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A Korea-Japan planet search program: Current status and discovery of a brown dwarf candidate

  • Masashi Omiya (a1), Hideyuki Izumiura (a2), Bun'ei Sato (a3), Michitoshi Yoshida (a2), Eiji Kambe (a2), Eri Toyota (a4), Seitaro Urakawa (a5), Seiji Masuda (a6), Masahide Takada-Hidai (a7), Inwoo Han (a8), Kang-Min Kim (a8), Byeong-Cheol Lee (a8) (a9) and Tae Seog Yoon (a9)...

Abstract

Since 2005, we have been carrying out a precise radial velocity survey of about 190 intermediate-mass (1.5-5 M) G and K giants at Bohyunsan Optical Astronomy Observatory (BOAO) in Korea and Okayama Astrophysical Observatory (OAO) in Japan, which aims to reveal statistical properties of planetary systems around intermediate-mass stars. We have finished the first screening of 120 stars so far and have identified 5 candidates with large periodic radial velocity variations. One of the candidates turned out to be orbited by a brown dwarf mass companion with minimum mass of 37.6 MJup and semimajor axis of 1.71 AU. The primary star has a mass of 3.9 M, which ranks among the most massive stars with substellar companions. Our discovery may support the current view obtained from results of planet searches around intermediate-mass stars that massive substellar companions tend to form around massive stars.

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