Numerical Simulation of Dust Aggregate Collisions: Growth and Disruption of Dust Aggregates

Details Numerical Simulation of Dust Aggregate Collisions: Growth and Disruption of Dust Aggregates Numerical Simulation of Dust Aggregate Collisions: Growth and Disruption of Dust Aggregates

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1158..103w&link_type=abstract

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP Conference Proceedings, V

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Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Aggregation, Accretion And Accretion Disks, General, Solar Nebula, Cosmogony

Scientific paper

Growth and disruption processes of dust aggregates by their mutual collisions play an important role in our understanding of planetesimal formation in protoplanetary disks. To examine the critical collision velocity of aggregate disruption, we performed numerical simulations of relatively high-velocity collisions of aggregates that consist of submicrometer-sized ice spheres. As an initial condition of aggregate structure in collision simulations, we used two kinds of aggregates. One is a relatively compact aggregate formed through ballistic particle-cluster aggregation (BPCA) and the other is a fluffy aggregate formed through ballistic cluster-cluster aggregation (BCCA). Our results show that icy aggregates are able to grow through collisions with velocities up to ~50 m s-1, in spite of their initial structures and impact parameters. This supports a scenario of planetesimal formation through collisions of dust aggregates in protoplanetary disks.

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