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, Michitoshi Yoshida, Seiji, Masuda, Eri Toyota, Seitaro Urakawa, Masahide Takada-Hidai
TL;DR
This paper reports the discovery of a low-mass planet orbiting the intermediate-mass giant star HD 100655, using precise radial velocity measurements, marking the lowest-mass planet found around such massive clump giants.
Contribution
It presents the first detection of a low-mass planet around a giant star with mass greater than 1.9 solar masses, expanding understanding of planetary systems around evolved intermediate-mass stars.
Findings
Planet has a 157.57-day orbit with 35.2 m/s semi-amplitude.
Minimum mass of the planet is 1.7 Jupiter masses.
The planet orbits at 0.76 AU from its host star.
Abstract
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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