Défense de thèse de doctorat en sciences mathématiques, par Sotiris Sotiriadis

Formation of non-coplanar planetary systems

Jury

Véronique DEHANT (ROB), Alessandro MORBIDELLI (Observatoire de Nice), Kleomenis TSIGANIS (Aristotle University of Thessaloniki), Timoteo CARLETTI, président (UNamur), Anne LEMAITRE, co-promoteur (UNamur),  Anne-Sophie LIBERT, promoteur (UNamur)

Résumé

Thousands of exoplanets have been detected over the last two decades. Their orbital parameters are very diversified compared to the quasi-circular and quasi-coplanar orbits of the planets of our own system. The necessity arises to face our theoretical understanding of the formation mechanisms, until recently designed for the Solar System, by taking into account the constrains set by the recent discoveries. In our study we address partially this issue, by focusing on the dynamical mechanisms that produce three-dimensional planetary systems. The first part of our work is devoted to the formation of giant planetary systems, during the early stages of the systems’ lifetime where both planet-planet interactions and interactions with their natal protoplanetary disc play a key role on the final architecture of the systems. In particular, we highlight the importance of the inclination-type resonance during the migration of giant planets with low to moderate or high eccentricities. In the second part, we study the impact of migrating giant planets onto the terrestrial accretion process, showing that terrestrial planets can form on stable inclined orbits through the classical accretion theory.

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