Tidal dissipation and synchronization of the temperate exo-Earth LP 791-18d
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918115099541504 |
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| author | Ferraz-Mello, Sylvio Bechara, Thayná Menezes Alves-Silva, Raphael |
| author_facet | Ferraz-Mello, Sylvio Bechara, Thayná Menezes Alves-Silva, Raphael |
| contents | 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 watt per square meter. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_13621 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tidal dissipation and synchronization of the temperate exo-Earth LP 791-18d Ferraz-Mello, Sylvio Bechara, Thayná Menezes Alves-Silva, Raphael Earth and Planetary Astrophysics 37N05 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 watt per square meter. |
| title | Tidal dissipation and synchronization of the temperate exo-Earth LP 791-18d |
| topic | Earth and Planetary Astrophysics 37N05 |
| url | https://arxiv.org/abs/2506.13621 |