Overstability in fully self-gravitating system

A. MONDINO-LLERMANOS; C. A. GIUPPONE; HEIKKI SALO; JURGUEN SCHMIDT

Geneve

Congreso; EPSC-DPS Joint Meeting; 2019

Saturn?s rings exhibit a wealth of radial structure covering a vast range of lengthscales. On the shortest scales, quasi-periodic density variations of wavelengths ranging from one to a few hundred meters are observed intermittently populating several locations of the inner A-ring as well as the less opaque areas of the B-ring.We present a systematic study of fully selfgravitational large scale N-body simulations, expanding upon the study of [6]. For this purpose a newmethod is used, combining the tree-based routines of the open source REBOUND with soft-particle impacts. We examine the factors which determinate the threshold density required for the triggering of overstability, both in non-gravitational and selfgravitational cases, and compare the saturation wavelengths