期刊
ASTROPHYSICAL JOURNAL
卷 745, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/745/1/28
关键词
brown dwarfs; planetary systems; stars: individual (HD 240237, BD+48 738, HD 96127); stars: low-mass
资金
- HET
- NASA [NNX09AB36G]
- Polish Ministry of Science and Higher Education [N N203 510938, N N203 386237, IP2010 023070]
- Eberly College of Science
- Pennsylvania Space Grant Consortium
- Pennsylvania State University
- NASA [NNX09AB36G, 120947] Funding Source: Federal RePORTER
We present the discovery of substellar-mass companions to three giant stars by the ongoing Penn State-Torun Planet Search conducted with the 9.2 m Hobby-Eberly Telescope. The most massive of the three stars, K2-giant HD 240237, has a 5.3M(J) minimum mass companion orbiting the star at a 746 day period. The K0-giant BD +48 738 is orbited by a >= 0.91M(J) planet which has a period of 393 days and shows a nonlinear, long-term radial velocity (RV) trend that indicates a presence of another, more distant companion, which may have a substellar mass or be a low-mass star. The K2-giant HD 96127 has a >= 4.0M(J) mass companion in a 647 day orbit around the star. The two K2-giants exhibit a significant RV noise that complicates the detection of low-amplitude, periodic variations in the data. If the noise component of the observed RV variations is due to solar-type oscillations, we show, using all the published data for the substellar companions to giants, that its amplitude is anti-correlated with stellar metallicity.
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