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Défense de thèse en sciences mathématiques

Giant planet dynamical evolution in binary star systems

Catégorie : défense de thèse
Date : 28/06/2021 16:00 - 28/06/2021 19:00
Lieu : S01
Orateur(s) : Arnaud ROISIN
Organisateur(s) : Anne-Sophie LIBERT


  • LEMAÎTRE Anne (UNamur), présidente
  • LIBERT Anne-Sophie (UNamur), promotrice et secrétaire
  • RAYMOND Sean (Université de Bordeaux)
  • TSIGANIS Kleomenis (Aristotle University of Thessaloniki)
  • CRIDA Aurélien (Université Côte d’Azur)
  • TEYSSANDIER Jean (UNamur)


There is a growing number of giant planets discovered moving around one stellar component of a binary star, most of which have very diverse eccentricity. These discoveries raise the question of their formation and long-term evolution because the stellar companion can strongly affect the planet formation process. In this work, by means of a symplectic integrator designed for binary star systems, we study the dynamical influence of a wide binary companion on the evolution of giant planets during their migration in the protoplanetary disk and their long-term evolution after the dispersal of the disk. In particular, we highlight the importance of the Lidov-Kozai resonance for highly inclined binary companions. In the first part, the effects of the disk gravitational potential and the disk nodal precession induced by the binary companion are discussed. In the second part, the mean motion resonance captures of the planets during the migration phase are studied. We finally show how our work can explain several features of the detected circumprimary planets, such as the high eccentricities and the spin-orbit misalignment.


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