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

被引:37
作者
Sato, Bun'ei [1 ]
Omiya, Masashi [2 ]
Liu, Yujuan [3 ]
Harakawa, Hiroki [4 ]
Izumiura, Hideyuki [5 ,6 ]
Kambe, Eiji [5 ]
Toyota, Eri [7 ]
Murata, Daisuke [8 ]
Lee, Byeong-Cheol [2 ,9 ]
Masuda, Seiji [10 ]
Takeda, Yoichi [6 ,11 ]
Yoshida, Michitoshi [12 ]
Itoh, Yoichi [8 ]
Ando, Hiroyasu [6 ,11 ]
Kokubo, Eiichiro [6 ,11 ]
Ida, Shigeru [4 ]
Zhao, Gang [13 ]
Han, Inwoo [2 ]
机构
[1] Tokyo Inst Technol, Global Edge Inst, Meguro Ku, Tokyo 1528550, Japan
[2] Korea Astron & Space Sci Inst, Taejon 305348, South Korea
[3] Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
[4] Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, Tokyo 1528551, Japan
[5] Natl Inst Nat Sci, Natl Astron Observ Japan, Okayama Astrophys Observ, Kamogata, Okayama 7190232, Japan
[6] Grad Univ Adv Studies, Kanagawa 2400193, Japan
[7] Kobe Sci Museum, Chuo Ku, Kobe, Hyogo 6500046, Japan
[8] Kobe Univ, Grad Sch Sci, Nada Ku, Kobe, Hyogo 6578501, Japan
[9] Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Taegu 702701, South Korea
[10] Tokushima Sci Museum, Itano, Tokushima 7790111, Japan
[11] Natl Inst Nat Sci, Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
[12] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima 7398526, Japan
[13] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
基金
中国国家自然科学基金; 日本学术振兴会;
关键词
stars: individual (HD 145457); stars: individual (HD 180314); stars: planetary systems; techniques: radial velocities; GIANT PLANET FORMATION; F-TYPE STARS; EXTRASOLAR PLANETS; OKAYAMA HIDES; BROWN DWARFS; IODINE CELLS; SUBARU HDS; K-GIANTS; EXOPLANETS; ABUNDANCES;
D O I
10.1093/pasj/62.4.1063
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on the detection of two substellar companions orbiting around evolved intermediate-mass stars by precise Doppler measurements at Subaru Telescope and Okayama Astrophysical Observatory. HD 145457 is a K0 giant with a mass of 1.9 M-circle dot, and has a planet of minimum mass, m(2) sin i = 2.9 M-J, orbiting with a period of P = 176 d and eccentricity of e = 0.11. HD 180314 is also a K0 giant with 2.6 M-circle dot, and hosts a substellar companion of m2 sin i = 22 M-J, which falls in the brown-dwarf mass regime, in an orbit with P = 396 d and e = 0.26. HD 145457b is one of the innermost planets and HD 180314 b is the seventh candidate of a brown-dwarf-mass companion found around evolved intermediate-mass stars.
引用
收藏
页码:1063 / 1069
页数:7
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