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Title:
Coupled orbital and spin evolution of the CoRoT-7 two-planet system using a Maxwell viscoelastic rheology
Authors:
Rodríguez, A.; Callegari, N.; Correia, A. C. M.
Affiliation:
AA(Universidade Federal do Rio de Janeiro, Observatório do Valongo, Ladeira do Pedro Antônio 43, 20080-090 Rio de Janeiro, Brazil ), AB(Instituto de Geociências e Ciências Exatas, Unesp-Univ Estadual Paulista, Av. 24-A, 1515, 13506-900 Rio Claro, SP, Brazil), AC(CIDMA, Departamento de Física, Universidade de Aveiro, Campus de Santiago, P-3810-193 Aveiro, Portugal; ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, 77 Av. Denfert-Rochereau, F-75014 Paris, France)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 463, Issue 3, p.3249-3259 (MNRAS Homepage)
Publication Date:
12/2016
Origin:
OUP
Astronomy Keywords:
planets and satellites: dynamical evolution and stability, planet-star interactions
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw2221
Bibliographic Code:
2016MNRAS.463.3249R

Abstract

We investigate the orbital and rotational evolution of the CoRoT-7 two-planet system, assuming that the innermost planet behaves like a Maxwell body. We numerically resolve the coupled differential equations governing the instantaneous deformation of the inner planet together with the orbital motion of the system. We show that, depending on the relaxation time for the deformation of the planet, the orbital evolution has two distinct behaviours: for relaxation times shorter than the orbital period, we reproduce the results from classic tidal theories, for which the eccentricity is always damped. However, for longer relaxation times, the eccentricity of the inner orbit is secularly excited and can grow to high values. This mechanism provides an explanation for the present high eccentricity observed for CoRoT-7 b, as well as for other close-in super-Earths in multiple planetary systems.
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