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HD 91669B: A NEW BROWN DWARF CANDIDATE FROM THE MCDONALD OBSERVATORY PLANET SEARCH

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Robert A. Wittenmyer1,2, Michael Endl1, William D. Cochran1, Ivan Ramírez1,3, Sabine Reffert4, Phillip J. MacQueen1 and Matthew Shetrone1

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We report the detection of a brown dwarf candidate orbiting the metal-rich K dwarf HD 91669, based on radial-velocity data from the McDonald Observatory Planet Search. HD 91669b is a substellar object in an eccentric orbit (e = 0.45) at a separation of 1.2 AU. The minimum mass of 30.6M Jup places this object firmly within the brown dwarf desert for inclinations i gsim 23°. This is the second rare close-in brown dwarf candidate discovered by the McDonald planet search program.


Keywords

planetary systems; stars: individual (HD 91669); stars: low-mass, brown dwarfs


Dates

Issue 3 (2009 March)

Received 2008 September 8, accepted for publication 2008 December 19

Published 2009 February 17



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