A Substellar Companion to the Intermediate-Mass Giant 11 Comae

A Substellar Companion to the Intermediate-Mass Giant 11 Comae
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中等质量巨星 11 彗发的亚恒星伴星

DOI:
10.1086/523297
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发表时间:
2007-09
影响因子:
4.9
通讯作者:
Bun'ei Sato
Bun'ei Sato
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
et a;Zhao G.;Wang H.;Liu Y. J.;K. Noguchi;Bun'ei Sato

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我们报告检测到一个亚恒星的同伴绕着中等质量的巨星星星11 Com(G8 III)。兴隆站和冈山天体物理观测站(OAO)对该星星的精确多普勒测量显示,开普勒速度变化的轨道周期为326.03 ± 0.32天,半振幅为302.8 ± 2.6 m s−1,离心率为0.231 ± 0.005。采用2.7 ± 0.3 M的恒星质量,伴星的最小质量为19.4 ± 1.5 MJ,远高于氘燃烧极限,半长轴为1.29 ± 0.05 Au。这是中国和日本联合行星搜索计划的第一个结果,旨在揭示中等质量巨星周围的亚恒星同伴的统计数据。11 Com B是从OAO行星搜索计划的300个目标中产生的。该计划目前对褐矮星候选者的探测率似乎与轨道间隔为103 Au的太阳型恒星的探测率相当。
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☉, the minimum mass of the companion is 19.4 ± 1.5 MJ, 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 ≲3 AU.
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发表时间: 2002-09
期刊: The Astrophysical Journal
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