A planetary companion to the G-type giant star HD 104985

被引：102

作者：

Sato, B ^{[1
]}

Ando, H

Kambe, E

Takeda, Y

Izumiura, H

Masuda, S

Watanabe, E

Noguchi, K

Wada, S

Okada, N

Koyano, H

Maehara, H

Norimoto, Y

Okada, T

Shimizu, Y

Uraguchi, F

Yanagisawa, K

Yoshida, M

机构：

[1] Natl Astron Observ, Tokyo 1818588, Japan

[2] Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan

[3] Natl Def Acad, Dept Earth & Ocean Sci, Kanagawa 2398686, Japan

[4] Komazawa Univ, Setagaya Ku, Tokyo 1548525, Japan

[5] Natl Astron Observ, Okayama Astrophsy Obser, Okayama 7190232, Japan

[6] Grad Univ Adv Studies, Dept Astron Sci, Tokyo 1818588, Japan

[7] Univ Electrocommun, Tokyo 1828585, Japan

[8] Natl Astron Observ, Subaru Telescope, Hilo, HI 96720 USA

来源：

ASTROPHYSICAL JOURNAL | 2003年 / 597卷 / 02期

基金：

美国国家科学基金会;

关键词：

planetary systems; stars : individual (HD 104985); techniques : radial velocities;

D O I：

10.1086/379967

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of a planetary-mass companion to the G9 III giant star HD 104985 from precise Doppler velocity measurements made using the High Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory. The radial velocity variability of this star is best explained by an orbital motion with a period of 198.2+/-0.3 days, a velocity semiamplitude of 161+/-2 m s(-1), and an eccentricity of 0.03+/-0.02 Assuming a stellar mass of 1.6 M-circle dot, we obtained a minimum mass and a semimajor axis of 6.3M(J) and 0.78 AU, respectively, for the companion. A probable upper limit to the stellar mass of 3 M-circle dot yielded, m(2) sin i=9.6 M-J which falls in the planetary-mass regime. This is the first discovery of a planetary companion orbiting a G-type giant star.

引用

页码：L157 / L160

页数：4

共 31 条

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