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Understanding the collisional behavior of dust aggregates consisting ofsubmicron-sized grains is essential to unveiling how planetesimals formed inprotoplanetary disks. It is known that the collisional behavior of individualdust particles strongly depends on the strength of viscous dissipation force;however, impacts of viscous dissipation on the collisional behavior of dustaggregates have not been studied in detail, especially for the cases of obliquecollisions. Here we investigated the impacts of viscous dissipation on thecollisional behavior of dust aggregates. We performed numerical simulations ofcollisions between two equal-mass dust aggregates with various collisionvelocities and impact parameters. We also changed the strength of viscousdissipation force systematically. We found that the threshold collisionvelocity for the fragmentation of dust aggregates barely depends on thestrength of viscous dissipation force when we consider oblique collisions. Incontrast, the size distribution of fragments changes significantly when theviscous dissipation force is considered. We obtained the empirical fittingformulae for the size distribution of fragments for the case of strongdissipation, which would be useful to study the evolution of size and spatialdistributions of dust aggregates in protoplanetary disks.

Impacts of viscous dissipation on collisional growth and fragmentation of dust aggregates