Tidal evolution of the rotation of stars hosting massive planets
Exoplanets, Habitable Zone and Comparative Anatomy of Atmospheres
A rheological model for the deformation and orbital dynamics of celestial bodies
| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] IAG USP, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508900 Sao Paulo - Brazil
[2] Univ Geneva, Observ Geneve, 51 Chemin Maillettes, CH-1290 Sauverny - Switzerland
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 494, n. 4, p. 5082-5090, JUN 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
We present a model to study secularly and tidally evolving three-body systems composed by two low-mass planets orbiting a star, in the case where the bodies rotation axes are always perpendicular to the orbital plane. The tidal theory allows us to study the spin and orbit evolution of both stiff Earth-like planets and predominantly gaseous Neptune-like planets. The model is applied to study two recently discovered exoplanetary systems containing potentially habitable exoplanets (PHE): LHS-1140 b-c and K2-18 b-c. For the former system, we show that both LHS-1140 b and c must be in nearly circular orbits. For K2-18 b-c, the combined analysis of orbital evolution time-scales with the current eccentricity estimation of K2-18 b allows us to conclude that the inner planet (K2-18 c) must be a Neptune-like gaseous body. Only this would allow for the eccentricity of K2-18 b to be in the range of values estimated in recent works (e = 0.20 +/- 0.08), provided that the uniform viscosity coefficient of K2-18 b is greater than 2.4 x 10(19) Pa s (which is a value characteristic of stiff bodies) and supposing that such system has an age of some Gyr. (AU) | |
| FAPESP's process: | 17/25224-0 - Application of the planetary tides theory to exoplanets and planetary satellites |
| Grantee: | Gabriel de Oliveira Gomes |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 16/13750-6 - Brazil in space: Astrophysics and Engineering |
| Grantee: | Eduardo Janot Pacheco |
| Support Opportunities: | Special Projects |
| FAPESP's process: | 19/21201-0 - Tidal evolution of exoplanets and host stars |
| Grantee: | Gabriel de Oliveira Gomes |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate (Direct) |