Viscoelastic models of tidal heating in Encedalus

Mathematics – Logic

Scientific paper

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Astronomical Models, Enceladus, Orbital Resonances (Celestial Mechanics), Viscoelasticity, Eccentricity, Heating, Lithosphere, Satellite Surfaces, Turbulent Flow, Saturn, Satellites, Enceladus, Tidal Effects, Heating, Models, Layers, Elasticity, Dissipation, Eccentricity, Parameters, Lithosphere, Mantle, Conductivity, Viscosity, Temperature, Dynamics, Evolution, Diagrams

Scientific paper

Multilayered viscoelastic models of Encedalus are presently used to model its tidal heating, whose theoretical maximum violates an upper bound based on Saturn's Q. These multilayered models, which are demonstrably thermally stable at the current eccentricity with an about 10-km thick lithosphere, require a combination of near-surface insulation, subsurface solar heating, or anomalously low lithospheric conductivity, to accomodate both the dynamic and the geological constraints. The two- and three-layer models considered in detail suggest that the thermal and dynamical evolution of Encedalus may have been a very straightforward one that involved only Dione in a 2:1 resonance.

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