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Title: The rotation of planets hosting atmospheric tides: From Venus to habitable super-Earths
Author: Auclair-Desrotour, P.
Laskar, J.
Mathis, S.
Correia, A. C. M.
Keywords: Celestial mechanics
Planet-star interactions
Planets and satellites: atmospheres
Planets and satellites: dynamical evolution and stability
Issue Date: Jul-2017
Publisher: EDP Sciences
Abstract: The competition between the torques induced by solid and thermal tides drives the rotational dynamics of Venus-like planets and super-Earths orbiting in the habitable zone of low-mass stars. The resulting torque determines the possible equilibrium states of the planet's spin. Here we have computed an analytic expression for the total tidal torque exerted on a Venus-like planet. This expression is used to characterize the equilibrium rotation of the body. Close to the star, the solid tide dominates. Far from it, the thermal tide drives the rotational dynamics of the planet. The transition regime corresponds to the habitable zone, where prograde and retrograde equilibrium states appear. We demonstrate the strong impact of the atmospheric properties and of the rheology of the solid part on the rotational dynamics of Venus-like planets, highlighting the key role played by dissipative mechanisms in the stability of equilibrium configurations. © ESO, 2017.
Peer review: yes
DOI: 10.1051/0004-6361/201628701
ISSN: 0004-6361
Appears in Collections:CIDMA - Artigos
DFis - Artigos
GGDG - Artigos

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