Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, ξ Aquilae, and HD 81688
Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, ξ Aquilae, and HD 81688
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DOI：
10.1093/pasj/60.3.539
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发表时间：
2008-02
影响因子：
2.3
通讯作者：
B. Sato;H. Izumiura;E. Toyota;E. Kambe;M. Ikoma;M. Omiya;S. Masuda;Y. Takeda;D. Murata;Y. Itoh;H. Ando;Michitoshi Yoshida;E. Kokubo;S. Ida
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作者：
B. Sato;H. Izumiura;E. Toyota;E. Kambe;M. Ikoma;M. Omiya;S. Masuda;Y. Takeda;D. Murata;Y. Itoh;H. Ando;Michitoshi Yoshida;E. Kokubo;S. Ida
本文报道了冈山天文台在对G和K巨星的精密多普勒巡天中发现的3颗新的太阳系外行星。主恒星18 Del（G6 III）、Aql（K 0 III）和HD 81688（K 0 III-IV）在HR图上位于团簇区域，估计质量为2.1- 2.3兆焦耳。8 Del B的最小质量为10：3兆焦耳，轨道周期为993 d，是演化恒星周围最长的轨道。� Aq lb和HD 81688 B的最小质量分别为2.8和2.7 MJ，轨道周期分别为137和184 d，是演化恒星中最短的轨道。所有在中等质量（1.7- 3.9百万光年）c块巨行星周围发现的亚恒星伴星，其半长轴都大于0.68 Au，这意味着短周期行星的缺乏。我们的数值计算表明，
We report on the detection of 3 new extrasolar planets from a precise Doppler survey of G and K giants at Okayama Astrophysical Observatory. The host stars, 18 Del (G6 III), � Aql (K0 III) and HD 81688 (K0 III–IV), are located in the clump region on the HR diagram with estimated masses of 2.1–2.3Mˇ .1 8 Del b has a minimum mass of 10:3MJ and resides in a nearly circular orbit with period of 993 d, which is the longest one around evolved stars. � Aq lb and HD 81688 b have minimum masses of 2.8 and 2.7MJ ,a nd reside in nearly circular orbits with periods of 137 and 184 d, respectively, which are the shortest ones around evolved stars. All of the substellar companions ever discovered around intermediate-mass (1.7–3.9Mˇ )c lump giants have semimajor axes larger than 0.68 AU, suggesting a lack of short-period planets. Our numerical calculations suggest that Jupiter-mass planets within about