A Planetary Companion to the Intermediate-Mass Giant HD 100655

Abstract

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$\ M_{\odot}$, we confirmed the presence of a planetary companion with a semi-major axis of 0.76 AU and a minimum mass of 1.7$\ M_{\mathrm{J}}$. The planet is the lowest-mass planet yet discovered around clump giants with masses greater than 1.9$\ M_{\odot}$.