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Alexander Mustill. Profile picture.

Alexander Mustill

Researcher

Alexander Mustill. Profile picture.

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

Author

  • 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

Summary, in English

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.

Department/s

  • Lund Observatory

Publishing year

2017-12-01

Language

English

Publication/Series

The Astronomical Journal

Volume

154

Issue

6

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

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

Status

Published

Project

  • IMPACT: Comets, asteroids and the habitability of planets

ISBN/ISSN/Other

  • ISSN: 0004-6256