Stars & Planets Group Modelling Dusty Debris Disks Infrared and sub-millimetre observations of dusty debris disks around young Main Sequence stars often show asymmetries which could be due to the perturbing force of an unseen planet. We are using a modified version of the SWIFT integration package with includes Poynting-Robertson and solar wind drag to model debris disks. This enables us to follow the evolution of a swarm of dust particles in the presence of an unseen extrasolar planet. References: Deller & Maddison (2005), Numerical Modelling of Dusty Debris Disks, ApJ, 625, p398 Fomalhaut simualtions HST press release by Paul Kalas Swinburne team traces an invisible planet, Swinburne press release