Old, rich, and eccentric

Two jovian planets orbiting evolved metal-rich stars

Kathryn M G Peek, John Asher Johnson, Debra A. Fischer, Geoffrey W. Marcy, Gregory W. Henry, Andrew W. Howard, Jason T. Wright, Thomas B. Lowe, Sabine Reffert, Christian Schwab, Peter K G Williams, Howard Isaacson, Matthew J. Giguere

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We present radial velocity measurements of two stars observed as part of the Lick Subgiants Planet Search and the Keck N2K survey. Variations in the radial velocities of both stars reveal the presence of Jupiter-mass exoplanets in highly eccentric orbits. HD 16175 is a G0 subgiant from the Lick Subgiants Planet Search, orbited by a planet having a minimum mass of 4:4 M Jup, in an eccentric (e= 0:59), 2.71 yr orbit. HD 96167 is a G5 subgiant from the N2K ("Next 2000") program at Keck Observatory, orbited by a planet having a minimum mass of 0:68 M Jup, in an eccentric (e=0:71), 1.366 yr orbit. Both stars are relatively massive (M z.ast; = 1:3 M⊙) and are very metal rich ([Fe/H]> +0:3). We describe our methods for measuring the stars' radial velocity variations and photometric stability.

Original languageEnglish
Pages (from-to)613-620
Number of pages8
JournalPublications of the Astronomical Society of the Pacific
Volume121
Issue number880
DOIs
Publication statusPublished - Jun 2009
Externally publishedYes

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