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Title:
On the Equilibrium Figure of Close-in Planets and Satellites
Authors:
Correia, Alexandre C. M.; Rodríguez, Adrián
Affiliation:
AA(Departamento de Física, I3N, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal ; ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Avenue Denfert-Rochereau, F-75014 Paris, France), AB(Insituto de Astronomia, Geofísica e Ciências Atmosféricas, IAG-USP, Rua do Matão 1226, 05508-090 São Paulo, Brazil)
Publication:
The Astrophysical Journal, Volume 767, Issue 2, article id. 128, 5 pp. (2013). (ApJ Homepage)
Publication Date:
04/2013
Origin:
IOP
Astronomy Keywords:
celestial mechanics, planetary systems, planets and satellites: general, planets and satellites: physical evolution, planet-star interactions
DOI:
10.1088/0004-637X/767/2/128
Bibliographic Code:
2013ApJ...767..128C

Abstract

Many exoplanets have been observed close to their parent stars with orbital periods of a few days. As for the major satellites of the Jovian planets, the figure of these planets is expected to be strongly shaped by tidal forces. However, contrary to solar system satellites, exoplanets may present high values for the obliquity and eccentricity due to planetary perturbations, and may also be captured in spin-orbit resonances different from the synchronous one. Here we give a general formulation of the equilibrium figure of those bodies that makes no particular assumption on the spin and/or orbital configurations. The gravity field coefficients computed here are well suited for describing the figure evolution of a body whose spin and orbit undergo substantial variations in time.
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