CT
Christopher A. Theissen
astro-ph.EPastro-ph.SRastro-ph.GAastro-ph.IMastro-ph.HEastro-ph.COcs.LGhep-phphysics.geo-ph
On Valency
published · living versionsW_a7qmt8gm·v1 · currentpublished
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems IX: A Multi-Wavelength Framework for Source Characterization in JWST Coronagraphic Imaging of the HIP 65426 System
with Evelyn L. Bruinsma, Aarynn L. Carter, Sasha Hinkley, Beth A. Biller +26
1 version
Preprints & journals
82 papers in the corpus · 2009–2026What does self-supervision add to engineered features for stellar light curves?2610.14283v1 · Zijun Liu, Yue Ma, Christopher A. Theissen2026 · 0 citationsarXiv
JWST Observations of the Metal-poor T Dwarf WISEA J155349.96+693355.2: The First Brown Dwarf Associated with the Gaia-Enceladus Milky Way Substructure2609.29365v2 · Aaron M. Meisner, Adam J. Burgasser, Chih-Chun Hsu et al.2026 · 0 citationsarXiv
Metal-poor Brown Dwarf Kinematics from JWST NIRSpec Spectroscopy2609.28746v2 · Chih-Chun Hsu, Christopher A. Theissen, Adam J. Burgasser et al.2026 · 0 citationsThe Astrophysical Journal, 1011, (2026), 87
The Dyn-Atmo Survey: High-contrast Imaging Spectroscopy of the Substellar Companion HD 13724 B with the JWST NIRSpec IFU2609.11827v1 · Kielan K. W. Hoch, Alex Madurowicz, Evert Nasedkin et al.2026 · 0 citationsarXiv
The Dyn-Atmo Survey: JWST/NIRSpec spectroscopy of dynamical benchmark GJ 758 B2609.11828v1 · Alexander Madurowicz, Emily Rickman, Daniella Bardalez Gagliuffi et al.2026 · 0 citationsarXiv
EncoTESS: Age-Sensitive Encodings from Raw TESS Light Curves2608.25019v1 · Phil R. Van-Lane, Joshua S. Speagle, Ryan Cloutier et al.2026 · 0 citationsarXiv
An Evolving Cosmic Shoreline and Sandbar Bounding the Rocky Airless Valley2608.23912v1 · Barron K. Nguyen, Laura K. Schaefer, Xuan Ji et al.2026 · 0 citationsAstrophys. J. Lett. 1008 (2026) L4
A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: III. Characterization of the Cold Imaged Planet Hosts AF Lep A and Indi A2608.15912v1 · Aneesh Baburaj, Quinn M. Konopacky, Christopher A. Theissen et al.2026 · 0 citationsarXiv
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems VIII: patchy forsterite and enstatite clouds in the atmosphere of VHS 1256 b, retrieval lessons learned and outlook to the future2608.06583v1 · Niall Whiteford, Jacqueline K. Faherty, Ben Burningham et al.2026 · 0 citationsarXiv
Stellar Multiplicity of M Dwarfs with Short-period Giant Planets, and the Characterization of TOI-5628Ab2607.10177v1 · Tianjun Gan, Alexandrine L'Heureux, Charles Cadieux et al.2026 · 0 citationsarXiv
Evidence of Radius Inflation Based on 50 Transiting Brown Dwarfs and Low-mass Stellar Companions2605.22655v1 · Aarushi Mehrotra, Chih-Chun Hsu, Jason J. Wang et al.2026 · 1 citationResearch Notes of the AAS, 10, (2026), 128
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. VII. Molecular Mapping Performance with JWST/MIRI MRS: VHS 1256 b as a case study2603.13543v3 · Mathilde Malin, Anthony Boccaletti, Benjamin Charnay et al.2026 · 1 citationarXiv
TOI-4616 b: a benchmark Earth-sized planet transiting a nearby M4 dwarf2603.10905v1 · F. Zong Lang, B. O. Demory, Y. Gomez Maqueo Chew et al.2026 · 0 citationsarXiv
Identifying and Characterizing Very Low Mass Spectral Blend Binaries with Machine Learning Methods2512.12098v1 · Juan Diego Draxl Giannoni (UCSD, TUM), Malina Desai et al.2025 · 0 citationsarXiv
A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: II. Diversity in C/O Ratios among Host Stars2510.17774v1 · Aneesh Baburaj, Quinn M. Konopacky, Christopher A. Theissen et al.2025 · 5 citationsAJ, 171, 1, 21 (2026)
Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf.41037589 · Burgasser, Adam J, Gonzales, Eileen C, Beiler, Samuel A et al.2025 · 18 citationsScience (New York, N.Y.). 2025;390(6774):697-701
Classifying Cool Dwarfs: Comprehensive Spectral Typing of Field and Peculiar Dwarfs Using Machine Learning2508.09370v1 · Tianxing Zhou, Christopher A. Theissen, S. Jean Feeser et al.2025 · 1 citationarXiv
A New Brown Dwarf Orbiting an M star and An Investigation on the Eccentricity Distribution of Transiting Long-Period Brown Dwarfs2507.09461v1 · Tianjun Gan, Charles Cadieux, Shigeru Ida et al.2025 · 5 citationsarXiv
Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence using SpeX and FIRE Observations2506.19928v2 · Fatemeh Davoudi, Benjamin V. Rackham, Julien de Wit et al.2025 · 0 citationsarXiv
Silicate clouds and a circumplanetary disk in the YSES-1 exoplanet system.40494394 · Hoch, K K W, Rowland, M, Petrus, S et al.2025 · 29 citationsNature. 2025;643(8073):938-942
Spectropolarimetric Evolution of SN 2023ixf: an Asymmetric Explosion in a Confined Aspherical Circumstellar Medium2505.03975v1 · Sergiy S. Vasylyev, Luc Dessart, Yi Yang et al.2025 · 2 citationsarXiv
TOI-6478 b: a cold under-dense Neptune transiting a fully convective M dwarf from the thick disc2504.06848v1 · Madison G. Scott, Amaury H.M.J. Triaud, Khalid Barkaoui et al.2025 · 5 citationsarXiv
SN 2023ixf in the Pinwheel Galaxy M101: From Shock Breakout to the Nebular Phase2503.13974v1 · Weikang Zheng, Luc Dessart, Alexei V. Filippenko et al.2025 · 12 citationsarXiv
TOI-6508b: A massive transiting brown dwarf orbiting a low-mass star2502.19940v1 · K. Barkaoui, D. Sebastian, S. Z'uniga-Fern'andez et al.2025 · 0 citationsarXiv
HD 206893 B at High Spectral Resolution with the Keck Planet Imager and Characterizer (KPIC)2501.13917v2 · Ben Sappey, Quinn Konopacky, Clarissa R. Do O et al.2025 · 0 citationsarXiv
Metallicity Dependence of Giant Planets around M Dwarfs2412.06137v2 · Tianjun Gan, Christopher A. Theissen, Sharon X. Wang et al.2024 · 16 citationsarXiv
New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs2411.01378v2 · Adam J. Burgasser (UCSD), Adam C. Schneider (USNO), Aaron M. Meisner et al.2024 · 20 citationsarXiv
A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: I. Determination of diagnostic stellar abundances for planet formation and composition2409.14239v1 · Aneesh Baburaj, Quinn M. Konopacky, Christopher A. Theissen et al.2024 · 10 citationsAJ 169, 55 (2025)
JWST-TST High Contrast: Spectroscopic Characterization of the Benchmark Brown Dwarf HD 19467 B with the NIRSpec Integral Field Spectrograph2408.03830v1 · Kielan K. W. Hoch, Christopher A. Theissen, Travis S. Barman et al.2024 · 11 citationsarXiv
Discovery of a Hypervelocity L Subdwarf at the Star/Brown Dwarf Mass Limit2407.08578v1 · Adam J. Burgasser (UC San Diego), Roman Gerasimov (Notre Dame), Kyle Kremer et al.2024 · 6 citationsarXiv
JWST/NIRCam 4-5 m Imaging of the Giant Planet AF Lep b2406.09528v2 · Kyle Franson, William O. Balmer, Brendan P. Bowler et al.2024 · 24 citationsarXiv
Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-32406.00794v1 · Michael Gillon, Peter P. Pedersen, Benjamin V. Rackham et al.2024 · 16 citationsarXiv
Three short-period Earth-sized planets around M dwarfs discovered by TESS: TOI-5720b, TOI-6008b and TOI-6086b2405.06350v3 · K. Barkaoui, R.P. Schwarz, N. Narita et al.2024 · 0 citationsarXiv
Orbital and Atmospheric Characterization of the 1RXS J034231.8+121622 System Using High-Resolution Spectroscopy Confirms That The Companion is a Low-Mass Star2404.07742v1 · Clarissa R. Do 'O, Ben Sappey, Quinn M. Konopacky et al.2024 · 5 citationsarXiv
The Brown Dwarf Kinematics Project (BDKP). VI. Ultracool Dwarf Radial and Rotational Velocities from SDSS/APOGEE High-resolution Spectroscopy2403.13760v2 · Chih-Chun Hsu, Adam J. Burgasser, Christopher A. Theissen et al.2024 · 9 citationsarXiv
The Wide-field Spectroscopic Telescope (WST) Science White Paper2403.05398v2 · Vincenzo Mainieri, Richard I. Anderson, Jarle Brinchmann et al.2024 · 15 citationsarXiv
89 New Ultracool Dwarf Co-Moving Companions Identified With The Backyard Worlds: Planet 9 Citizen Science Project2403.04592v2 · Austin Rothermich, Jacqueline K. Faherty, Daniella Bardalez-Gagliuffi et al.2024 · 23 citationsarXiv
Multiple Patchy Cloud Layers in the Planetary Mass Object SIMP0136+09332402.15001v2 · Allison M. McCarthy, Philip S. Muirhead, Patrick Tamburo et al.2024 · 18 citationsarXiv
The 3D Kinematics of the Orion Nebula Cluster II: Mass-dependent Kinematics of the Inner Cluster2312.04751v3 · Lingfeng Wei, Christopher A. Theissen, Quinn M. Konopacky et al.2023 · 7 citations2024 ApJ 962 174
The Initial Mass Function Based on the Full-sky 20-pc Census of $\sim$3,600 Stars and Brown Dwarfs2312.03639v1 · J. Davy Kirkpatrick, Federico Marocco, Christopher R. Gelino et al.2023 · 2 citationsarXiv
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 b2312.03852v2 · Simon Petrus, Niall Whiteford, Polychronis Patapis et al.2023 · 1 citationarXiv
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems IV: NIRISS Aperture Masking Interferometry Performance and Lessons Learned2310.11499v2 · Steph Sallum, Shrishmoy Ray, Jens Kammerer et al.2023 · 11 citationsarXiv
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 um2310.11508v3 · Shrishmoy Ray, Steph Sallum, Sasha Hinkley et al.2023 · 0 citationsarXiv
JWST-TST High Contrast: Achieving direct spectroscopy of faint substellar companions next to bright stars with the NIRSpec IFU2310.09902v2 · Jean-Baptiste Ruffio, Marshall D. Perrin, Kielan K. W. Hoch et al.2023 · 3 citationsarXiv
TESS discovery of a super-Earth orbiting the M dwarf star TOI-16802307.05368v2 · M. Ghachoui, A. Soubkiou, R.D. Wells et al.2023 · 14 citationsA&A 677, A31 (2023)
Early-time Spectropolarimetry of the Aspherical Type II Supernova SN 2023ixf2307.01268v2 · Sergiy S. Vasylyev, Yi Yang, Alexei V. Filippenko et al.2023 · 53 citationsarXiv
Extragalactic Star Cluster Science with the Nancy Grace Roman Space Telescope's High Latitude Wide Area Survey and the Vera C. Rubin Observatory2306.12620v1 · Kristen C. Dage, Christopher Usher, Jennifer Sobeck et al.2023 · 1 citationarXiv
NANCY: Next-generation All-sky Near-infrared Community surveY2306.11784v1 · Jiwon Jesse Han, Arjun Dey, Adrian M. Price-Whelan et al.2023 · 2 citationsarXiv
SN 2023ixf in Messier 101: Photo-ionization of Dense, Close-in Circumstellar Material in a Nearby Type II Supernova2306.04721v2 · W. V. Jacobson-Galan, L. Dessart, R. Margutti et al.2023 · 113 citationsarXiv
A super-Earth and a mini-Neptune near the 2:1 MMR straddling the radius valley around the nearby mid-M dwarf TOI-20962303.08174v1 · F. J. Pozuelos, M. Timmermans, B. V. Rackham et al.2023 · 34 citationsA&A 672, A70 (2023)
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