Carolina Charalambous (Université de Namur)

Title: Dynamical analysis of resonant multi-planet systems

Throughout this seminar, I intend to cover some of the general problems observed in the extrasolar population as a consequence of their dynamical evolution.
For this purpose, I will first present some planetary features and discuss in which context the planets were formed to obtain the currently observed architectures.
The focus will be on systems with 3-planets. The interest comes after the discovery of the TRAPPIST-1 system.
To carry out this investigation, we used N-body numerical simulations to study in detail the evolution of planetary systems during the early stages of planet formation, that is, when there was still gas in the protoplanetary disk. We make dynamical maps from grids of initial conditions for systems with planets of different masses and compare the results of the N-body simulations with the analytical modeling to understand the evolutionary paths, on which parameters of the disk depend, and other physical characteristics. We dynamically analyze the TRAPPIST-1 planetary system that lies in a very complex resonant configuration. Results are consistent with the fact that systems were not formed in-situ but had to migrate to reach their current positions, without having to suppose ad-hoc dissipative effects, such as tidal effects by the star.