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Title: Spin evolution of Earth-sized exoplanets, including atmospheric tides and core-mantle friction
Author: Cunha, Diana
Correia, Alexandre C. M.
Laskar, Jacques
Keywords: Atmospheres
Dynamical evolution and stability
Planets and satellites
Issue Date: Apr-2015
Publisher: Cambridge University Press
Abstract: Planets with masses between 0.1 and 10M(circle plus) are believed to host dense atmospheres. These atmospheres can play an important role on the planet's spin evolution, since thermal atmospheric tides, driven by the host star, may counterbalance gravitational tides. In this work, we study the long-term spin evolution of Earth-sized exoplanets. We generalize previous works by including the effect of eccentric orbits and obliquity. We show that under the effect of tides and core-mantle friction, the obliquity of the planets evolves either to 0 degrees or 180 degrees. The rotation of these planets is also expected to evolve into a very restricted number of equilibrium configurations. In general, none of these equilibria is synchronous with the orbital mean motion. The role of thermal atmospheric tides becomes more important for Earth-sized planets in the habitable zones of their systems; so they cannot be neglected when we search for their potential habitability.
Peer review: yes
DOI: 10.1017/S1473550414000226
ISSN: 1473-5504
Appears in Collections:CIDMA - Artigos
DFis - Artigos
GGDG - Artigos

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