The Pan-Pacific Planet Search. VII. the Most Eccentric Planet Orbiting a Giant Star
- Wittenmyer, Robert A.
- Jones, M. I.
- Horner, Jonathan
- Kane, Stephen R.
- Marshall, J. P.
- Mustill, A. J.
- Jenkins, J. S.
- Rojas, P. A.Pena
- Zhao, Jinglin
- Villaver, Eva
- Butler, R. P.
- Clark, Jake
DOIAbstract
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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