期刊
ASTRONOMY & ASTROPHYSICS
卷 398, 期 2, 页码 L19-L23出版社
E D P SCIENCES
DOI: 10.1051/0004-6361:20021846
关键词
stars : late-type; stars : individual : HD 47536; technique : radial velocities; stars : planetary systems
We report evidence of a low-mass companion around the K1III giant star HD 47536. This star belongs to our sample of 83 subgiant and giant stars studied for their radial velocity variations using the FEROS spectrograph at the 1.52 m-ESO telescope on La Silla. We find that the radial velocity of HD 47536 exhibits a periodic variation of about 712 days with a semi-amplitude of 113 m s(-1). These variations are not accompanied by variations in either Ca II emission or in the spectral line shapes. A Keplerian orbit due to a sub-stellar companion is thus the most viable explanation for the radial velocity variation. Assuming a moderate stellar mass of m(1)=1.1-3.0 M-circle dot we obtain a minimum mass for the companion of m(2) sin i=5.0-9.7 M-Jup, an orbital semi-major axis of 1.6-2.3 AU, and an eccentricity of e=0.2.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据