Astrophys. J., 745, 28 (2012/January-3)
Substellar-mass companions to the K-giants HD 240237, BD +48 738, and HD 96127.
GETTEL S., WOLSZCZAN A., NIEDZIELSKI A., NOWAK G., ADAMOW M., ZIELINSKI P. and MACIEJEWSKI G.
Abstract (from CDS):
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 5.3 MJ minimum mass companion orbiting the star at a 746 day period. The K0-giant BD +48 738 is orbited by a ≥ 0.91 MJplanet 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 ≥ 4.0 MJ 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.
brown dwarfs - planetary systems - stars: individual (HD 240237, BD +48 738, HD 96127) - stars: low-mass
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