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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 ...

  • 2021-11-19
  • American Astronomical Society,2021
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-199697
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-199697URI
  • https://doi.org/10.3847/1538-3881/ac29baDOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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 and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Tobin, Taylor (author)
  • Currie, Thayne (author)
  • Brandt, Timothy D. (author)
  • Groff, Tyler D. (author)
  • Kuzuhara, Masayuki (author)
  • Guyon, Olivier (author)
  • Lozi, Julien (author)
  • Jovanovic, Nemanja (author)
  • Sahoo, Ananya (author)
  • Deo, Vincent (author)
  • Akiyama, Eiji (author)
  • Janson, MarkusStockholms universitet,Institutionen för astronomi(Swepub:su)mjanso (author)
  • Knapp, Jill (author)
  • Kwon, Jungmi (author)
  • McElwain, Michael W. (author)
  • Nishikawa, Jun (author)
  • Wagner, Kevin (author)
  • Hełminiak, Krzysztof (author)
  • Skaf, Nour (author)
  • Tamura, Motohide (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Astronomical Journal: American Astronomical Society162:60004-62561538-3881

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