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Abstract: Tidal friction in exoplanet systems, driven by orbits that allow for durablenonzero eccentricities at short heliocentric periods, can generate internalheating far in excess of the conditions observed in our own solar system.Secular perturbations or a notional 2:1 resonance between a Hot Earth and HotJupiter can be used as a baseline to consider the thermal evolution ofconvecting bodies subject to strong viscoelastic tidal heating. We compareresults first from simple models using a fixed Quality factor and Love number,and then for three different viscoelastic rheologies: the Maxwell body, theStandard Anelastic Solid, and the Burgers body. The SAS and Burgers models areshown to alter the potential for extreme tidal heating by introducing thepossibility of new equilibria and multiple response peaks. We find that tidalheating tends to exceed radionuclide heating at periods below 10-30 days, andexceed insolation only below 1-2 days. Extreme cases produce enough tidal heatto initiate global-scale partial melting, and an analysis of tidal limitingmechanisms such as advective cooling for earthlike planets is discussed. Toexplore long term behaviors, we map equilibria points between convective heatloss and tidal heat input as functions of eccentricity. For the periods andmagnitudes discussed, we show that tidal heating, if significant, is generallydetrimental to the width of habitable zones.



Autor: Wade G. Henning, Richard J. O'Connell, Dimitar D. Sasselov

Fuente: https://arxiv.org/



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