https://doi.org/10.1140/epjs/s11734-025-01910-7
Regular Article
Tidal dissipation and synchronization of the temperate exo-Earth LP 791-18d
Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, 05508-090, São Paulo, SP, Brasil
a
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Received:
5
April
2025
Accepted:
1
September
2025
Published online:
9
September
2025
Abstract
The creep-tide theory is used to explore several aspects of the tidal evolution of the planetary system of the M-star LP 791-18. We discuss the early synchronization of the exo-Earth LP 791-18d and show that the trapping of its rotation in a 3:2 spin–orbit resonance would only have been possible if its eccentricity were approximately 0.04 or larger. The planet is likely in synchronous rotation. The perturbations of the other planets in the system do not allow the complete damping of the orbital eccentricity, and the resulting mechanical energy balance indicates that the tidal energy dissipated inside the planet may flow through the planetary surface at approximately 1 
.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
