Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314

Bun'ei Sato , Masashi Omiya , Yujuan Liu , Hiroki Harakawa , Hideyuki Izumiura , Eiji Kambe , Eri Toyota , Daisuke Murata

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Byeong-Cheol Lee Seiji Masuda Yoichi Takeda Michitoshi Yoshida Yoichi Itoh Hiroyasu Ando Eiichiro Kokubo Shigeru Ida Gang Zhao Inwoo Han

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classification 🌌 astro-ph.EP

keywords evolvedintermediate-massmassstarssubstellararoundcompanioncompanions

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We report the detections of two substellar companions orbiting around evolved intermediate-mass stars from precise Doppler measurements at Subaru Telescope and Okayama Astrophysical Observatory. HD 145457 is a K0 giant with a mass of 1.9 M_sun and has a planet of minimum mass m_2sini=2.9 M_J orbiting with period of P=176 d and eccentricity of e=0.11. HD 180314 is also a K0 giant with 2.6 M_sun and hosts a substellar companion of m_2sin i=22 M_J, which falls in brown-dwarf mass regime, in an orbit with P=396 d and e=0.26. HD 145457 b is one of the innermost planets and HD 180314 b is the seventh candidate of brown-dwarf-mass companion found around intermediate-mass evolved stars.

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Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314

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