Experimental Studies of Low Velocity Impacts into Dust

Details Experimental Studies of Low Velocity Impacts into Dust Experimental Studies of Low Velocity Impacts into Dust

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.6522c&link_type=abstract

American Astronomical Society, DPS Meeting #32, #65.22; Bulletin of the American Astronomical Society, Vol. 32, p.1643

Astronomy and Astrophysics

Astronomy

Scientific paper

Collisions in planetary ring systems occur at speeds ranging from a fraction of a cm/s to many m/s, depending on the particular ring environment. Low collision velocities were also prevalent in the early protoplanetary disk. In both systems impacts involve aggregates of dust particles or macroscopic particles coated with a layer of dust. We are studying the dissipation of energy and production of dust ejecta in low velocity collisions with new laboratory and microgravity impact experiments. We describe our experimental approach and preliminary results. We have performed impact experiments into JSC-1 basalt powder at impact speeds between 1.1 and 2.4 m/s in a new laboratory experiment. Ejecta throw distances are related to velocity and indicate a much steeper ejecta velocity distribution than is seen in hypervelocity impacts. We present our initial findings on the dependence of ejecta mass and velocity distributions on impact velocity in this low velocity regime. In collisions between ring particles and planetesimals gravity plays a negligible role. We also describe a new experimental apparatus to study collisions into dust at impact speeds below 1 m/s in a microgravity environment. These results will extend and compliment our ground-based program data set.

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