* Astronomy

Title: A Possible Substellar Companion to the Intermediate-mass Giant HD 175679
Authors: Liang Wang, Bun'ei Sato, Gang Zhao, Yujuan Liu, Kunio Noguchi, Hiroyasu Ando, Hideyuki Izumiura, Eiji Kambe, Masashi Omiya, Hiroki Harakawa, Fan Liu, Xiaoshu Wu, Yoichi Takeda, Michitoshi Yoshida, Eiichiro Kokubo

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 solar masses, 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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