A substellar companion to the intermediate-mass giant 11 Comae

	A substellar companion to the intermediate-mass giant 11 Comae
	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
刊名	ASTROPHYSICAL JOURNAL
	2008
卷号	672 期号:1 页码:553-557
关键词	planetary systems stars : individual (11 Comae = HD 107383) stars : low-mass brown dwarfs techniques : radial velocities
英文摘要	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000253454000050
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7390]
专题	国家天文台_光学天文研究部
作者单位	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
推荐引用方式 GB/T 7714	Liu, Y. -J.,Sato, Bun'ei,Zhao, G.,et al. A substellar companion to the intermediate-mass giant 11 Comae[J]. ASTROPHYSICAL JOURNAL,2008,672(1):553-557.
APA	Liu, Y. -J..,Sato, Bun'ei.,Zhao, G..,Noguchi, Kunio.,Wang, H..,...&Ida, Shigeru.(2008).A substellar companion to the intermediate-mass giant 11 Comae.ASTROPHYSICAL JOURNAL,672(1),553-557.
MLA	Liu, Y. -J.,et al."A substellar companion to the intermediate-mass giant 11 Comae".ASTROPHYSICAL JOURNAL 672.1(2008):553-557.