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, Byeong-Cheol Lee, Seiji, Masuda, Yoichi Takeda, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando,, Eiichiro Kokubo, Shigeru Ida, Gang Zhao, Inwoo Han
TL;DR
This paper reports the discovery of two substellar companions, including a planet and a brown dwarf, orbiting evolved intermediate-mass stars, expanding the known diversity of such systems.
Contribution
It presents the first detections of substellar companions around evolved intermediate-mass stars using precise Doppler measurements, including a planet and a brown dwarf candidate.
Findings
HD 145457 hosts a planet of 2.9 M_J with a 176-day orbit.
HD 180314 hosts a brown-dwarf-mass companion of 22 M_J with a 396-day orbit.
HD 180314 b is among the few brown-dwarf companions found around such stars.
Abstract
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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