HD 91669b: A New Brown Dwarf Candidate from the McDonald Observatory Planet Search
Robert A. Wittenmyer, Michael Endl, William D. Cochran, Ivan Ramirez,, Sabine Reffert, Phillip J. MacQueen, Matthew Shetrone
TL;DR
This paper reports the discovery of a brown dwarf candidate orbiting a metal-rich K dwarf, using radial velocity data, contributing to the understanding of the brown dwarf desert phenomenon.
Contribution
It presents the detection of a new brown dwarf candidate with specific orbital characteristics, adding valuable data to the rare close-in brown dwarf population.
Findings
Minimum mass of 30.6 Jupiter masses.
Eccentric orbit with e=0.45.
Located at 1.2 AU from host star.
Abstract
We report the detection of a candidate brown dwarf 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 30.6 Jupiter masses places this object firmly within the brown dwarf desert for inclinations i>23 degrees. This is the second rare close-in brown dwarf candidate discovered by the McDonald planet search program.
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