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LHS 6343 C: A Transiting Field Brown Dwarf Discovered by the Kepler Mission

Johnson, John Asher and Apps, Kevin and Gazak, J. Zachary and Crepp, Justin R. and Crossfield, Ian J. and Howard, Andrew W. and Marcy, Geoff W. and Morton, Timothy D. and Chubak, Carly and Isaacson, Howard (2011) LHS 6343 C: A Transiting Field Brown Dwarf Discovered by the Kepler Mission. Astrophysical Journal, 730 (2). Art. No. 79. ISSN 0004-637X.

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We report the discovery of a brown dwarf that transits one member of the M+M binary system LHS 6343 AB every 12.71 days. The transits were discovered using photometric data from the Kepler public data release. The LHS 6343 stellar system was previously identified as a single high proper motion M dwarf. We use adaptive optics imaging to resolve the system into two low-mass stars with masses 0.370 ± 0.009 M_⊙ and 0.30 ± 0.01 M_⊙, respectively, and a projected separation of 0".55. High-resolution spectroscopy shows that the more massive component undergoes Doppler variations consistent with Keplerian motion, with a period equal to the transit period and an amplitude consistent with a companion mass of M_C = 62.7 ± 2.4 M_(Jup). Based on our analysis of the transit light curve, we estimate the radius of the companion to be R_C = 0.833 ± 0.021 R_(Jup), which is consistent with theoretical predictions of the radius of a >1 Gyr brown dwarf.

Item Type:Article
Related URLs:
URLURL TypeDescription
Johnson, John Asher0000-0001-9808-7172
Crepp, Justin R.0000-0003-0800-0593
Crossfield, Ian J.0000-0002-1835-1891
Howard, Andrew W.0000-0001-8638-0320
Marcy, Geoff W.0000-0002-2909-0113
Morton, Timothy D.0000-0002-8537-5711
Isaacson, Howard0000-0002-0531-1073
Additional Information:© 2011 American Astronomical Society. Received 2010 September 8; accepted 2011 January 18; published 2011 March 8. Based on observations obtained at the W. M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology. Keck time has been granted by Caltech, the University of California, and NASA. We thank Keivan Stassun and Leslie Hebb for providing us with their B and V photometry of the LHS 6343 system. We thank Jonathan Irwin for his independent analysis of the Kepler light curve and for encouraging us to incorporate the third-light correction into our forward-modeling procedure; Josh Carter for independently confirming our best-fitting light curve parameters; and John Gizis for pointing out an error in our calculation of the brown dwarf mass in an earlier draft of this manuscript. We gratefully acknowledge the tireless dedication and hard work of the Kepler team, without whom this project would not be possible. In particular, we thank Jon Jenkins and Lucianne Walkowicz for confirming the planet-like nature of the transits following the initial identification of transit events by K.A. We gratefully acknowledge the efforts and dedication of the Keck Observatory staff, especially Grant Hill, Scott Dahm, and Hien Tran for their support of HIRES and Greg Wirth for support of remote observing. We made use of the SIMBAD database operated at CDS, Strasbourge, France, and NASA’s Astrophysics Data System Bibliographic Services. A.W.H. gratefully acknowledges support from a Townes Post-doctoral Fellowship at the U.C. Berkeley Space Sciences Laboratory. G.W.M. acknowledges NASA grant NNX06AH52G. Finally, we extend special thanks to those of Hawaiian ancestry on whose sacred mountain of Mauna Kea we are privileged to be guests. Without their generous hospitality, the Keck observations presented herein would not have been possible.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
University of California, BerkeleyUNSPECIFIED
Subject Keywords:binaries: eclipsing; binaries: spectroscopic; brown dwarfs; stars: fundamental parameters; stars: low-mass; techniques: photometric; techniques: radial velocities
Issue or Number:2
Classification Code:PACS: 97.20.Vs; 95.10.Gi; 97.20.Jg; 95.85.Kr
Record Number:CaltechAUTHORS:20110414-085412708
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Official Citation:LHS 6343 C: A Transiting Field Brown Dwarf Discovered by the Kepler Mission John Asher Johnson, Kevin Apps, J. Zachary Gazak, Justin R. Crepp, Ian J. Crossfield, Andrew W. Howard, Geoff W. Marcy, Timothy D. Morton, Carly Chubak and Howard Isaacson doi: 10.1088/0004-637X/730/2/79
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23328
Deposited By: Ruth Sustaita
Deposited On:15 Apr 2011 16:45
Last Modified:09 Mar 2020 13:18

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