Planets around the K-giants BD+20 274 and HD 219415

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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article number53
JournalAstrophysical Journal
Volume756
Issue number1
DOIs
StatePublished - Jan 1 2012

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planets
planet
giant stars
stars
eccentric orbits
stellar mass
Jupiter (planet)
Jupiter
radial velocity
telescopes
vibration

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Gettel, S., Wolszczan, A., Niedzielski, A., Nowak, G., Adamów, M., Zieliński, P., & MacIejewski, G. (2012). Planets around the K-giants BD+20 274 and HD 219415. Astrophysical Journal, 756(1), [53]. https://doi.org/10.1088/0004-637X/756/1/53
Gettel, S. ; Wolszczan, A. ; Niedzielski, A. ; Nowak, G. ; Adamów, M. ; Zieliński, P. ; MacIejewski, G. / Planets around the K-giants BD+20 274 and HD 219415. In: Astrophysical Journal. 2012 ; Vol. 756, No. 1.
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Gettel, S, Wolszczan, A, Niedzielski, A, Nowak, G, Adamów, M, Zieliński, P & MacIejewski, G 2012, 'Planets around the K-giants BD+20 274 and HD 219415', Astrophysical Journal, vol. 756, no. 1, 53. https://doi.org/10.1088/0004-637X/756/1/53

Planets around the K-giants BD+20 274 and HD 219415. / Gettel, S.; Wolszczan, A.; Niedzielski, A.; Nowak, G.; Adamów, M.; Zieliński, P.; MacIejewski, G.

In: Astrophysical Journal, Vol. 756, No. 1, 53, 01.01.2012.

Research output: Contribution to journalArticle

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Gettel S, Wolszczan A, Niedzielski A, Nowak G, Adamów M, Zieliński P et al. Planets around the K-giants BD+20 274 and HD 219415. Astrophysical Journal. 2012 Jan 1;756(1). 53. https://doi.org/10.1088/0004-637X/756/1/53