2015ApJ...811...60K

We describe an extensive suite of numerical calculations for the collisional evolution of irregular satellite swarms around 1-300 planets orbiting at 120 AU in the Fomalhaut system. For 10-100 planets, swarms with initial masses of roughly 1% of the planet mass have cross-sectional areas comparable to the observed cross-sectional area of Fomalhaut b. Among 30-300 planets, our calculations yield optically thick swarms of satellites for ages of 1-10 Myr. Observations with the Hubble Space Telescope and ground-based AO instruments can constrain the frequency of these systems around stars in the β Pic moving group and possibly other nearby associations of young stars.