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

查看全文 作　　者：Liang [1,2]Wang;Bun'ei [3]Sato;Gang [1]Zhao;Yu-Juan [1]Liu;Kunio [4]Noguchi;Hirovasu [4]Ando;Hideyuki [5]Izumiura;Eiji [5]Kambe;Masashi [3]Omiya;Hiroki [3]Harakawa;Fan [1,2]Liu;Xiao-Shu [1,2]Wu;Yoichi [4]Takeda;Michitoshi [6]Yoshida;Eiichiro [4]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》索引2012年第12卷第1期,共9页 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 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. 关 键 词：恒星质量 中等质量 巨型 数据显示 径向速度 天体物理 速度变化 轨道周期