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

Published online by Cambridge University Press:  01 October 2007

Masashi Omiya ,
Hideyuki Izumiura ,
Bun'ei Sato ,
Michitoshi Yoshida ,
Eiji Kambe ,
Eri Toyota ,
Seitaro Urakawa ,
Seiji Masuda ,
Masahide Takada-Hidai  and
Inwoo Han
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Masashi Omiya
Affiliation:
Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan email: [email protected]
Hideyuki Izumiura
Affiliation:
Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, Okayama 719-0232, Japan
Bun'ei Sato
Affiliation:
Global Edge Institute, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan
Michitoshi Yoshida
Affiliation:
Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, Okayama 719-0232, Japan
Eiji Kambe
Affiliation:
Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, Okayama 719-0232, Japan
Eri Toyota
Affiliation:
Graduate School of Science, Kobe University, Kobe, Hyogo 657-8501, Japan
Seitaro Urakawa
Affiliation:
Japan Spaceguard Association, Shibuya-ku, Tokyo 151-0073, Japan
Seiji Masuda
Affiliation:
Tokushima Science Museum, Asutamu Land Tokushima, Itano-gun, Tokushima 779-0111, Japan
Masahide Takada-Hidai
Affiliation:
Liberal Arts Education Center, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
Inwoo Han
Affiliation:
Korea Astronomy and Space Science Institute, Daejeon 305-348, South Korea
Kang-Min Kim
Affiliation:
Korea Astronomy and Space Science Institute, Daejeon 305-348, South Korea
Byeong-Cheol Lee
Affiliation:
Korea Astronomy and Space Science Institute, Daejeon 305-348, South Korea Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu 702-701, South Korea
Tae Seog Yoon
Affiliation:
Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu 702-701, South Korea
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Abstract

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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.

Keywords

stars: low-massbrown dwarfstechniques: radial velocities
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S249: Exoplanets: Detection, Formation and Dynamics , October 2007 , pp. 53 - 56
Copyright
Copyright © International Astronomical Union 2008

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