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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
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Currie, Thayne (author)
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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, Markus (author)
- Stockholms universitet,Institutionen för astronomi
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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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(creator_code:org_t)
- 2020-11-30
- 2020
- English.
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In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 904:2
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https://iopscience.i...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Exoplanets
- Brown dwarfs
- Astronomical instrumentation
- Astronomical optics
- Direct imaging
- Coronagraphic imaging
- Exoplanet detection methods
- Astronomical techniques
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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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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show more...
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Groff, Tyler D.
-
Lozi, Julien
-
Vievard, Sebasti ...
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Sahoo, Ananya
-
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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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Astrophysical Jo ...
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Stockholm University