A close-in planet orbiting giant star HD 167768

• DOI: 10.1093/pasj/psac097
• Publication Date: 2022-12-07T13:06:54Z
• Authors: Huan-Yu Teng; Bun’ei Sato; Masanobu Kunitomo; Takuya Takarada; Masashi Omiya; Hiroki Harakawa; Guang-Yao Xiao; Yu-Juan Liu; Hideyuki Izumiura; Eiji Kambe; Michitoshi Yoshida; Yoichi Itoh; Hiroyasu Ando; Eiichiro Kokubo; Shigeru Ida
• Keywords: Radial velocity; Jupiter (rocket family); Orbital period; Minimum mass; Giant planet; Star (game theory)

Abstract We report the detection of a giant planet orbiting G-type star HD 167768 from radial velocity measurements using High Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory (OAO). has mass $1.08_{-0.12}^{+0.14}\, M_{\odot }$, radius $9.70_{-0.25}^{+0.25}\, R_{\odot metallicity $[\mbox{Fe}/\mbox{H}]=-0.67_{-0.08}^{+0.09}$, and surface gravity $\log g = 2.50_{-0.06}^{+0.06}$. The is warm Jupiter, having period $20.6532_{-0.0032}^{+0.0032}\:\mbox{d}$, minimum $0.85_{-0.11}^{+0.12}\, M_{\rm {J}}$, an orbital semimajor axis $0.1512_{-0.0063}^{+0.0058}\:\mbox{au}$. one shortest periods among those ever found around deeply evolved stars (log < 3.5) methods. equilibrium temperature 1874 K, as high hot Jupiter. velocities show two additional regular variations 41 d 95 d, suggesting possibility outer companions in system. Follow-up monitoring will enable validation periodicity. also calculated evolution b that be engulfed within 0.15 Gyr.