A Planetary Companion to the Intermediate-Mass Giant HD 100655

Masashi Omiya , Inwoo Han , Hideyuki Izumiura , Byeong-Cheol Lee , Bun'ei Sato , Kang-Min Kim , Tae Seog Yoon , Eiji Kambe

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Michitoshi Yoshida Seiji Masuda Eri Toyota Seitaro Urakawa Masahide Takada-Hidai

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classification 🌌 astro-ph.EP

keywords companionplanetplanetaryaroundclumpgiantintermediate-massmass

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A precise radial velocity survey conducted by a Korean-Japanese planet search program revealed a planetary companion around the intermediate-mass clump giant HD 100655. The radial velocity of the star exhibits a periodic Keplerian variation with a period, semi-amplitude and eccentricity of 157.57 d, 35.2 m s^-1 and 0.085, respectively. Adopting an estimated stellar mass of 2.4 M_Sun, we confirmed the presence of a planetary companion with a semi-major axis of 0.76 AU and a minimum mass of 1.7 M_Jup. The planet is the lowest-mass planet yet discovered around clump giants with masses greater than 1.9 M_Sun.

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A Planetary Companion to the Intermediate-Mass Giant HD 100655

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