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The TRENDS High-contrast Imaging Survey. I. Three Benchmark M Dwarfs Orbiting Solar-type Stars

Crepp, Justin R. and Johnson, John Asher and Howard, Andrew W. and Marcy, Geoff W. and Fischer, Debra A. and Hillenbrand, Lynne A. and Yantek, Scott M. and Delaney, Colleen R. and Wright, Jason T. and Isaacson, Howard T. and Montet, Benjamin T. (2012) The TRENDS High-contrast Imaging Survey. I. Three Benchmark M Dwarfs Orbiting Solar-type Stars. Astrophysical Journal, 761 (1). Art. No. 39. ISSN 0004-637X.

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We present initial results from a new high-contrast imaging program dedicated to stars that exhibit long-term Doppler radial velocity accelerations (or "trends"). The goal of the TRENDS (TaRgetting bENchmark-objects with Doppler Spectroscopy) imaging survey is to directly detect and study the companions responsible for accelerating their host star. In this first paper of the series, we report the discovery of low-mass stellar companions orbiting HD 53665, HD 68017, and HD 71881 using NIRC2 adaptive optics (AO) observations at Keck. Follow-up imaging demonstrates association through common proper motion. These comoving companions have red colors with estimated spectral types of K7-M0, M5, and M3-M4, respectively. We determine a firm lower limit to their mass from Doppler and astrometric measurements. In the near future, it will be possible to construct three-dimensional orbits and calculate the dynamical mass of HD 68017 B and possibly HD 71881 B. We already detect astrometric orbital motion of HD 68017 B, which has a projected separation of 13.0 AU. Each companion is amenable to AO-assisted direct spectroscopy. Further, each companion orbits a solar-type star, making it possible to infer metallicity and age from the primary. Such benchmark objects are essential for testing theoretical models of cool dwarf atmospheres.

Item Type:Article
Related URLs:
URLURL TypeDescription
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, Howard T.0000-0002-0531-1073
Montet, Benjamin T.0000-0001-7516-8308
Additional Information:© 2012 American Astronomical Society. Received 2012 July 9; accepted 2012 October 10; published 2012 November 20. J.C. acknowledges support from 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:astrometry; stars: individual (HD 53665, HD 68017, HD 71881); stars: low-mass; techniques: high angular resolution; techniques: radial velocities
Issue or Number:1
Record Number:CaltechAUTHORS:20130108-094023981
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Official Citation:The TRENDS High-contrast Imaging Survey. I. Three Benchmark M Dwarfs Orbiting Solar-type Stars Justin R. Crepp et al. 2012 ApJ 761 39
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36229
Deposited By: Ruth Sustaita
Deposited On:08 Jan 2013 17:53
Last Modified:09 Mar 2020 13:18

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