Fig. 1

The outcome of our simulations of pre-planetesimal collisions encompasses all sticking (S), bouncing (B), and fragmentation (F) types proposed by Güttler et al. (2010). The initial configuration for each simulation is a sphere with radius rt = 10 cm as resting target and a sphere with rp = 6 cm as projectile except for S3 and F2, where rp = 2 cm. The colour code indicates the filling factor φ. Both objects are initially set up with φ = 0.35 except for the F2 case, where φ = 0.55. The simulations are carried out with different impact velocities and the snap shots are taken at different times. The details are given in the text.
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