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SPH simulations of high-speed collisions between asteroids and comets

2022; Elsevier BV; Volume: 383; Linguagem: Inglês

10.1016/j.icarus.2022.115064

1090-2643

J. Rozehnal, M. Brož, David Nesvorný, K. J. Walsh, D. D. Durda, D. C. Richardson, Erik Asphaug,

Astrophysics and Star Formation Studies

We studied impact processes by means of smoothed-particle hydrodynamics (SPH) simulations. The method was applied to modelling formation of main-belt families during the cometary bombardment (either early or late, ∼3.85Gy ago). If asteroids were bombarded by comets, as predicted by the Nice model, hundreds of asteroid families (catastrophic disruptions of diameter D≥100km bodies) should have been created, but the observed number is only 20. Therefore we computed a standard set of 125 simulations of collisions between representative D=100km asteroids and high-speed icy projectiles (comets), in the range 8 to 15 km/s. According to our results, the largest remnant mass Mlr is similar as in low-speed collisions, due to appropriate scaling with the effective strength Qeff, but the largest fragment mass Mlf exhibits systematic differences — it is typically smaller for craterings and bigger for super-catastrophic events. This trend does not, however, explain the non-existence of old families. The respective parametric relations can be used in other statistical (Monte-Carlo) models to better understand collisions between asteroidal and cometary populations.