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SCExAO/CHARIS Direc...
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Chilcote, Jeffrey
(author)
SCExAO/CHARIS Direct Imaging of A Low-mass Companion At A Saturn-like Separation from an Accelerating Young A7 Star
- Article/chapterEnglish2021
Publisher, publication year, extent ...
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2021-11-19
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American Astronomical Society,2021
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Numbers
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LIBRIS-ID:oai:DiVA.org:su-199697
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-199697URI
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https://doi.org/10.3847/1538-3881/ac29baDOI
Supplementary language notes
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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
Notes
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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.
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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, MarkusStockholms universitet,Institutionen för astronomi(Swepub:su)mjanso
(author)
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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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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astronomical Journal: American Astronomical Society162:60004-62561538-3881
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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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Guyon, Olivier
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Lozi, Julien
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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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Stockholm University