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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tidal evolution of exoplanetary systems hosting potentially habitable exoplanets. The cases of LHS-1140 b-c and K2-18 b-c

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Author(s):
Gomes, G. O. [1, 2] ; Ferraz-Mello, S. [1]
Total Authors: 2
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
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 type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 16/13750-6 - Brazil in space: Astrophysics and Engineering
Grantee:Eduardo Janot Pacheco
Support type: Research Projects - Thematic Grants
FAPESP's process: 19/21201-0 - Tidal evolution of exoplanets and host stars
Grantee:Gabriel de Oliveira Gomes
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)