Variable Catastrophic Disruption Criteria during Planet Formation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Numerical and analytical models for planetesimal evolution focus on the criteria for accretion and erosion. Studies of the catastrophic disruption criteria have, in general, used homogeneous, non-porous materials. The results from the impact experiments are used to construct simple rules to determine the collision outcome in numerical simulations of planet formation. However, the catastrophic disruption threshold should change as the protoplanetary nebula evolves and the collision velocities increase from subsonic to supersonic, initially porous planetesimals are compacted into objects with little void space, and solid, monolithic, non-porous bodies are disrupted into rubble piles. We have explored the possible range of variability in disruption criteria under conditions expected during planet formation and find that the catastrophic disruption criteria for bodies smaller than 100 km changes dramatically during the formation and evolution of the solar system. Initially, planetesimals are much weaker than previously assumed. As a result, we suggest that planetesimal growth requires more than collisions alone.

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