期刊
ASTROPHYSICAL JOURNAL
卷 756, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/756/1/53
关键词
planetary systems; stars: individual (BD+20 274, HD 219415)
资金
- NASA [NNX09AB36G]
- Polish Ministry of Science and Higher Education grant [N203 510938, N203 386237]
- Polish Ministry of Science and Higher Education through Juventus Plus grant [IP2010 023070]
- Pennsylvania State University
- Eberly College of Science
- Pennsylvania Space Grant Consortium
- NASA [NNX09AB36G, 120947] Funding Source: Federal RePORTER
We present the discovery of planet-mass companions to two giant stars by the ongoing Penn State-Torun Planet Search conducted with the 9.2 m Hobby-Eberly Telescope. The less massive of these stars, K5-giant BD+20 274, has a 4.2 M-J minimum mass planet orbiting the star at a 578 day period and a more distant, likely stellar-mass companion. The best currently available model of the planet orbiting the K0-giant HD 219415 points to a greater than or similar to Jupiter-mass companion in a 5.7 year, eccentric orbit around the star, making it the longest period planet yet detected by our survey. This planet has an amplitude of similar to 18 m s(-1), comparable to the median radial velocity jitter, typical of giant stars.
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