A substellar companion to the intermediate-mass giant 11 Comae

被引：64

作者：

Liu, Y. -J. ^{[1
,2
]}

Sato, Bun'ei ^{[3
]}

Zhao, G. ^{[1
]}

Noguchi, Kunio ^{[4
]}

Wang, H. ^{[1
]}

Kambe, Eiji ^{[5
]}

Ando, Hiroyasu ^{[4
]}

Izumiura, Hideyuki ^{[5
,6
]}

Chen, Y. -Q. ^{[1
]}

Okada, Norio ^{[4
]}

Toyota, Eri ^{[7
]}

Omiya, Masashi ^{[8
]}

Masuda, Seiji ^{[9
]}

Takeda, Yoichi ^{[4
]}

Murata, Daisuke ^{[7
]}

Itoh, Yoichi ^{[7
]}

Yoshida, Michitoshi ^{[5
]}

Kokubo, Eiichiro ^{[4
]}

Ida, Shigeru ^{[10
]}

机构：

[1] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[3] Tokyo Inst Technol, Global Edge Inst, Meguro Ku, Tokyo 1528550, Japan

[4] Natl Inst Nat Sci, Natl Astron Observ Japan, Tokyo 1818558, Japan

[5] Natl Inst Nat Sci, Natl Astron Observ Japan, Okayama Astrophys Observ, Kamogatacho, Okayama 7190232, Japan

[6] Univ Adv Studies Sokendai, Dept Astron Sci, Kanagawa 2400193, Japan

[7] Kobe Univ, Grad Sch Sci, Kobe, Hyogo 6578501, Japan

[8] Tokai Univ, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan

[9] Atamu Land Tokushima, Tokushima Sci Museum, Tokushima 7790111, Japan

[10] Tokyo Inst Technol, Dept Earth & Planetary Sci, Tokyo 1528550, Japan

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 672卷 / 01期

关键词：

planetary systems; stars : individual (11 Comae = HD 107383); stars : low-mass; brown dwarfs; techniques : radial velocities;

D O I：

10.1086/523297

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of a substellar companion orbiting the intermediate-mass giant star 11 Com (G8 III). Precise Doppler measurements of the star from Xinglong Station and Okayama Astrophysical Observatory (OAO) reveal Keplerian velocity variations with an orbital period of 326.03 +/- 0.32 days, a semiamplitude of 302.8 +/- 2.6 m s(-1), and an eccentricity of 0.231 +/- 0.005. Adopting a stellar mass of 2.7 +/- 0.3 M circle dot, the minimum mass of the companion is 19.4 +/- 1.5 M-J, well above the deuterium-burning limit, and the semimajor axis is 1.29 +/- 0.05 AU. This is the first result from a joint planet-search program between China and Japan aimed at revealing the statistics of substellar companions around intermediate-mass giants. 11 Com b emerged from 300 targets of the planet-search program at OAO. The program's current detection rate of brown dwarf candidates seems to be comparable to the rate of such detections around solar-type stars with orbital separations of less than or similar to 3 AU.

引用

页码：553 / 557

页数：5

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