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The TRENDS High-Contrast Imaging Survey. III. A Faint White Dwarf Companion Orbiting HD 114174

Crepp, Justin R. and Johnson, John Asher and Howard, Andrew W. and Marcy, Geoffrey W. and Gianninas, Alexandros and Kilic, Mukremin and Wright, Jason T. (2013) The TRENDS High-Contrast Imaging Survey. III. A Faint White Dwarf Companion Orbiting HD 114174. Astrophysical Journal, 774 (1). Art. No. 1. ISSN 0004-637X.

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The nearby Sun-like star HD 114174 exhibits a strong and persistent Doppler acceleration indicating the presence of an unseen distant companion. We have acquired high-contrast imaging observations of this star using NIRC2 at Keck and report the direct detection of the body responsible for causing the "trend." HD 114174 B has a projected separation of 692 ± 9 mas (18.1 AU) and is 10.75 ± 0.12 mag (contrast of 5 × 10^(–5)) fainter than its host in the K-band, requiring aggressive point-spread function subtraction to identify. Our astrometric time baseline of 1.4 yr demonstrates physical association through common proper motion. We find that the companion has absolute magnitude, M_J = 13.97 ± 0.11, and colors, J – K = 0.12 ± 0.16 mag. These characteristics are consistent with an ≈T3 dwarf, initially leading us to believe that HD 114174 B was a substellar object. However, a dynamical analysis that combines radial velocity measurements with available imaging data indicates a minimum mass of 0.260 ± 0.010 M_☉. We conclude that HD 114174 B must be a white dwarf. Assuming a hydrogen-rich composition, atmospheric and evolutionary model fits yield an effective temperature T_(eff) = 8200 ± 4000 K, surface gravity log g = 8.90 ± 0.02, and cooling age of t_c ≈ 3.4 Gyr, which is consistent with the 4.7^(+2.3)_(-2.6) Gyr host star isochronal age estimate. HD 114174 B is a benchmark object located only 26.14 ± 0.37 pc from the Sun. It may be studied at a level of detail comparable to Sirius and Procyon, and used to understand the link between the mass of white dwarf remnants with that of their progenitors.

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, Geoffrey W.0000-0002-2909-0113
Wright, Jason T.0000-0001-6160-5888
Additional Information:© 2013 American Astronomical Society. Received 2013 May 2; accepted 2013 June 24; published 2013 August 7. We thank Sasha Hinkley for trading NIRC2 observing time that allowed us to acquire observations of HD 114174 B in a complementary bandpass, demonstrating its unusual colors, and Mike Liu for pointing out reference to the Gliese 86 system which shares a similar story as HD 114174 B for being a white dwarf initially characterized as a brown dwarf. The referee, John Subasavage, provided helpful comments that improved the clarity of our manuscript. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. The TRENDS high-contrast imaging program is supported by NASA Origins grant NNX13AB03G. J.A.J. is supported by generous grants from the David and Lucile Packard Foundation and the Alfred P. Sloan Foundation. 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
David and Lucile Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
Pennsylvania State UniversityUNSPECIFIED
Eberly College of ScienceUNSPECIFIED
Pennsylvania Space Grant ConsortiumUNSPECIFIED
Subject Keywords: astrometry; stars: individual (HD 114174); techniques: high angular resolution; techniques: radial velocities; white dwarfs
Issue or Number:1
Record Number:CaltechAUTHORS:20130924-095847561
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Official Citation:The TRENDS High-Contrast Imaging Survey. III. A Faint White Dwarf Companion Orbiting HD 114174 Justin R. Crepp et al. 2013 ApJ 774 1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41495
Deposited By: Ruth Sustaita
Deposited On:24 Sep 2013 18:11
Last Modified:09 Mar 2020 13:18

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