The trends high-contrast imaging survey. II. Direct detection of the hd 8375 tertiary

Justin R. Crepp, John Asher Johnson, Andrew W. Howard, Geoff W. Marcy, Debra A. Fischer, Scott M. Yantek, Jason T. Wright, Howard Isaacson, Ying Feng

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14 Scopus citations

Abstract

We present the direct imaging detection of a faint tertiary companion to the single-lined spectroscopic binary HD 8375 AB. Initially noticed as an 53 m s-1 yr-1 Doppler acceleration by Bowler et al., we have obtained high-contrast adaptive optics observations at Keck using NIRC2 that spatially resolve HD 8375 C from its host(s). Astrometric measurements demonstrate that the companion shares a common proper-motion. We detect orbital motion in a clockwise direction. Multiband relative photometry measurements are consistent with an early M-dwarf spectral type (sim;M1V). Our combined Doppler and imaging observations place a lower-limit of m ≥ 0.297 M on its dynamical mass. We also provide a refined orbit for the inner pair using recent radial velocity measurements obtained with the High Resolution Echelle Spectrometer. HD 8375 is one of many triple-star systems that are apparently missing in the solar neighborhood.

Original languageEnglish (US)
Article number46
JournalAstrophysical Journal
Volume771
Issue number1
DOIs
StatePublished - Jul 1 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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