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SCExAO/CHARIS Direc...
SCExAO/CHARIS Direct Imaging Discovery of a 20 au Separation, Low-mass Ratio Brown Dwarf Companion to an Accelerating Sun-like Star
- Article/chapterEnglish2020
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2020-11-30
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American Astronomical Society,2020
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LIBRIS-ID:oai:DiVA.org:su-189208
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-189208URI
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https://doi.org/10.3847/2041-8213/abc631DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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We present the direct imaging discovery of a substellar companion to the nearby Sun-like star, HD 33632 Aa, at a projected separation of similar to 20 au, obtained with SCExAO/CHARIS integral field spectroscopy complemented by Keck/NIRC2 thermal infrared imaging. The companion, HD 33632 Ab, induces a 10.5 sigma astrometric acceleration on the star as detected with the Gaia and Hipparcos satellites. SCExAO/CHARIS JHK (1.1-2.4 mu m) spectra and Keck/NIRC2 L-p (3.78 mu m) photometry are best matched by a field L/T transition object: an older, higher-gravity, and less dusty counterpart to HR 8799 cde. Combining our astrometry with Gaia/Hipparcos data and archival Lick Observatory radial velocities, we measure a dynamical mass of 46.4 8 M-J and an eccentricity of e < 0.46 at 95% confidence. HD 33632 Ab's mass and mass ratio (4.0% 0.7%) are comparable to the low-mass brown dwarf GJ 758 B and intermediate between the more massive brown dwarf HD 19467 B and the (near-)planet-mass companions to HR 2562 and GJ 504. Using Gaia to select for direct imaging observations with the newest extreme adaptive optics systems can reveal substellar or even planet-mass companions on solar system-like scales at an increased frequency compared to blind surveys.
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Brandt, Timothy D.
(author)
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Kuzuhara, Masayuki
(author)
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Chilcote, Jeffrey
(author)
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Guyon, Olivier
(author)
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Marois, Christian
(author)
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Groff, Tyler D.
(author)
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Lozi, Julien
(author)
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Vievard, Sebastien
(author)
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Sahoo, Ananya
(author)
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Deo, Vincent
(author)
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Jovanovic, Nemanja
(author)
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Martinache, Frantz
(author)
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Wagner, Kevin
(author)
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Dupuy, Trent
(author)
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Wahl, Matthew
(author)
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Letawsky, Michael
(author)
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Li, Yiting
(author)
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Zeng, Yunlin
(author)
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Brandt, G. Mirek
(author)
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Michalik, Daniel
(author)
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Grady, Carol
(author)
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Janson, MarkusStockholms universitet,Institutionen för astronomi(Swepub:su)mjanso
(author)
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Knapp, Gillian R.
(author)
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Kwon, Jungmi
(author)
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Lawson, Kellen
(author)
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McElwain, Michael W.
(author)
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Uyama, Taichi
(author)
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Wisniewski, John
(author)
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Tamura, Motohide
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astrophysical Journal Letters: American Astronomical Society904:22041-82052041-8213
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Currie, Thayne
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Brandt, Timothy ...
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Kuzuhara, Masayu ...
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Chilcote, Jeffre ...
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Guyon, Olivier
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Marois, Christia ...
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Groff, Tyler D.
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Lozi, Julien
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Vievard, Sebasti ...
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Sahoo, Ananya
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Deo, Vincent
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Jovanovic, Neman ...
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Martinache, Fran ...
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Wagner, Kevin
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Dupuy, Trent
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Wahl, Matthew
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Letawsky, Michae ...
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Li, Yiting
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Zeng, Yunlin
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Brandt, G. Mirek
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Michalik, Daniel
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Grady, Carol
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Janson, Markus
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Knapp, Gillian R ...
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Kwon, Jungmi
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Lawson, Kellen
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McElwain, Michae ...
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Uyama, Taichi
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Wisniewski, John
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Tamura, Motohide
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Stockholm University