The anelastic equilibrium tide in exoplanetary systems
Abstract
Earth-like planets have anelastic mantles, whereas giant planets may have anelastic cores. As for the fluid parts of a body, the tidal dissipation of such solid regions, gravitationally perturbed by a companion body, highly depends on its internal friction, and thus on its internal structure. Therefore, modelling this kind of interaction presents a high interest to provide constraints on planet interiors, whose properties are still quite uncertain. Here, we examine the equilibrium tide in the solid central region of a planet, taking into account the presence of a fluid envelope. We discuss how the quality factor Q depends on the rheological parameters, and the size of the core. Taking plausible values for the anelastic parameters, and examinig the frequency-dependence of the solid dissipation, we show how this mechanism may compete with the dissipation in fluid layers, when applied to Jupiter- and Saturn-like planets. We also discuss the case of the icy giants Uranus and Neptune.
- Publication:
-
SF2A-2012: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
- Pub Date:
- December 2012
- DOI:
- 10.48550/arXiv.1208.0377
- arXiv:
- arXiv:1208.0377
- Bibcode:
- 2012sf2a.conf..245R
- Keywords:
-
- planetary systems;
- dynamical evolution and stability;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- 5 pages, 3 figures, proceeding of the SF2A-2012 conference: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 20-23, 2012