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Article overview
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Planet-planet scattering as the source of the highest eccentricity exoplanets | Daniel Carrera
; Sean R. Raymond
; Melvyn B. Davies
; | Date: |
6 Mar 2019 | Abstract: | 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. | Source: | arXiv, 1903.2564 | Services: | Forum | Review | PDF | Favorites |
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