Substellar-mass companions to the K-giants HD240237, BD +48 738, and HD96127

S. Gettel; A. Wolszczan; A. Niedzielski; G. Nowak; M. Adamów; P. Zieliński; G. MacIejewski

doi:10.1088/0004-637X/745/1/28

Substellar-mass companions to the K-giants HD240237, BD +48 738, and HD96127

S. Gettel, A. Wolszczan, A. Niedzielski, G. Nowak, M. Adamów, P. Zieliński, G. MacIejewski

Research output: Contribution to journal › Article › peer-review

Abstract

We present the discovery of substellar-mass companions to three giant stars by the ongoing Penn State-Toruń Planet Search conducted with the 9.2m Hobby-Eberly Telescope. The most massive of the three stars, K2-giant HD240237, has a 5.3 M_J minimum mass companion orbiting the star at a 746 day period. The K0-giant BD+48738 is orbited by a ≥0.91 M_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 HD96127 has a ≥4.0 M_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.

Original language	English (US)
Article number	28
Journal	Astrophysical Journal
Volume	745
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/745/1/28
State	Published - Jan 20 2012
Externally published	Yes

Keywords

brown dwarfs
planetary systems
stars: low-mass

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Online availability

10.1088/0004-637X/745/1/28

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abstract = "We present the discovery of substellar-mass companions to three giant stars by the ongoing Penn State-Toru{\'n} Planet Search conducted with the 9.2m Hobby-Eberly Telescope. The most massive of the three stars, K2-giant HD240237, has a 5.3 MJ minimum mass companion orbiting the star at a 746 day period. The K0-giant BD+48738 is orbited by a ≥0.91 MJ 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 HD96127 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.",

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author = "S. Gettel and A. Wolszczan and A. Niedzielski and G. Nowak and M. Adam{\'o}w and P. Zieli{\'n}ski and G. MacIejewski",

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AU - Gettel, S.

AU - Wolszczan, A.

AU - Niedzielski, A.

AU - Nowak, G.

AU - Adamów, M.

AU - Zieliński, P.

AU - MacIejewski, G.

PY - 2012/1/20

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N2 - We present the discovery of substellar-mass companions to three giant stars by the ongoing Penn State-Toruń Planet Search conducted with the 9.2m Hobby-Eberly Telescope. The most massive of the three stars, K2-giant HD240237, has a 5.3 MJ minimum mass companion orbiting the star at a 746 day period. The K0-giant BD+48738 is orbited by a ≥0.91 MJ 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 HD96127 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.

AB - We present the discovery of substellar-mass companions to three giant stars by the ongoing Penn State-Toruń Planet Search conducted with the 9.2m Hobby-Eberly Telescope. The most massive of the three stars, K2-giant HD240237, has a 5.3 MJ minimum mass companion orbiting the star at a 746 day period. The K0-giant BD+48738 is orbited by a ≥0.91 MJ 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 HD96127 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.

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Substellar-mass companions to the K-giants HD240237, BD +48 738, and HD96127

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