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The TRENDS High-contrast Imaging Survey. II. Direct Detection of the HD 8375 Tertiary

Crepp, Justin R. and Johnson, John Asher and Howard, Andrew W. and Marcy, Geoff W. and Fischer, Debra A. and Yantek, Scott M. and Wright, Jason T. and Isaacson, Howard and Feng, Ying (2013) The TRENDS High-contrast Imaging Survey. II. Direct Detection of the HD 8375 Tertiary. Astrophysical Journal, 771 (1). Art. No. 46. ISSN 0004-637X.

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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 (~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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Crepp, Justin R.0000-0003-0800-0593
Johnson, John Asher0000-0001-9808-7172
Howard, Andrew W.0000-0001-8638-0320
Marcy, Geoff W.0000-0002-2909-0113
Fischer, Debra A.0000-0003-2221-0861
Wright, Jason T.0000-0001-6160-5888
Isaacson, Howard0000-0002-0531-1073
Additional Information:© 2013 American Astronomical Society. Received 2012 October 27; accepted 2013 May 10; published 2013 June 14. The TRENDS high-contrast science program is supported in part by NASA Origins grant NNX13AB03G. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:astrometry; brown dwarfs; methods: observational; stars: individual (HD 8375); stars: low-mass; techniques: high angular resolution; techniques: radial velocities
Issue or Number:1
Record Number:CaltechAUTHORS:20130815-101238890
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Official Citation:The TRENDS High-contrast Imaging Survey. II. Direct Detection of the HD 8375 Tertiary Justin R. Crepp et al. 2013 ApJ 771 46
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39947
Deposited By: Jason Perez
Deposited On:16 Aug 2013 14:41
Last Modified:09 Mar 2020 13:18

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