1:45 PM - 2:00 PM
[PPS11-01] Satellitesimal formation in a circumplanetary disk and pebble accretion
Keywords:Satellite, Satellite formation, Pebble accretion , Circumplanetary disk, Satellitesimal, Gas planet
We found that most of pebbles flow into a circumplanetary disk not from the high-altitude of the disk but from the mid-plane against gas outflows. We also found that the growth processes of pebbles in a circumplanetary disk are divided into two much different ways; 1) satellitesimal formation by direct collisional growth of pebbles and subsequent satellite formation by direct collisional growth of the satellitesimals in a critical orbit, and 2) pebble accretion by large satellitesimals outside of the critical orbit. The critical orbit is moved by the conditions of the disk and pebbles. We introduce a parameter x, the ratio of the two mass fluxes of pebbles; flowing into the circumplanetary disk and drifted from the outer region of the protoplanetary disk. When x = 1, the critical orbit is in r ~ 20 RJ in the circumplanetary disk around a Jupiter-like planet with the mass of 0.4 MJ. However, when x = 0.1, the critical orbit is in r ~ 3 RJ. Outside of the critical orbit, large satellitesimals accrete pebbles within their accretion radiuses. The radius expands dramatically when the mass of the satellitesimal reaches 1023-1024 g, and the satellitesimal grows rapidly after that.
In conclusion, we paved the way for the formation of satellitesimals in a circumplanetary disk and reveal a rough picture of the pebble accretion by the satellitesimals.