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SCExAO/CHARIS Direc...
SCExAO/CHARIS Direct Imaging of A Low-mass Companion At A Saturn-like Separation from an Accelerating Young A7 Star
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Chilcote, Jeffrey (author)
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Tobin, Taylor (author)
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Currie, Thayne (author)
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Brandt, Timothy D. (author)
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Groff, Tyler D. (author)
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Kuzuhara, Masayuki (author)
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Guyon, Olivier (author)
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Lozi, Julien (author)
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Jovanovic, Nemanja (author)
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Sahoo, Ananya (author)
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Deo, Vincent (author)
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Akiyama, Eiji (author)
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- Janson, Markus (author)
- Stockholms universitet,Institutionen för astronomi
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Knapp, Jill (author)
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Kwon, Jungmi (author)
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McElwain, Michael W. (author)
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Nishikawa, Jun (author)
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Wagner, Kevin (author)
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Hełminiak, Krzysztof (author)
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Skaf, Nour (author)
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Tamura, Motohide (author)
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(creator_code:org_t)
- 2021-11-19
- 2021
- English.
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In: Astronomical Journal. - : American Astronomical Society. - 0004-6256 .- 1538-3881. ; 162:6
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
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- We present the SCExAO direct imaging discovery and characterization of a low-mass companion to the nearby young A7IV star, HD 91312. SCExAO/CHARIS JHK (1.1–2.4 μm) spectra and SCExAO/HiCIAO H-band imaging identify the companion over a two year baseline in a highly inclined orbit with a maximum projected separation of 8 au. The companion, HD 91312 B, induces an 8.8σ astrometric acceleration on the star as seen with the Gaia & Hipparcos satellites and a long-term radial-velocity trend as previously identified by Borgniet et al. HD 91312 B's spectrum is consistent with that of an early-to-mid M dwarf. Hipparcos and Gaia absolute astrometry, radial-velocity data, and SCExAO/CHARIS astrometry constrain its dynamical mass to be 0.337-0.044+0.042 M⊙, consistent with - but far more precise than - masses derived from spectroscopy, and favors a nearly edge-on orbit with a semimajor axis of ∼9.7 au. This work is an example of precisely characterizing properties of low-mass companions at solar system-like scales from a combination of direct imaging, astrometry, and radial-velocity methods.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Chilcote, Jeffre ...
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Tobin, Taylor
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Currie, Thayne
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Brandt, Timothy ...
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Groff, Tyler D.
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Kuzuhara, Masayu ...
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show more...
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Guyon, Olivier
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Lozi, Julien
-
Jovanovic, Neman ...
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Sahoo, Ananya
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Deo, Vincent
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Akiyama, Eiji
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Janson, Markus
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Knapp, Jill
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Kwon, Jungmi
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McElwain, Michae ...
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Nishikawa, Jun
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Wagner, Kevin
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Hełminiak, Krzys ...
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Skaf, Nour
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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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Astronomical Jou ...
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Stockholm University