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Transporting solids of different sizes is an essential process in theevolution of protoplanetary disks and planet formation. Large solids aresupposed to drift inward; high-temperature minerals found in comets are assumedto have been transported outward. From low-gravity experiments on parabolicflights we studied the light-induced erosion of dusty bodies caused by asolid-state greenhouse effect and photophoresis within a dust bed's upperlayers. The gravity levels studied were 0.16g, 0.38g, 1g, and 1.7g. The lightflux during the experiments was 12 +/- 2 kW/m^2 and the ambient pressure was 6+/- 0.9 mbar. Light-induced erosion is strongly gravity dependent, which is inagreement with a developed model. In particular for small dusty bodies((sub)-planetesimals), efficient erosion is possible at the optically thininner edges of protoplanetary disks. Light-induced erosion prevents significantparts of a larger body from moving too close to the host star and be beingsubsequently accreted. The small dust produced continues to be subject tophotophoresis and is partially transported upward and outward over the surfaceof the disk; the resulting small dust particles observed over the disk'slifetime. The fraction of eroded dust participates in subsequent cycles ofgrowth during planetesimal formation. Another fraction of dust might becollected by a body of planetary size if this body is already present close tothe disk edge. Either way, light induced erosion is an efficient recyclingprocess in protoplanetary disks.

From Planetesimals to Dust: Low Gravity Experiments on Recycling Solids at the Inner Edge of Protoplanetary Disks