EFEITOS DA INSTABILIDADE DOS PLANETAS GIGANTES NA EVOLUÇÃO DINÂMICA DOS PLANETAS TERRESTRES

Abstract

Title: Instability effects of giant planets on the dynamic evolution of terrestrial planets Abstract: In this thesis, we present studies on the effects of planetary migration in jumping-Jupiter models. Based on a variant of the Nice model, which includes five ice giants, we investigate two important problems, not yet well understood, in the context of the formation and evolution of the Solar System: the peculiarities of Mercury’s orbit and the origin of the Moon. That the instability in the evolution of giant planets, during planetary migration, reproduces the unique characteristics of Mercury’s orbit, while preserving the dynamic structure of the other planets. We also found that this period of instability provides an environment that increases the chances of collisions between protoplanets, thus allowing a giant impact as the cause of the Moon’s origin. Among these impacts, the collision between two half-earths was more likely than the collision between a proto-earth and a proto-mars. Understanding these problems provides important links for the correct understanding of the evolution of the Solar System and, therefore, a better interpretation of the many recently discovered extrasolar systems.