A Possible Substellar Companion to the Intermediate-mass Giant HD 175679
Abstract
We report the discovery of a substellar companion around the intermediatemass giant HD 175679. Precise radial velocity data of the star from Xinglong Station and Okayama Astrophysical Observatory (OAO) revealed a Keplerian velocity variation with an orbital period of 1366.8 5.7 days, a semiamplitude of 380.2 3.2m s.1, and an eccentricity of 0.378 0.008. Adopting a stellar mass of 2.7 0.3 M, we obtain the minimum mass of the HD 175679 b is 37.3 2.8 MJ, and the semimajor axis is 3.36 0.12 AU. This discovery is the second brown dwarf companion candidate from a joint planet-search program between China and Japan.
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