A new scenario for the origin of the 3/2 resonant system HD45364

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

Heidelberg

Congreso; Protostars and Planets VI; 2013

In this paper we revise the model proposed by Rein et al. (2010) for the origin of the HD45364 exoplanetary system, currently known to host two planets locked in a 3/2 mean-motion commensurability (MMR). We show that, due to high surface density of the protoplanetary disk needed for Type III migration, such a process could only lead to planets in a quasi-resonant regime of motion, and thus not consistent with the motion of the real system. Here we present a different scenario; it includes an interaction between different (but slower) planetary migration types. The outcomes of our simulations are able to reproduce very closely the 3/2 resonant dynamics obtained from the best-fit presented by Correia et al. (2009). We also analyze the structure of the ph ase space in the vicinity of the 3/2 MMR employing a semi-analytical Hamiltonian model.