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A PLANET CANDIDATE IN THE STELLAR TRIPLE SYSTEM HD 178911

机译:星际三重系统HD 178911中的候选行星

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We report the detection of a low-mass companion orbiting the solar-type star HD 178911B, the distant component of the stellar triple system HD 178911. The variability of HD 178911B was first detected using radial velocity measurements obtained with the High Resolution Echelle Spectrometer mounted on the 10 m Keck 1 telescope at the W. M. Keck Observatory (Hawaii). We then started an intense radial velocity follow-up of the star with the ELODIE echelle spectrograph mounted on the 1.93 m telescope at the Observatoire de Haute-Provence (France) in order to derive its orbital solution The detected planet candidate has an orbital period of 71.5 days and a minimum mass of 6.3 M_J. We performed a spectral analysis of the star that shows that the lithium abundances in the system are similar to those in another known planet-hosting wide binary stellar system, 16 Cyg. In both systems the lithium is undetected in the atmosphere of the visual secondary harboring the planetary companion but is easily detected in the spectrum of the visual primary. We discuss this similarity and its ramifications.
机译:我们报告检测到绕太阳型恒星HD 178911B(恒星三重系统HD 178911的遥远组件)绕行的低质量伴星。HD178911B的变异性首先是通过安装有高分辨率Echelle光谱仪的径向速度测量值进行检测的由位于夏威夷WM凯克天文台的10 m凯克1号望远镜拍摄。然后,我们利用位于法国上普罗旺斯天文台1.93 m望远镜上的ELODIE echelle光谱仪对恒星进行了强烈的径向速度跟踪,以求出其轨道解。被探测到的行星候选轨道周期为71.5天,最小质量为6.3 M_J。我们对这颗恒星进行了光谱分析,结果表明该系统中的锂丰度与另一个已知的拥有行星的宽恒星恒星系统16 Cyg中的锂丰度相似。在这两个系统中,在带有行星伴侣的视觉辅助大气中都未检测到锂,但在视觉初级光谱中很容易检测到锂。我们讨论这种相似性及其后果。

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