Evolution of gas and dust in an evolving supernova remnant.

Simulation of the evolution of gas density and dust grains in a supernova remnant. The dust grains start embedded in dense clumps within the expanding supernova ejecta. The ejecta are rapidly expanding and create a fast outwardly moving shock wave. The pressure behind that shock creates a reverse shock that propagates back toward the center of the explosion. When the reverse shock hits the clumpy ejecta it heats and disrupts them and the dust decouples from the gas. The grains are slowed by gas drag and are eroded by sputtering. Toward the end of the simulation a substantial fraction of the grains have escaped ahead of the forward shock, illustrating that at least a significant fraction of supernova created dust can escape into the interstellar medium.