4.6 Article

Homogeneous model for the TRAPPIST-1e planet with an icy layer

期刊

ASTRONOMY & ASTROPHYSICS
卷 650, 期 -, 页码 -

出版社

EDP SCIENCES S A
DOI: 10.1051/0004-6361/202140736

关键词

planets and satellites: terrestrial planets; planets and satellites: interiors; celestial mechanics

资金

  1. FAPESP, Brazil [2019/25356-9]

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This study investigates whether a multilayered planet can be approximated as a homogeneous planet and how well the dissipation rate of a multilayered planet can be reproduced with a homogeneous rheology. The results show that it is possible to approximate the behavior of a multilayer icy planet with a homogeneous planet using the Sundberg-Cooper rheology, highlighting the fact that the complexity of a multilayer planet model is not necessary to estimate the tidal dissipation of an icy planet.
In this work, we investigate whether a multilayered planet can be approximated as a homogeneous planet, and in particular how well the dissipation rate of a multilayered planet can be reproduced with a homogeneous rheology. We study the case of a stratified body with an icy crust that, according to recent studies, displays a double peak feature in the tidal response that cannot be reproduced with a homogeneous planet with an Andrade rheology. We revisit the problem with a slightly more complex rheology for the homogeneous body, the Sundberg-Cooper rheology, which naturally has a double peak feature, and apply the model to the TRAPPIST-1e planet. Our results compare very well with the results obtained when employing a multilayered model, showing that it is possible to approximate the behavior of a multilayer icy planet with a homogeneous planet using the Sundberg-Cooper rheology. This highlights the fact that we do not need the complexity of the multilayer planet model in order to estimate the tidal dissipation of an icy planet.

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