Abstract
Our knowledge of planets' orbital dynamics, which was based on Solar
System studies, has been challenged by the diversity of exoplanetary
systems. Around cool and ultra cool dwarfs, the influence of tides on
the orbital and spin evolution of planets can strongly affect their
climate and their capacity to host surface liquid water. We illustrate
the role of tides and dynamics with the extreme case of planets orbiting
around brown dwarfs. In multiple planet systems, the eccentricity is
excited by planet-planet interactions. Planets are therefore heated up
from the inside by the tidally-induced friction. This process can heat a
habitable zone planet to such a level that surface liquid water cannot
exist. We also talk about the newly discovered potentially habitable
Earth-sized planet Kepler-186f. Given the poorly estimated age of the
system, the planet could still be evolving towards synchronization and
have a high obliquity or be pseudo-synchronized with a zero obliquity.
These two configurations would have a different effect on the climate of
this planet.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the annual meeting of the French Society of Astronomy & Astrophysics |
| Subtitle of host publication | Paris, June 3-6, 2014 |
| Editors | J. Ballet, F. Bournaud, F. Martins, R. Monier, C. Reylé |
| Publisher | Société Française d'Astronomie et d'Astrophysique |
| Pages | 63-68 |
| Publication status | Published - 2014 |
Keywords
- Planets and satellites: atmospheres
- Planets and satellites: dynamical evolution and stability
- Planets and satellites: individual: Kepler-186f
