Capture of planetesimals by waning circumplanetary gas disks

Abstract

When gas giant protoplanets grow sufficiently massive, circumplanetary disks would form. While solid bodies captured by the circumplanetary disks likely contribute to the growth of the planets and regular satellites around them, some of captured bodies would remain in planet-centered orbits after the dispersal of the disk. We examine capture and subsequent orbital evolution of planetesimals in waning circumplanetary gas disks using three-body orbital integration. We find that some of captured planetesimals can survive in the circumplanetary disk for a long period of time under such weak gas drag. Captured planetesimals have semi-major axes smaller than about one third of the planet's Hill radius. Distributions of their eccentricities and inclinations after disk dispersal depend on the strength of gas drag and the timescale of disk dispersal, and initially strong gas drag and quick disk dispersal facilitates capture and survival of planetesimals. However, in such a case, final orbital eccentricities and inclinations of captured bodies remain rather large. Although our results suggest that some of the present irregular satellites of gas giant planets with small semi-major axes would have been captured by gas drag, other mechanisms are required to fully explain their current orbital characteristics.

arXiv comment46 pages, 18 figures, accepted for publication in ApJ

References in corpus (11)

• Distribution of Accreting Gas and Angular Momentum onto Circumplanetary Disks
• Origin of the Different Architectures of the Jovian and Saturnian Satellite Systems
• Irregular Satellites of the Planets: Products of Capture in the Early Solar System
• N-body Simulations of Satellite Formation around Giant Planets: Origin of Orbital Configuration of the Galilean Moons
• Capture of Irregular Satellites at Jupiter
• Angular Momentum Accretion onto a Gas Giant Planet
• Collisional Evolution of Irregular Satellite Swarms: Detectable Dust around Solar System and Extrasolar Planets
• Capture and Evolution of Planetesimals in Circumjovian Disks
• Three-Body Capture of Irregular Satellites: Application to Jupiter
• Accretion of Solid Materials onto Circumplanetary Disks from Protoplanetary Disks
• Irregular satellites of Jupiter: Capture configurations of binary-asteroids

Cited by in corpus (3)

• Meridional Circulation of Dust and Gas in the Circumstellar Disk: Delivery of Solids onto the Circumplanetary Region
• Dust evolution and satellitesimal formation in circumplanetary disks
• Distribution of captured planetesimals in circumplanetary gas disks and implications for accretion of regular satellites