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Title:
Pumping the Eccentricity of Exoplanets by Tidal Effect
Authors:
Correia, Alexandre C. M.; Boué, Gwenaël; Laskar, Jacques
Affiliation:
AA(Department of Physics, I3N, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal ; Astronomie et Systèmes Dynamiques, IMCCE-CNRS UMR8028, 77 Av. Denfert-Rochereau, 75014 Paris, France ; ), AB(Astronomie et Systèmes Dynamiques, IMCCE-CNRS UMR8028, 77 Av. Denfert-Rochereau, 75014 Paris, France ; Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal), AC(Astronomie et Systèmes Dynamiques, IMCCE-CNRS UMR8028, 77 Av. Denfert-Rochereau, 75014 Paris, France )
Publication:
The Astrophysical Journal Letters, Volume 744, Issue 2, article id. L23, 5 pp. (2012). (ApJL Homepage)
Publication Date:
01/2012
Origin:
IOP
Astronomy Keywords:
celestial mechanics, planetary systems, planets and satellites: general
DOI:
10.1088/2041-8205/744/2/L23
Bibliographic Code:
2012ApJ...744L..23C

Abstract

Planets close to their host stars are believed to undergo significant tidal interactions, leading to a progressive damping of the orbital eccentricity. Here we show that when the orbit of the planet is excited by an outer companion, tidal effects combined with gravitational interactions may give rise to a secular increasing drift on the eccentricity. As long as this secular drift counterbalances the damping effect, the eccentricity can increase to high values. This mechanism may explain why some of the moderate close-in exoplanets are observed with substantial eccentricity values.
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