SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B
Brown dwarfs with measured dynamical masses and spectra from direct imaging are benchmarks that anchor substellar atmosphere cooling and evolution models. We present Subaru SCExAO/CHARIS infrared spectroscopy of HIP 93398 B, a brown dwarf companion recently discovered by Y. Li et al. ( 2023 ), as pa...
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2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad90bc |
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| author | Briley L. Lewis Yiting Li Aidan Gibbs Michael P. Fitzgerald Timothy Brandt Daniella Bardalez Gagliuffi Qier An Minghan Chen Rachel Bowens-Rubin Maïssa Salama Julien Lozi Rebecca Jensen-Clem Ben Mazin |
| author_facet | Briley L. Lewis Yiting Li Aidan Gibbs Michael P. Fitzgerald Timothy Brandt Daniella Bardalez Gagliuffi Qier An Minghan Chen Rachel Bowens-Rubin Maïssa Salama Julien Lozi Rebecca Jensen-Clem Ben Mazin |
| author_sort | Briley L. Lewis |
| collection | DOAJ |
| description | Brown dwarfs with measured dynamical masses and spectra from direct imaging are benchmarks that anchor substellar atmosphere cooling and evolution models. We present Subaru SCExAO/CHARIS infrared spectroscopy of HIP 93398 B, a brown dwarf companion recently discovered by Y. Li et al. ( 2023 ), as part of an informed survey using the Hipparcos–Gaia Catalog of Accelerations. This object was previously classified as a T6 dwarf based on its luminosity, with its independently derived age and dynamical mass in tension with existing models of brown dwarf evolution. Spectral typing via empirical standard spectra, temperatures derived by fitting substellar atmosphere models, and J − H , J − K and $H-L^{\prime} $ colors all suggest that this object has a substantially higher temperature and luminosity, consistent with classification as a late-L dwarf near the L/T transition ( T = ${1200}_{-119}^{+140}$ K) with moderate to thick clouds possibly present in its atmosphere. When compared with the latest generation of evolution models that account for clouds with our revised luminosity and temperature for the object, the tension between the model-independent mass/age and model predictions is resolved. |
| format | Article |
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| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-037c0668dde645c198f4b72c34930caa2025-08-20T01:58:12ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01977224710.3847/1538-4357/ad90bcSCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 BBriley L. Lewis0https://orcid.org/0000-0002-8984-4319Yiting Li1https://orcid.org/0000-0002-6845-9702Aidan Gibbs2https://orcid.org/0000-0002-9027-4456Michael P. Fitzgerald3https://orcid.org/0000-0002-0176-8973Timothy Brandt4https://orcid.org/0000-0003-2630-8073Daniella Bardalez Gagliuffi5https://orcid.org/0000-0001-8170-7072Qier An6https://orcid.org/0000-0003-0115-547XMinghan Chen7https://orcid.org/0000-0001-8892-4045Rachel Bowens-Rubin8https://orcid.org/0000-0001-5831-9530Maïssa Salama9https://orcid.org/0000-0002-5082-6332Julien Lozi10https://orcid.org/0000-0002-3047-1845Rebecca Jensen-Clem11https://orcid.org/0000-0003-0054-2953Ben Mazin12https://orcid.org/0000-0003-0526-1114Department of Physics and Astronomy , UCLA, Los Angeles, CA 90095, USA ; brileylewis@g.ucla.edu; Department of Physics , UCSB, Santa Barbara, CA 93106, USADepartment of Physics , UCSB, Santa Barbara, CA 93106, USA; Department of Astronomy, University of Michigan , Ann Arbor, MI 48109, USADepartment of Physics and Astronomy , UCLA, Los Angeles, CA 90095, USA ; brileylewis@g.ucla.eduDepartment of Physics and Astronomy , UCLA, Los Angeles, CA 90095, USA ; brileylewis@g.ucla.eduDepartment of Physics , UCSB, Santa Barbara, CA 93106, USA; Space Telescope Science Institute , Baltimore, MD, 21218, USADepartment of Physics and Astronomy , Amherst College, Amherst, MA 01002, USADepartment of Physics , UCSB, Santa Barbara, CA 93106, USA; Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USADepartment of Physics , UCSB, Santa Barbara, CA 93106, USADepartment of Astronomy , UCSC, Santa Cruz, CA 95064, USADepartment of Astronomy , UCSC, Santa Cruz, CA 95064, USASubaru Telescope, National Astronomical Observatory of Japan , 650 North Aohoku Place, Hilo, HI 96720, USADepartment of Astronomy , UCSC, Santa Cruz, CA 95064, USADepartment of Physics , UCSB, Santa Barbara, CA 93106, USABrown dwarfs with measured dynamical masses and spectra from direct imaging are benchmarks that anchor substellar atmosphere cooling and evolution models. We present Subaru SCExAO/CHARIS infrared spectroscopy of HIP 93398 B, a brown dwarf companion recently discovered by Y. Li et al. ( 2023 ), as part of an informed survey using the Hipparcos–Gaia Catalog of Accelerations. This object was previously classified as a T6 dwarf based on its luminosity, with its independently derived age and dynamical mass in tension with existing models of brown dwarf evolution. Spectral typing via empirical standard spectra, temperatures derived by fitting substellar atmosphere models, and J − H , J − K and $H-L^{\prime} $ colors all suggest that this object has a substantially higher temperature and luminosity, consistent with classification as a late-L dwarf near the L/T transition ( T = ${1200}_{-119}^{+140}$ K) with moderate to thick clouds possibly present in its atmosphere. When compared with the latest generation of evolution models that account for clouds with our revised luminosity and temperature for the object, the tension between the model-independent mass/age and model predictions is resolved.https://doi.org/10.3847/1538-4357/ad90bcDirect imagingHigh contrast techniquesCoronagraphic imagingHigh contrast spectroscopyBrown dwarfsL dwarfs |
| spellingShingle | Briley L. Lewis Yiting Li Aidan Gibbs Michael P. Fitzgerald Timothy Brandt Daniella Bardalez Gagliuffi Qier An Minghan Chen Rachel Bowens-Rubin Maïssa Salama Julien Lozi Rebecca Jensen-Clem Ben Mazin SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B The Astrophysical Journal Direct imaging High contrast techniques Coronagraphic imaging High contrast spectroscopy Brown dwarfs L dwarfs |
| title | SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B |
| title_full | SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B |
| title_fullStr | SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B |
| title_full_unstemmed | SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B |
| title_short | SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B |
| title_sort | scexao charis spectroscopic characterization of cloudy l t transition companion brown dwarf hip 93398 b |
| topic | Direct imaging High contrast techniques Coronagraphic imaging High contrast spectroscopy Brown dwarfs L dwarfs |
| url | https://doi.org/10.3847/1538-4357/ad90bc |
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