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
Original · EN
Radial velocity observations from three instruments reveal the presence of a 4 Mⱼup 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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