A Possible Substellar Companion to the Intermediate-mass Giant HD 175679

Details A Possible Substellar Companion to the Intermediate-mass Giant HD 175679 A Possible Substellar Companion to the Intermediate-mass Giant HD 175679

2011-10-04

arxiv.org/abs/1110.0559v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

10 pages, 3 figures, RAA accepted

Scientific paper

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 \pm 5.7 days, a semiamplitude of 380.2 \pm 3.2m s.1, and an eccentricity of 0.378 \pm 0.008. Adopting a stellar mass of 2.7 \pm 0.3 M\odot, we obtain the minimum mass of the HD 175679 b is 37.3 \pm 2.8 MJ, and the semimajor axis is 3.36 \pm 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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