Article Dans Une Revue Planetary and Space Science Année : 2023

Viscosity contrasts in the Venus mantle from tidal deformations

Contraste de viscosités dans le manteau de Vénus des déformations de marée

Résumé

The tidal deformations of a planet are often considered as markers of its inner structure. In this work, we use the tide excitations induced by the Sun on Venus for deciphering the nature of its internal layers. In using a Monte Carlo Random Exploration of the space of parameters describing the thickness, density and viscosity of 4 or 5 layer profiles, we were able to select models that can reproduce the observed mass, total moment of inertia, k 2 Love number and expected quality factor Q. Each model is assumed to have homogeneous layers with constant density, viscosity and rigidity. These models show significant contrasts in the viscosity between the upper mantle and the lower mantle. They also rather favor a S-free core and a slightly hotter lower mantle consistent with previous expectations.

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hal-04111456 , version 1 (31-05-2023)

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Christelle Saliby, Agnès Fienga, Anthony Mémin, Anthony Mémin, Carianna Herrera. Viscosity contrasts in the Venus mantle from tidal deformations. Planetary and Space Science, 2023, 231, pp.105677. ⟨10.1016/j.pss.2023.105677⟩. ⟨hal-04111456⟩
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