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

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 un...

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Veröffentlicht in:	The Astronomical journal 2017-12, Vol.154 (6), p.274
Hauptverfasser:	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
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomi, astrofysik och kosmologi Astronomy Astronomy, Astrophysics and Cosmology Binary stars Companion stars Eccentric orbits Extrasolar planets Fysik Giant stars Natural Sciences Naturvetenskap Physical Sciences Planetary orbits planetary systems Planets Radial velocity stars: evolution stars: individual (HD 76920) Stellar evolution techniques: radial velocities
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Zusammenfassung:	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.
ISSN:	0004-6256 1538-3881
DOI:	10.3847/1538-3881/aa9894