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

dc.contributor.authorCARRERA, Daniel
hal.structure.identifierECLIPSE 2019
dc.contributor.authorRAYMOND, Sean N.
hal.structure.identifierLund Observatory
dc.contributor.authorDAVIES, Melvyn B.
dc.date.issued2019
dc.identifier.issn0004-6361
dc.description.abstractEnMost 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.
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enAstrophysics - Earth and Planetary Astrophysics
dc.title.enPlanet-planet scattering as the source of the highest eccentricity exoplanets
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201935744
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPlanète et Univers [physics]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageL7
bordeaux.volume629
bordeaux.peerReviewedoui
hal.identifierhal-02061451
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02061451v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2019&rft.volume=629&rft.spage=L7&rft.epage=L7&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=CARRERA,%20Daniel&RAYMOND,%20Sean%20N.&DAVIES,%20Melvyn%20B.&rft.genre=article


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