The Pan-Pacific Planet Search. VII. the Most Eccentric Planet Orbiting a Giant Star

Robert A. Wittenmyer, M. I. Jones, Jonathan Horner, Stephen R. Kane, J. P. Marshall, A. J. Mustill, J. S. Jenkins, P. A.Pena Rojas, Jinglin Zhao, Eva Villaver, R. P. Butler, Jake Clark

Research output: Contribution to journalArticlepeer-review

23 Citations (SciVal)

Abstract

Radial velocity observations from three instruments reveal the presence of a 4 M Jup planet candidate orbiting the K giant HD 76920. HD 76920b has an orbital eccentricity of 0.856 ±0.009, making it the most eccentric planet known to orbit an evolved star. There is no indication that HD 76920 has an unseen binary companion, suggesting a scattering event rather than Kozai oscillations as a probable culprit for the observed eccentricity. The candidate planet currently approaches to about four stellar radii from its host star, and is predicted to be engulfed on a ∼100 Myr timescale due to the combined effects of stellar evolution and tidal interactions.

Original languageEnglish
Article number274
JournalThe Astronomical Journal
Volume154
Issue number6
DOIs
Publication statusPublished - 2017 Dec 1

Subject classification (UKÄ)

  • Astronomy, Astrophysics and Cosmology

Keywords

  • planetary systems
  • stars: evolution
  • stars: individual (HD 76920)
  • techniques: radial velocities

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