文章基本信息

标题：The CARMENES search for exoplanets around M dwarfs
其他标题：HD147379 b: A nearby Neptune in the temperate zone of an early-M dwarf★
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作者：A. Reiners ; I. Ribas ; M. Zechmeister 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：609
DOI：10.1051/0004-6361/201732165
语种：English
出版社：EDP Sciences
摘要：We report on the first star discovered to host a planet detected by radial velocity (RV) observations obtained within the CARMENES survey for exoplanets around M dwarfs. HD 147379 (V = 8.9 mag,M = 0.58 ± 0.08 M⊙), a bright M0.0 V star at a distance of 10.7 pc, is found to undergo periodic RV variations with a semi-amplitude ofK = 5.1 ± 0.4 m s−1and a period ofP = 86.54 ± 0.06 d. The RV signal is found in our CARMENES data, which were taken between 2016 and 2017, and is supported by HIRES/Keck observations that were obtained since 2000. The RV variations are interpreted as resulting from a planet of minimum massmP sin i = 25 ± 2 M⊕, 1.5 times the mass of Neptune, with an orbital semi-major axisa = 0.32 au and low eccentricity (e< 0.13). HD 147379 b is orbiting inside the temperate zone around the star, where water could exist in liquid form. The RV time-series and various spectroscopic indicators show additional hints of variations at an approximate period of 21.1 d (and its first harmonic), which we attribute to the rotation period of the star.
关键词：Keywordsenstars: individual: HD 147379planets and satellites: individual: HD 147379 bstars: activitystars: rotationstars: late-typestars: low-mass