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Tidal dissipation and eccentricity pumping: Implications for the depth of the secondary eclipse of 55 Cnc e

hal.structure.identifierSSE 2013
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorBOLMONT, Emeline
hal.structure.identifierSSE 2013
dc.contributor.authorSELSIS, Franck
hal.structure.identifierSSE 2013
dc.contributor.authorRAYMOND, Sean N.
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorLECONTE, Jeremy
hal.structure.identifierFORMATION STELLAIRE 2013
dc.contributor.authorHERSANT, F.
hal.structure.identifierSSE 2013
dc.contributor.authorMAURIN, A. S.
hal.structure.identifierAMOR 2013
dc.contributor.authorPERICAUD, J.
dc.date.created2013-04-01
dc.date.issued2013
dc.identifier.issn0004-6361
dc.description.abstractEnWe use the super Earth 55 Cnc e as a case study to address an observable effect of tidal heating. We investigate whether planet-planet interactions can force the eccentricity of this planet to a level affecting the eclipse depth observed with Spitzer. Using the constant time lag tidal model, we first calculate the observed planet flux as a function of albedo and eccentricity, for different tidal dissipation constants and for two extreme cases: a planet with no heat redistribution and a planet with full heat redistribution. We derive the values of albedo and eccentricity that match the observed transit depth. We then perform N-body simulations of the planetary system including tides and General Relativity to follow the evolution of the eccentricity of planet e. We compare the range of eccentricities given by the simulations with the eccentricities required to alter the eclipse depth. We find that the eccentricity of planet e can be large enough to contribute at a measurable level to the thermal emission measured with Spitzer. This affects the constraints on the albedo of the planet, which can be as high as 0.9 (instead of 0.55 when ignoring tidal heating). We also derive a maximum value for the eccentricity of planet e directly from the eclipse depth: e<0.015 assuming Earth's dissipation constant. Transiting exoplanets in multiple planet systems are exceptional targets for testing tidal models because their tidal luminosity may be observable. Future multi-wavelengths observations of eclipse depth and phase curves (for instance with EChO and JWST) should allow us to better resolve the temperature map of these planets and break the degeneracy between albedo and tidal heating that remains for single band observations. In addition, an accurate determination of the eccentricity will make it possible to constrain the dissipation rate of the planet and to probe its internal structure.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enEarth and Planetary Astrophysics
dc.subject.enAstrophysics
dc.title.enTidal dissipation and eccentricity pumping: Implications for the depth of the secondary eclipse of 55 Cnc e
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201220837
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv1304.0459
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A17
bordeaux.volume556
bordeaux.peerReviewedoui
hal.identifierhal-00811426
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00811426v1
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