriaco, G., Vassallo, D., Viotto, V., Bianco, A., Dima, M., D'Orazi, V., Grenz, P., Leisenring, J. M., Mohr, L., Montoya, M., , Zanutta, A., et al. (2020, dec). "SHARK-NIR, toward the installation at the Large Binocular Telescope". In SPIE, 11448.
• Meyer, M., Leisenring, J., Hoffmann, W., Atkinson, D., Morzinski, K., & Bowens, R. (2020, jan). AO-assisted Ground-based Mid-Infrared Imaging in the JWST Era: MIRAC-5 with Geosnap. In AAS, 235.
• Ygouf, M., Rocha, G., Beichman, C., Greenbaum, A., Leisenring, J., De, F. M., Meyer, M., Girard, J., Pueyo, L. A., Perrin, M., Uyama, T., Green, J. J., & Jewell, J. B. (2020, dec). Data processing for high-contrast imaging with the James Webb Space Telescope. In SPIE, 11443.
• Moravec, E., Czekala, I., Follette, K., Alpasian, M., Amon, A., Armentrout, W., Arney, G., Barron, D., Bellm, E., Bender, A., Bridge, J., Colon, K., Czekala, I., Datta, R., DeRoo, C., Feng, W., Florian, M., Follette, K., Gabriel, T., , Hall, K., et al. (2019, sep). "The Early Career Perspective on the Coming Decade, Astrophysics Career Paths, and the Decadal Survey Process". In Bulletin of the American Astronomical Society, 51.
• Rieke, M., Leisenring, J., & Misselt, K. (2019, jan). "Summary of JWST NIRCam Latent Image Behavior". In American Astronomical Society Meeting Abstracts #233, 233.
• Schlawin, E., Misselt, K., Greene, T., Leisenring, J., Beatty, T., & Rieke, M. (2019, aug). "Lessons Learned for JWST Transiting Planet Time Series from Ground-based Studies of the NIRCam Detectors and Control Electronics". In AAS/Division for Extreme Solar Systems Abstracts, 51.
• Briesemeister, Z., Skemer, A. J., Stone, J. M., Stelter, R. D., Hinz, P., Leisenring, J., Skrutskie, M. F., Woodward, C. E., & Barman, T. (2018, jul). "MEAD: data reduction pipeline for ALES integral field spectrograph and LBTI thermal infrared calibration unit". In Ground-based and Airborne Instrumentation for Astronomy VII, 10702.
• Ertel, S., Kennedy, G., Defr{`ere}, D., Hinz, P., Shannon, A., Mennesson, B., Danchi, W., Gelino, C., Hill, J., Hoffman, W., Rieke, G., Spalding, E., Stone, J., Vaz, A., Weinberger, A., Willems, P., Absil, O., Arbo, P., Bailey, V., , Beichman, C., et al. (2018, jul). "The HOSTS survey for exo-zodiacal dust: preliminary results and future prospects". In Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 10698.
• Girard, J. H., Blair, W., Brooks, B., Brooks, K., Brown, R., Bushouse, H., Canipe, A., Chen, C., Correnti, M., Hagan, J. B., Hilbert, B., Hines, D., Leisenring, J., Long, J., Nickson, B., Perrin, M. D., Pontoppidan, K., Pueyo, L., Rajan, A., , Riedel, A., et al. (2018, aug). "Making good use of JWST's coronagraphs: tools and strategies from a user's perspective". In Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 10698.
• Skemer, A. J., Hinz, P., Stone, J., Skrutskie, M., Woodward, C. E., Leisenring, J., & Briesemeister, Z. (2018, jul). "ALES: overview and upgrades". In Ground-based and Airborne Instrumentation for Astronomy VII, 10702.
• Stone, J. M., Skemer, A. J., Hinz, P., Briesemeister, Z., Barman, T., Woodward, C. E., Skrutskie, M., & Leisenring, J. (2018, jul). "On-sky operations with the ALES integral field spectrograph". In Ground-based and Airborne Instrumentation for Astronomy VII, 10702.
• Suri, V., Meyer, M., Greenbaum, A. Z., Bell, C., Beichman, C., Gordon, K. D., Greene, T. P., Hodapp, K., Horner, S., Johnstone, D., Leisenring, J., Manara, C., Mann, R., Misselt, K., Raileanu, R., Rieke, M., & Roellig, T. (2018, jan). "Probing the End of the IMF in NGC 2024 with NIRCam on JWST: Assessing the Impact of Nebular Emission in Galactic Star Forming Regions". In American Astronomical Society Meeting Abstracts #231, 231.
• Schlieder, J. E., Meyer, M., Beichman, C. A., Reggiani, M., Daemgen, S., Leisenring, J., & Ygouf, M. (2017, jun). "A JWST NIRCam Coronagraphic Imaging Survey of Nearby Young M Dwarfs". In American Astronomical Society Meeting Abstracts #230, 230.
• Skrutskie, M. F., Kleer, K. R., Stone, J., Conrad, A. l., Davies, A., Pater, I., Leisenring, J., Hinz, P., Skemer, A., Veillet, C., Woodward, C. E., Ertel, S., & Spalding, E. (2017, oct). "Diffraction-limited Mid-infrared Integral Field Spectroscopy of Io's Volcanic Activity with ALES on the Large Binocular Telescope". In AAS/Division for Planetary Sciences Meeting Abstracts #49, 49.
• Greene, T. P., Chu, L., Egami, E., Hodapp, K. W., Kelly, D. M., Leisenring, J., Rieke, M., Robberto, M., Schlawin, E., & Stansberry, J. (2016, jul). "Slitless spectroscopy with the James Webb Space Telescope Near-Infrared Camera (JWST NIRCam)". In Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 9904.
• Hinz, P., Defr{`ere}, D., Skemer, A., Bailey, V., Stone, J., Spalding, E., Vaz, A., Pinna, E., Puglisi, A., Esposito, S., Montoya, M., Downey, E., Leisenring, J., Durney, O., Hoffmann, W., Hill, J., Millan-Gabet, R. .., Mennesson, B., Danchi, W., , Morzinski, K., et al. (2016, aug). "Overview of LBTI: a multipurpose facility for high spatial resolution observations". In Optical and Infrared Interferometry and Imaging V, 9907.
• Kleer, K. R., Skrutskie, M. F., Leisenring, J., Pater, I., Davies, A., Conrad, A. l., Caleb, R. A., Hinz, P., Defr{`ere}, D., & Veillet, C. (2016, oct). "Time-Evolution and Thermal Mapping of Io's Loki Patera at High Resolution". In AAS/Division for Planetary Sciences Meeting Abstracts #48, 48.
• Kleer, K., Skrutskie, M., Leisenring, J., Davies, A., Resnick, A., Conrad, A., De Pater, I., Hinz, P., Defrere, D., & Veillet, C. (2016, dec). "Resolving Io's Volcanoes from a Mutual Event Observation at the Large Binocular Telescope". In AGU Fall Meeting Abstracts.
• Leisenring, J. M., Rieke, M., Misselt, K., & Robberto, M. (2016, aug). "Characterizing persistence in JWST NIRCam flight detectors". In High Energy, Optical, and Infrared Detectors for Astronomy VII, 9915.
• Rest, A., Hilbert, B., Leisenring, J. M., Misselt, K., Rieke, M., & Robberto, M. (2016, jul). "Gain determination of non-linear IR detectors with the differential photon transfer curve (dPTC) method". In Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 9904.
• Conrad, A., Arcidiacono, C., Bertero, M., Boccacci, P., Davies, A., Defrere, D., Kleer, K., De Pater, I., Hinz, P., Hofmann, K., La Camera, A., Leisenring, J., K{"urster}, M., Rathbun, J., Schertl, D., Skemer, A., Skrutskie, M., Spencer, J., Veillet, C., , Weigelt, G., et al. (2015, dec). "High angular resolution at LBT". In AGU Fall Meeting Abstracts, 2015.
• Conrad, A., Kleer, K., Leisenring, J., La Camera, A., Arcidiacono, C., Bertero, M., Boccacci, P., Defr{`ere}, D., Pater, I., Hinz, P., Hoffman, K. -., K{"urster}, M., Rathbun, J., Schertl, D., Skemer, A., Skrutskie, M., Spencer, J., Veillet, C., Weigelt, G., & Woodward, C. (2015, oct). "High resolution LBT imaging of Io and Jupiter". In European Planetary Science Congress.
• Defr{`ere}, D., Hinz, P., Skemer, A., Bailey, V., Downey, E., Durney, O., Eisner, J., Hill, J., Hoffmann, W., Leisenring, J., McMahon, T., Montoya, M., Spalding, E., Stone, J., Vaz, A., Absil, O., Esposito, S., Kenworthy, M., Mennesson, B., , Millan-Gabet, R. .., et al. (2015, sep). "Exoplanet science with the LBTI: instrument status and plans". In Techniques and Instrumentation for Detection of Exoplanets VII, 9605.
• Skemer, A. J., Hinz, P., Montoya, M., Skrutskie, M. F., Leisenring, J., Durney, O., Woodward, C. E., Wilson, J., Nelson, M., Bailey, V., Defrere, D., & Stone, J. (2015, sep). "First light with ALES: A 2-5 micron adaptive optics Integral Field Spectrograph for the LBT". In Techniques and Instrumentation for Detection of Exoplanets VII, 9605.
• Skrutskie, M. F., Conrad, A., Resnick, A., Leisenring, J., Hinz, P., Pater, I., Kleer, K., Spencer, J., Skemer, A., Woodward, C. E., Davies, A. G., & Defr{'ere}, D. (2015, nov). "Large Binocular Telescope Observations of Europa Occulting Io's Volcanoes at 4.8 {ensuremath{mu}m}". In AAS/Division for Planetary Sciences Meeting Abstracts #47, 47.
• Bailey, V. P., Hinz, P. M., Puglisi, A. T., Esposito, S., Vaitheeswaran, V., Skemer, A. J., Defr{`ere}, D., Vaz, A., & Leisenring, J. M. (2014, jul). "Large binocular telescope interferometer adaptive optics: on-sky performance and lessons learned". In Adaptive Optics Systems IV, 9148.
• Conrad, A. l., Leisenring, J., Kleer, K., Skemer, A., Hinz, P., Skrutskie, M., Veillet, C., Pater, I., Bertero, M., Boccacci, P., Defr{`ere}, D., Hofmann, K., La, C. A., Schertl, D., Spencer, J., Weigelt, G., & Woodward, C. E. (2014, nov). "High Resolution Imaging of Io's Volcanoes with LBTI". In AAS/Division for Planetary Sciences Meeting Abstracts #46, 46.
• Defr{`ere}, D., Absil, O., Hinz, P., Kuhn, J., Mawet, D., Mennesson, B., Skemer, A., Wallace, K., Bailey, V., Downey, E., Delacroix, C., Durney, O., Forsberg, P., Gomez, C., Habraken, S., Hoffmann, W., Karlsson, M., Kenworthy, M., Leisenring, J., , Montoya, M., et al. (2014, jul). "L'-band AGPM vector vortex coronagraph's first light on LBTI/LMIRCam". In Adaptive Optics Systems IV, 9148.
• Defr{`ere}, D., Absil, O., Hinz, P., Mawet, D., Kuhn, J., Mawet, D., Mennesson, B., Skemer, A., Wallace, K., Bailey, V., Downey, E., Delacroix, C., Durney, O., Forsberg, P., Gomez, C., Habraken, S., Karlsson, M., Kenworthy, M., Leisenring, J., , Montoya, M., et al. (2014, mar). "L'-band AGPM vector vortex coronagraph's first light on LBTI/LMIRCAM". In Search for Life Beyond the Solar System. Exoplanets, Biosignatures & Instruments.
• Defr{`ere}, D., Hinz, P., Bryden, G., Danchi, W., Mennesson, B., Millan-Gabet, R. .., Skemer, A., Stapeldfeld, K., Weinberger, A., Wyatt, M., Absil, O., Bailey, V., Beichman, C., Downey, E., Grenz, P., Haniff, C., Hoffmann, W., Kennedy, G., Lebreton, J., , Leisenring, J., et al. (2014, mar). "The Hunt for Observable Signatures of Terrestrial Planetary Systems (HOSTS)". In Search for Life Beyond the Solar System. Exoplanets, Biosignatures & Instruments.
• Defr{`ere}, D., Hinz, P., Downey, E., Ashby, D., Bailey, V., Brusa, G., Christou, J., Danchi, W., Grenz, P., Hill, J., Hoffmann, W., Leisenring, J., Lozi, J., McMahon, T., Mennesson, B., Millan-Gabet, R. .., Montoya, M., Powell, K., Skemer, A., , Vaitheeswaran, V., et al. (2014, jul). "Co-phasing the Large Binocular Telescope: status and performance of LBTI/PHASECam". In Optical and Infrared Interferometry IV, 9146.
• Defr{`ere}, D., Hinz, P., Skemer, A., Arbo, P., Bailey, V., Brusa, G., Connors, T., Downey, E., Durney, O., Eisner, J., Grenz, P., Hoffmann, B., Hill, J., Leisenring, J., McMahon, T., Mennesson, M., Millan-Gabet, R. .., Montoya, M., Nash, M., , Skrutskie, M., et al. (2014, apr). "Update on the LBTI: a versatile high-contrast and high-resolution infrared imager for a 23-m telescope". In Improving the Performances of Current Optical Interferometers & Future Designs.
• Hinz, P., Bailey, V. P., Defr{`ere}, D., Downey, E., Esposito, S., Hill, J., Hoffmann, W. F., Leisenring, J., Montoya, M., McMahon, T., Puglisi, A., Skemer, A., Skrutskie, M., Vaitheeswaran, V., & Vaz, A. (2014, jul). "Commissioning the LBTI for use as a nulling interferometer and coherent imager". In Optical and Infrared Interferometry IV, 9146.
• Hoffmann, W. F., Hinz, P. M., Defr{`ere}, D., Leisenring, J. M., Skemer, A. J., Arbo, P. A., Montoya, M., & Mennesson, B. (2014, jul). "Operation and performance of the mid-infrared camera, NOMIC, on the Large Binocular Telescope". In Ground-based and Airborne Instrumentation for Astronomy V, 9147.
• Leisenring, J., Hinz, P., Skrutskie, M., Skemer, A., Woodward, C., Veillet, C., Arcidiacono, C., Bailey, V., Bertero, M., Boccacci, P., Conrad, A., Kleer, K., Pater, I., Defr{`ere}, D., Hill, J., Hofmann, K. -., Kaltenegger, L., La Camera, A., Nelson, M., , Schertl, D., et al. (2014, jul). "Fizeau interferometric imaging of Io volcanism with LBTI/LMIRcam". In Optical and Infrared Interferometry IV, 9146.
• Skemer, A. J., Hinz, P., Esposito, S., Skrutskie, M. F., Defr{`ere}, D., Bailey, V., Leisenring, J., Apai, D., Biller, B., Bonnefoy, M., Brandner, W., Buenzli, E., Close, L., Crepp, J., De, R., Desidera, S., Eisner, J., Fortney, J., Henning, T., , Hofmann, K., et al. (2014, jul). "High contrast imaging at the LBT: the LEECH exoplanet imaging survey". In Adaptive Optics Systems IV, 9148.
• Skemer, A., Apai, D., Bailey, V., Biller, B., Bonnefoy, M., Brandner, W., Buenzli, E., Close, L., Crepp, J., Defrere, D., Desidera, S., Eisner, J., Esposito, S., Fortney, J., Henning, T., Hinz, P., Hofmann, K., Leisenring, J., Males, J., , Millan-Gabet, R., et al. (2014, jan). "LEECH: A 100 Night Exoplanet Imaging Survey at the LBT". In Exploring the Formation and Evolution of Planetary Systems, 299.
• Skrutskie, M. F., Wilson, J., Nelson, M., Hinz, P., Skemer, A., & Leisenring, J. (2014, nov). "Large Binocular Telescope Adaptive Optics Mid-infrared Spectroscopy of Thermal Radiation from an Eruption near Io's Gish Bar Patera". In AAS/Division for Planetary Sciences Meeting Abstracts #46, 46.
• Zimmerman, N., Skemer, A., Apai, D., Bailey, V., Biller, B., Bonnefoy, M., Brandner, W., Buenzli, E., Close, L., Crepp, J., Defrere, D., Desidera, S., Eisner, J., Esposito, S., Fortney, J., Henning, T., Hinz, P., Hofmann, K., Leisenring, J., , Males, J., et al. (2013, jul). "A 100-Night Exoplanet Imaging Survey at the LBT". In Protostars and Planets VI Posters.
• Hinz, P., Arbo, P., Bailey, V., Connors, T., Durney, O., Esposito, S., Hoffmann, W., Jones, T., Leisenring, J., Montoya, M., Nash, M., Nelson, M., McMahon, T., Pinna, E., Puglisi, A., Skemer, A., Skrutskie, M., & Vaitheeswaran, V. (2012, jul). "First AO-corrected interferometry with LBTI: steps towards routine coherent imaging observations". In Optical and Infrared Interferometry III, 8445.
• Kuzmenko, P. J., Little, S. L., Little, L. M., Wilson, J. C., Skrutskie, M. F., Hinz, P. M., Leisenring, J. M., & Durney, O. (2012, sep). "Fabrication and testing of germanium grisms for LMIRcam". In Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 8450.
• Leisenring, J., Skrutskie, M., Hinz, P., Skemer, A., Bailey, V., Eisner, J., Garnavich, P., Hoffmann, W., Jones, T., Kenworthy, M., Kuzmenko, P., Meyer, M., Nelson, M., Rodigas, T., Wilson, J., & Vaitheeswaran, V. (2012, sep). "On-sky operations and performance of LMIRcam at the Large Binocular Telescope". In Ground-based and Airborne Instrumentation for Astronomy IV, 8446.
• Wehmeier, U. J., Leisenring, J., Durney, O., Solheid, E., Luppino, G. A., & Meyer, M. R. (2012, sep). "An integrated 1-5 micron test bench for the characterization of cryogenic optical elements". In Ground-based and Airborne Instrumentation for Astronomy IV, 8446.
• Leisenring, J. M., Nelson, M. J., Hoffmann, W. F., Schoenwald, J., Wong, A., & Skrutskie, M. F. (2010, jul). "Integration and characterization of HAWAII-1RG detector with FORCAST fast-readout electronics for LMIRcam". In Ground-based and Airborne Instrumentation for Astronomy III, 7735.
• Skrutskie, M., Jones, T., Hinz, P., Garnavich, P., Wilson, J., Nelson, M., Solheid, E., Durney, O., Hoffmann, W., Vaitheeswaran, V., McMahon, T., Leisenring, J., & Wong, A. (2010, jul). "The Large Binocular Telescope mid-infrared camera (LMIRcam): final design and status". In Ground-based and Airborne Instrumentation for Astronomy III, 7735.

Presentations

• Atkinson, D., Meyers, M., Bowens, R., Leisenring, J., Hoffman, B., Hart, D., & Morzinski, K. (2020, oct). GeoSnap: A 1024x1024 HgCdTe array covering 3-13um. Ground-Based Thermal Infrared Astronomy - Past, Present and Future.
• Meyer, M., Leisenring, J., Hoffman, W., Atkinson, D., Bowens, R., & Morzinski, K. (2020, oct). AO-assisted Ground-based Mid-Infrared Imaging in the JWST Era: MIRAC-5 with Geosnap. Ground-Based Thermal Infrared Astronomy - Past, Present and Future.