The Pan-Pacific planet search. VII. The most eccentric planet orbiting a giant star

Wittenmyer, Robert A. and Jones, M. I. and Horner, Jonathan and Kane, Stephen R. and Marshall, J. P. and Mustill, A. J. and Jenkins, J. S. and Pena Rojas, P. A. and Zhao, Jinlin and Villaver, Eva and Butler, R. P. and Clark, Jake (2017) The Pan-Pacific planet search. VII. The most eccentric planet orbiting a giant star. The Astronomical Journal, 154 (6 - Article 274). ISSN 0004-6256

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 27 Sep 2018 03:03
Last Modified: 02 Oct 2018 03:47
Uncontrolled Keywords: extrasolar planets; planetary systems; HD 76920; radial velocities
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl. Extraterrestrial Geology)
Identification Number or DOI: 10.3847/1538-3881/aa9894
URI: http://eprints.usq.edu.au/id/eprint/34876

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