DYNAMICS AND ORIGIN OF THE EXOPLANETARY SYSTEM HD 45364

CORREA OTTO, J.; MICHTCHENKO T.; BEAUGÉ C.

Aguas de Lindoia, Sao Paulo

Congreso; XVII Colóquio Brasileiro de Dinâmica Orbital - CBDO; 2014

Instituto Nacional de Pesquisas Espaciais - INPE

HD 45364 is the first discovered system with two massive planets evolving closely tothe 3/2 mean-motion resonance (MMR). In this work we present a dynamical andcosmogonical study of the HD 45364 system. The main topics of our analysis are: i) thecomplete comprehension of the planetary evolution in the vicinity and inside the 3/2 MMR,and ii) the elaboration of a possible scenario of the formation for systems in the 3/2 MMR.We develop a detailed analysis of the topology of the planar planetary 3/2 mean-motionresonance considering the planetary and star masses of the HD 45364 system. The phasespace of the resonance and near-resonance regions is studied by means of surfaces ofsection and spectral analysis techniques. We found several possible regimes of motion;domains of transition between distinct regimes of motion are characterized by chaoticbehaviour of the planets.Finally, based on results of the detailed analysis of the phase space in the vicinity of the3/2 MMR, we develop a new scenario for the formation of the HD45364 exoplanetarysystem. Our scenario includes an interaction between different planetary migration types,planet growth and gap formation in the protoplanetary disk. The outcomes of oursimulations are able to very closely reproduce the best-fit solution obtained by Correia et al.(2009).