Vol 12, No 1

A possible substellar companion to the intermediate-mass giant HD 175679

Liang Wang, Bun’ei Sato, Gang Zhao, Yu-Juan Liu, Kunio Noguchi, Hiroyasu Ando, Hideyuki Izumiura, Eiji Kambe, Masashi Omiya, Hiroki Harakawa, Fan Liu, Xiao-Shu Wu, Yoichi Takeda, Michitoshi Yoshida, Eiichiro Kokubo


Abstract We report the discovery of a substellar companion around the intermediatemass giant HD 175679. Precise radial velocity data of the star from the Xinglong Station and the Okayama Astrophysical Observatory revealed a Keplerian velocity variation with an orbital period of 1366.8±5.7 d, a semiamplitude of 380.2±3.2 m s−1 and an eccentricity of 0.378 ± 0.008. Adopting a stellar mass of 2.7 ± 0.3 M⊙, we obtain that 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.


Keywords stars: individual (HD 175679) — stars: brown dwarfs — techniques: radial velocities

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