Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data
We present follow-up SCExAO/CHARIS H- and K -band ( R ∼ 70) high-contrast integral field spectroscopy and Keck/NIRC2 photometry of directly imaged brown dwarf companion HD 33632 Ab and new radial-velocity data for the system from the SOPHIE spectrograph, complemented by Hipparcos and Gaia astrometr...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ada3be |
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| author | Mona El Morsy Thayne Currie Danielle Bovie Masayuki Kuzuhara Brianna Lacy Yiting Li Taylor Tobin Timothy D. Brandt Jeffrey Chilcote Olivier Guyon Tyler D. Groff Julien Lozi Sebastien Vievard Vincent Deo Nour Skaf Francois Bouchy Isabelle Boisse Erica Dykes N. Jeremy Kasdin Motohide Tamura |
| author_facet | Mona El Morsy Thayne Currie Danielle Bovie Masayuki Kuzuhara Brianna Lacy Yiting Li Taylor Tobin Timothy D. Brandt Jeffrey Chilcote Olivier Guyon Tyler D. Groff Julien Lozi Sebastien Vievard Vincent Deo Nour Skaf Francois Bouchy Isabelle Boisse Erica Dykes N. Jeremy Kasdin Motohide Tamura |
| author_sort | Mona El Morsy |
| collection | DOAJ |
| description | We present follow-up SCExAO/CHARIS H- and K -band ( R ∼ 70) high-contrast integral field spectroscopy and Keck/NIRC2 photometry of directly imaged brown dwarf companion HD 33632 Ab and new radial-velocity data for the system from the SOPHIE spectrograph, complemented by Hipparcos and Gaia astrometry. These data enable more robust spectral characterization compared to lower-resolution spectra from the discovery paper and more than double the available astrometric and radial-velocity baseline. HD 33632 Ab’s spectrum is well reproduced by a field L8.5–L9.5 dwarf. Using the Exo-REM atmosphere models, we derive a best-fit temperature, surface gravity, and radius of T _eff = 1250 K, log( g ) = 5, and R = 0.97 R _J , respectively, as well as a solar C/O ratio. Adding the SOPHIE radial-velocity data enables far tighter constraints on the companion’s orbital properties (e.g., i = ${47.5}_{-4.7}^{+2.5}$ ^o ) and dynamical mass ( ${52.8}_{-2.4}^{+2.6}$ M _J ) than derived from imaging data and Gaia eDR3 astrometry data alone. HD 33632 Ab should be a prime target for multiband imaging and spectroscopy with the James Webb Space Telescope and the Roman Space Telescope’s Coronagraphic Instrument, shedding detailed light on HD 33632 Ab’s clouds and chemistry and providing a key reference point for understanding young exoplanet atmospheres. |
| format | Article |
| id | doaj-art-6b2fb2ecee314bef9e2dfcd7e3dd83a2 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-6b2fb2ecee314bef9e2dfcd7e3dd83a22025-08-20T02:14:38ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198112010.3847/1538-4357/ada3beDynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity DataMona El Morsy0Thayne Currie1https://orcid.org/0000-0002-7405-3119Danielle Bovie2Masayuki Kuzuhara3https://orcid.org/0000-0002-4677-9182Brianna Lacy4https://orcid.org/0000-0002-9420-4455Yiting Li5Taylor Tobin6https://orcid.org/0000-0001-8103-5499Timothy D. Brandt7https://orcid.org/0000-0003-2630-8073Jeffrey Chilcote8Olivier Guyon9https://orcid.org/0000-0002-1097-9908Tyler D. Groff10https://orcid.org/0000-0001-5978-3247Julien Lozi11https://orcid.org/0000-0002-3047-1845Sebastien Vievard12https://orcid.org/0000-0003-4018-2569Vincent Deo13Nour Skaf14Francois Bouchy15https://orcid.org/0000-0002-7613-393XIsabelle Boisse16Erica Dykes17N. Jeremy Kasdin18https://orcid.org/0000-0002-6963-7486Motohide Tamura19https://orcid.org/0000-0002-6510-0681Department of Physics and Astronomy, University of Texas-San Antonio , San Antonio, TX, USA ; mona.elmorsy@utsa.eduDepartment of Physics and Astronomy, University of Texas-San Antonio , San Antonio, TX, USA ; mona.elmorsy@utsa.edu; Subaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USADepartment of Physics and Astronomy, University of Texas-San Antonio , San Antonio, TX, USA ; mona.elmorsy@utsa.eduAstrobiology Center of NINS , 2-21-1, Osawa, Mitaka, Tokyo, 181-8588, Japan; National Astronomical Observatory of Japan , 2-21-2, Osawa, Mitaka, Tokyo, 181-8588, JapanDepartment of Astronomy and Astrophysics, University of California-Santa Cruz , Santa Cruz, CA, USADepartment of Astronomy, University of Michigan , 1085 S. University, Ann Arbor, MI 48109, USADepartment of Astronomy, University of Michigan , 1085 S. University, Ann Arbor, MI 48109, USASpace Telescope Science Institute , Baltimore, MD, USA; Department of Physics, University of California , Santa Barbara, Santa Barbara, California, USADepartment of Physics, University of Notre Dame , South Bend, IN, USASubaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USA; Astrobiology Center of NINS , 2-21-1, Osawa, Mitaka, Tokyo, 181-8588, Japan; Steward Observatory, The University of Arizona , Tucson, AZ 85721, USA; College of Optical Sciences, University of Arizona , Tucson, AZ 85721, USANASA-Goddard Space Flight Center , Greenbelt, MD, USASubaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USASubaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USASubaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USADepartment of Astronomy and Astrophysics, University of California-Santa Cruz , Santa Cruz, CA, USAObservatoire Astronomique de l’Université de Genève , Geneva, SwitzerlandLaboratoire d’Astrophysique de Marseille , Marseille, France; Observatoire de Haute-Provence , 04870 Saint-Michel-l’Observatoire, FranceDepartment of Physics and Astronomy, University of Texas-San Antonio , San Antonio, TX, USA ; mona.elmorsy@utsa.eduDepartment of Mechanical Engineering, Princeton University , Princeton, NJ, USAAstrobiology Center of NINS , 2-21-1, Osawa, Mitaka, Tokyo, 181-8588, Japan; National Astronomical Observatory of Japan , 2-21-2, Osawa, Mitaka, Tokyo, 181-8588, Japan; Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, JapanWe present follow-up SCExAO/CHARIS H- and K -band ( R ∼ 70) high-contrast integral field spectroscopy and Keck/NIRC2 photometry of directly imaged brown dwarf companion HD 33632 Ab and new radial-velocity data for the system from the SOPHIE spectrograph, complemented by Hipparcos and Gaia astrometry. These data enable more robust spectral characterization compared to lower-resolution spectra from the discovery paper and more than double the available astrometric and radial-velocity baseline. HD 33632 Ab’s spectrum is well reproduced by a field L8.5–L9.5 dwarf. Using the Exo-REM atmosphere models, we derive a best-fit temperature, surface gravity, and radius of T _eff = 1250 K, log( g ) = 5, and R = 0.97 R _J , respectively, as well as a solar C/O ratio. Adding the SOPHIE radial-velocity data enables far tighter constraints on the companion’s orbital properties (e.g., i = ${47.5}_{-4.7}^{+2.5}$ ^o ) and dynamical mass ( ${52.8}_{-2.4}^{+2.6}$ M _J ) than derived from imaging data and Gaia eDR3 astrometry data alone. HD 33632 Ab should be a prime target for multiband imaging and spectroscopy with the James Webb Space Telescope and the Roman Space Telescope’s Coronagraphic Instrument, shedding detailed light on HD 33632 Ab’s clouds and chemistry and providing a key reference point for understanding young exoplanet atmospheres.https://doi.org/10.3847/1538-4357/ada3beAdaptive opticsBrown dwarfsExoplanetsDirect imaging |
| spellingShingle | Mona El Morsy Thayne Currie Danielle Bovie Masayuki Kuzuhara Brianna Lacy Yiting Li Taylor Tobin Timothy D. Brandt Jeffrey Chilcote Olivier Guyon Tyler D. Groff Julien Lozi Sebastien Vievard Vincent Deo Nour Skaf Francois Bouchy Isabelle Boisse Erica Dykes N. Jeremy Kasdin Motohide Tamura Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data The Astrophysical Journal Adaptive optics Brown dwarfs Exoplanets Direct imaging |
| title | Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data |
| title_full | Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data |
| title_fullStr | Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data |
| title_full_unstemmed | Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data |
| title_short | Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data |
| title_sort | dynamical and atmospheric characterization of the substellar companion hd 33632 ab from direct imaging astrometry and radial velocity data |
| topic | Adaptive optics Brown dwarfs Exoplanets Direct imaging |
| url | https://doi.org/10.3847/1538-4357/ada3be |
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