Fig. 7

image

Critical specific impact energies Qcrit. The energy thresholds for shape-changing impacts on a 67P-like shape (Qreshape) for different material strength are shown, as well as the catastrophic disruption energies for various impact velocities. We note that the Qbil values found for shape-changing collisions on generic bi-lobe shapes overlap the results for Qreshape with YT = 1000 Pa; they are not shown seperately. The solid lines show the scaling law (Eq. (2)) with parameters given in Table 2. The maximal global temperature increase dT shown on the right y axis is estimated by assuming that all kinetic impact energy is converted into internal energy: dT = Qcrit/cp where a constant heat capacity cp = 100 J/kg/K is used.

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