Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314
Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314
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DOI：
10.1093/pasj/62.4.1063
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发表时间：
2010-05
影响因子：
2.3
通讯作者：
B. Sato;M. Omiya;Yujuan Liu;H. Harakawa;H. Izumiura;E. Kambe;E. Toyota;D. Murata;Byeong-Cheol Lee;S. Masuda;Y. Takeda;Michitoshi Yoshida;Y. Itoh;H. Ando;E. Kokubo;S. Ida;Gang Zhao;I. Han
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文献类型：
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作者：
B. Sato;M. Omiya;Yujuan Liu;H. Harakawa;H. Izumiura;E. Kambe;E. Toyota;D. Murata;Byeong-Cheol Lee;S. Masuda;Y. Takeda;Michitoshi Yoshida;Y. Itoh;H. Ando;E. Kokubo;S. Ida;Gang Zhao;I. Han
我们报告了通过斯巴鲁望远镜和冈山天体物理天文台的精确多普勒测量，探测到围绕进化的中等质量恒星运行的两个亚恒星伴星。HD 145457是一颗K0的巨星，质量为1.9 M ω，有一颗最小质量的行星，m2 sin i = 2.9 MJ，轨道周期为P = 176 d，离心率为e = 0:11。HD 180314也是一颗K0巨星，质量为2.6M ω，拥有一颗伴星m2 sin i = 22 MJ，属于褐矮星质量范围，轨道P = 396 d, e = 0.26。HD 145457 b是最内层的行星之一，HD 180314 b是在演化的中等质量恒星周围发现的第七个褐矮星质量伴星。
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 Mˇ, and has a planet of minimum mass, m2 sin i = 2.9 MJ, orbiting with a period of P = 176 d and eccentricity of e = 0:11. HD 180314 is also a K0 giant with 2.6Mˇ, and hosts a substellar companion of m2 sin i = 22 MJ, which falls in the 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 a brown-dwarf-mass companion found around evolved intermediate-mass stars.