Stability and diffusion in multi-resonant planetary systems

MARTI, JAVIER GUILLERMO; CINCOTTA, PABLO MIGUEL; BEAUGÉ, CHRISTIÁN

Aguas do Lindoia

Congreso; XVIII Coloquio brasilero de dinámica orbital; 2016

UNESP

In this work we aim to analize the role of chaotic diffusion on the fundamental parameters of a multi-resonant planetary system. With this in mind, we used as primary target of this type of resonantconfiguration the paradigmatic GJ-876 exoplanetary system, being as today the most feassible case of exoplanetary system involved in a Laplace resonant configuration. We implemented a numericalapproach to the problem, constructing a set of stability maps in the surrounding regions of the Laplace resonance, we numerically integrate ensambles of close initial conditions, compute Poincaré mapsand estimate the chaotic diffusion present in this system. We were able to qualitatively characterize the diffusion along the (a, e) parameters of the outermost planet of the system, and perform astability analysis of the inherent chaotic, albeit stable Laplace resonance.