ИСТИНА

We simulated passing planetesimals through the circumplanetary disks of Jupiter and Saturn and capture of their material into the disks with consideration of combined processes of aerodynamic braking, fragmentation, and ablation of planetesimals in the disk’s gas medium. Below are the results of simulation for the comet material of the planetesimals. We estimated maximum planetesimal size which the body should have at the entrance to the disk in order to stay in the disk after loosing mass and velocity due to gas drag and ablation. We have obtained limitations on planetesimal at which the body is fragmented and its mass remains in the protosatellite disk. The conditions for disk capture of the entire mass of planetesimals are different for satellites. For material strength > 3*104 Pa a significant difference in the total masses of planetesimals with radii from 0 to 10 km capturing by the circumplanetary disks in the feeding area of Ganymede, Callisto and Titan is possible and could lead to a low differentiation of Callisto and Titan compared to Ganymede.