The Pan-Pacific Planet Search. VII. the Most Eccentric Planet Orbiting a Giant Star
Author
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Wittenmyer, Robert A.
Author
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Jones, M. I.
Author
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Horner, Jonathan
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Kane, Stephen R.
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Marshall, J. P.
Author
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Mustill, A. J.
Author
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Jenkins, James Stewart
Author
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Pena Rojas, P. A.
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Zhao, Jinglin
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Villaver, Eva
Author
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Butler, R. P.
Author
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Clark, Jake
Admission date
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2019-05-29T13:41:16Z
Available date
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2019-05-29T13:41:16Z
Publication date
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2017
Cita de ítem
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Astronomical Journal, 154:274 (13pp), 2017 December
Identifier
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00046256
Identifier
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10.3847/1538-3881/aa9894
Identifier
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https://repositorio.uchile.cl/handle/2250/169106
Abstract
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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.