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

Robert A. Wittenmyer; M. I. Jones; Jonathan Horner; Stephen R. Kane; J. P. Marshall; A. J. Mustill; J. S. Jenkins; P. A.Pena Rojas; Jinglin Zhao; Eva Villaver; R. P. Butler; Jake Clark

doi:10.3847/1538-3881/aa9894

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

Robert A. Wittenmyer, M. I. Jones, Jonathan Horner, Stephen R. Kane, J. P. Marshall, A. J. Mustill, J. S. Jenkins, P. A.Pena Rojas, Jinglin Zhao, Eva Villaver, R. P. Butler, Jake Clark

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	274
Journal	The Astronomical Journal
Volume	154
Issue number	6
DOIs	https://doi.org/10.3847/1538-3881/aa9894
Publication status	Published - 2017 Dec 1

Subject classification (UKÄ)

Astronomy, Astrophysics and Cosmology

Free keywords

planetary systems
stars: evolution
stars: individual (HD 76920)
techniques: radial velocities

Access to Document

10.3847/1538-3881/aa9894

https://arxiv.org/abs/1711.05378Licence: Other

IMPACT: IMPACT: Comets, asteroids and the habitability of planets
Davies, M. B., Johansen, A. & Birger, S.
Knut and Alice Wallenberg Foundation
2015/07/01 → 2020/06/30
Project: Research

Cite this

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title = "The Pan-Pacific Planet Search. VII. the Most Eccentric Planet Orbiting a Giant Star",

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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AU - Wittenmyer, Robert A.

AU - Jones, M. I.

AU - Horner, Jonathan

AU - Kane, Stephen R.

AU - Marshall, J. P.

AU - Mustill, A. J.

AU - Jenkins, J. S.

AU - Rojas, P. A.Pena

AU - Zhao, Jinglin

AU - Villaver, Eva

AU - Butler, R. P.

AU - Clark, Jake

PY - 2017/12/1

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N2 - 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.

AB - 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.

KW - planetary systems

KW - stars: evolution

KW - stars: individual (HD 76920)

KW - techniques: radial velocities

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DO - 10.3847/1538-3881/aa9894

M3 - Article

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JO - The Astronomical Journal

JF - The Astronomical Journal

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ER -

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

Abstract

Subject classification (UKÄ)

Free keywords

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Projects

IMPACT: IMPACT: Comets, asteroids and the habitability of planets

Cite this