Asteroidal catastrophic collisions simulated by hypervelocity impact experiments

Computer Science – Sound

Scientific paper

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Asteroids, Collisions, Hypervelocity Impact, Planetary Evolution, Fragments, Histograms, Mass Distribution, Shock Waves

Scientific paper

The authors report the results of six impact fragmentation experiments carried out with free-falling macroscopic targets of different compositions and shapes, and with projectile velocities close to 9 km/sec., i.e., significantly higher than the sound velocity in the target materials. The data have been examined by deriving the mass and shape distributions of the fragments, by reconstructing two of the shattered targets in order to study the geometry of the fracture surfaces, and by analyzing the properties of the fine-grained high-velocity ejecta. The fragment mass distributions show clearly that the degree of target fragmentation depends strongly on the impact parameter. While the collisional theory for the origin of families is fully consistent with the experimental results, the elongated shapes of several Apollo-Amor objects are much rarer among the laboratory fragments, and thus appear to require a different explanation.

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