Impacts on Ceres and Vesta

ZAIN, PATRICIO S.; DI SISTO, ROMINA P.; DE ELÍA, GONZALO CARLOS

Congreso; 11th Planetary Crater Consortium Meeting; 2020

Lunar and Planetary Institute Universities Space Research Association

We perform a collisional study of Ceres and Vesta, using a new multi-part collisional evolution model of the main belt (MB) called ACDC [1]. We split the MB in six regions, namely Inner, Middle, Pristine, Outer, Cybele and High-Inclination, according to the positions of the major resonances present in there [2]. The ACDC simulates the collisional and dynamical evolution of the MB, by evolving in time the incremental SFDs in each of the defined regions in 4 Gyr. The collisional component is determined by the change in the number of bodies due to the objects destroyed and fragments ejected in collisions. From this, the ACDC distributes the fragments created in each event in the different size-bins, and removes the bodies that are catastrophically disrupted. The dynamical component is given by the depletion of bodies from the different regions of the MB via the Yarkovsky effect. To simulate big impact events in a realistic manner, our algorithm works stochastically by treating the breakups as Poisson random events. So, runs using different seeds for the random number generator produce different results. Thus, we develop a set of runs using different random seeds and then interpret the results statistically. To do so, we performed 1600 runs with ACDC and selected 26 runs that provide a better fit with the 6 regions of the MB, according to the criterion outlined in [1].