Kane, Stephen R. and Mahadevan, Suvrath and Cochran, William D. and Street, Rachel A. and Sivarani, Thirupathi and Henry, Gregory W. and Williamson, Michael H. (2009) Discovery of a low-mass companion to the solar-type star TYC 2534-698-1. Astrophysical Journal, 692 (1). pp. 290-297. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090409-152456699
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Brown dwarfs and low-mass stellar companions are interesting objects to study since they occupy the mass region between deuterium and hydrogen burning. We report here the serendipitous discovery of a low-mass companion in an eccentric orbit around a solar-type main-sequence star. The stellar primary, TYC 2534-698-1, is a G2V star that was monitored both spectroscopically and photometrically over the course of several months. Radial velocity observations indicate a minimum mass of 0.037 M⊙ and an orbital period of ~103 days for the companion. Photometry outside of the transit window shows the star to be stable to within ~6 millimags. The semimajor axis of the orbit places the companion in the "brown dwarf desert" and we discuss potential follow-up observations that could constrain the mass of the companion.
|Additional Information:||© 2009 The American Astronomical Society. Received 2008 September 23; accepted 2008 November 10; published 2009 February 18 The authors would like to thank Leslie Hebb for several useful discussions, the HET staff astronomers for performing the observations, and Bertrand Plez for providing the newversion of the turbo spectrum code which uses the latest MARCS models. We would also like to thank University of Texas at Austin for awarding Director’s Discretionary Time which allowed us to obtain complete phase coverage of the target. The HET is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians- Universiät at München, and Georg-August-Universität Göttingen. The HET is named in honor of its principal benefactors, William P. Hobby and Robert E. Eberly.|
|Subject Keywords:||planetary systems; stars: low-mass, brown dwarfs|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||17 Jul 2009 23:44|
|Last Modified:||26 Dec 2012 10:56|
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