N-Body simulations of small ( D = 10 km ) asteroidal breakups and improved parametric relations for Monte–Carlo collisional models]]>

摘要

Highlights ? 125 SPH/N-body simulations of impacts into 10 km bodies have been carried out ? Resulting distributions of fragments differ from simulations of 100 km bodies ? New parametric relations for largest remnants and fragments were derived Abstract We report on our study of asteroidal breakups, i.e.?fragmentations of targets, subsequent gravitational reaccumulation and formation of small asteroid families. We focused on parent bodies with diameters D pb = 10 km . Simulations were performed with a smoothed-particle hydrodynamics (SPH) code combined with an efficient N-body integrator. We assumed various projectile sizes, impact velocities and impact angles (125 runs in total). Resulting size-frequency distributions are significantly different from scaled-down simulations with D pb = 100 km targets (Durda et?al., 2007). We derive new parametric relations describing fragment distributions, suitable for Monte-Carlo collisional models. We also characterize velocity fields and angular distributions of fragments, which can be used as initial conditions for N-body simulations of small asteroid families. Finally, we discuss a number of uncertainties related to SPH simulations. ]]>