TY - JOUR
T1 - Planets around the K-giants BD+20 274 and HD 219415
AU - Gettel, S.
AU - Wolszczan, A.
AU - Niedzielski, A.
AU - Nowak, G.
AU - Adamów, M.
AU - Zieliński, P.
AU - MacIejewski, G.
PY - 2012
Y1 - 2012
N2 - We present the discovery of planet-mass companions to two giant stars by the ongoing Penn State-Toruń Planet Search conducted with the 9.2m Hobby-Eberly Telescope. The less massive of these stars, K5-giant BD+20 274, has a 4.2 MJ minimum mass planet orbiting the star at a 578day 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 ≳ 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 ∼18ms-1, comparable to the median radial velocity "jitter," typical of giant stars.
AB - We present the discovery of planet-mass companions to two giant stars by the ongoing Penn State-Toruń Planet Search conducted with the 9.2m Hobby-Eberly Telescope. The less massive of these stars, K5-giant BD+20 274, has a 4.2 MJ minimum mass planet orbiting the star at a 578day 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 ≳ 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 ∼18ms-1, comparable to the median radial velocity "jitter," typical of giant stars.
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U2 - 10.1088/0004-637X/756/1/53
DO - 10.1088/0004-637X/756/1/53
M3 - Article
AN - SCOPUS:84865170322
SN - 0004-637X
VL - 756
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 53
ER -