CARRERA, Daniel; RAYMOND, Sean N.; DAVIES, Melvyn B.

doi:10.1051/0004-6361/201935744

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CARRERA, Daniel

RAYMOND, Sean N.
ECLIPSE 2019

DAVIES, Melvyn B.
Lund Observatory

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Astronomy and Astrophysics - A&A. 2019, vol. 629, p. L7

EDP Sciences

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Most giant exoplanets discovered by radial velocity surveys have much higher eccentricities than those in the Solar System. The planet-planet scattering mechanism has been shown to match the broad eccentricity distribution, but the highest-eccentricity planets are often attributed to Kozai-Lidov oscillations induced by a stellar companion. Here we investigate whether the highly eccentric exoplanet population can be produced entirely by scattering. We ran 500 N-body simulations of closely packed giant planet systems that became unstable under their own mutual perturbations. We find that the surviving bound planets can have eccentricities up to $e > 0.99$. In other words, there is no maximum eccentricity that can be produced by planet-planet scattering. Furthermore, the eccentricity distribution for all giant exoplanets with $e > 0.3$ is consistent with it all being generated by scattering. Our results show that the discovery of planets with extremely high eccentricities does not necessarily signal the action of the Kozai-Lidov mechanism.< Réduire

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Astrophysics - Earth and Planetary Astrophysics

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Planet-planet scattering as the source of the highest eccentricity exoplanets

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