Effects of a free-floating object over small body populations of a planetary system

DARRIBA, LUCIANO ARIEL; DE ELIA, GONZALO; ZANARDI, MACARENA; DUGARO, AGUSTÍN

Coyhaique

Congreso; Astrobiology 2017; 2017

Unión Astronómica Internacional

It is known that a planet-planet scattering event between two gaseous giants may remove one of them from the system, while leaving the other in a highly eccentric orbit. This eccentric giant perturbs considerably the small bodies disk of a planetary system, by removing efficiently those small bodies (Zanardi et al. 2017). It may also produce the so-called type F particles, in which their orbits oscillates from retrograde to direct during their evolution. An alternative mechanism to produce eccentric giants might be a free floating object (FFO) flying-by over a planetary system. In this work we analyse the effects over a planetary system when a wandering celestial body enters in a parabollic orbit, and the dynamical evolution of the system after the fly-by takes place. The system is constituted by a Solar mass and metallicity central star, a bound giant in circular orbit and an external small bodies disk. We also study a range of masses and impact parameter for the FFO. We then have two large group of results. On the one hand, the fly-by event leaves a wide variety of eccentricities for the bound giant. On the other hand, in the long term evolution, the different scenarios produce smaller removal rates of the small bodies than a scattering event, producing long term debris disks. We also found that there is a very low efficiency for the generation of type F particles. This two features might help to discern if an observable eccentric giant was generated by a scattering or a fly-by event.