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

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

机构地区：[1]Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [3]Department of Earth and Planetary Sciences, Graduate Sclaooi of Science and Engineering,Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan [4]National Astronomical Observatory of Japan, National Institutes of Natural Sciences,. Mitaka,Tokyo 181-8588, Japan [5]Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, NationalInstitutes of Natural Sciences, Asakuchi, Okayama 719-0232, Japan [6]Hiroshima Astrophysical Science Center, Hiroshima University, -1-3-1 Kagamiyama,Higashi-Hiroshima 739-8526, Japan

出　　处：《Research in Astronomy and Astrophysics》2012年第1期84-92,共9页天文和天体物理学研究（英文版）

基　　金：the National Natural Science Foundation of China (Grant Nos. 10821061 and 10803010);the Japan Society for the Promotion of Science under grant 08032011-000184 in the framework of the Joint Research Project between China and Japan

摘　　要：We report the discovery of a substellar companion around the intermediate- mass 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 M 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.We report the discovery of a substellar companion around the intermediate- mass 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 M 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.

关 键 词：stars： individual （HD 175679） -- stars： brown dwarfs -- techniques：radial velocities 

分 类 号：P148[天文地球—天体物理] P145.8[天文地球—天文学]