Physics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.0505l&link_type=abstract
American Astronomical Society, ESS meeting #2, #5.05
Physics
Scientific paper
Collisions are a core component of planet formation. Using new high-resolution simulations of collisions between planetesimals for a wide range of projectile-to-target mass ratios, impact angles, and impact velocities, we derive a complete analytic description of the dynamical outcome for any collision between gravity-dominated bodies (from 100 m planetesimals to planets). The range of impact parameters encountered during growth from planetesimals to planets span multiple collision outcome regimes: cratering, merging, disruption, hit-and-run, and erosive hit-and-run events. We derive equations to demarcate the transition between collision regimes and to describe the size and velocity distributions of the post-collision bodies. The scaling laws include only four material parameters, which are tightly constrained by the available data. All collision outcomes are described in terms of the impact conditions and the catastrophic disruption criteria, the specific energy required to disperse half the total colliding mass. The collisional model presented here will significantly improve the physics of collisions between gravity-dominated bodies in numerical simulations of planet formation and collisional evolution.
This work is made possible by STFC and NASA.
Leinhardt Zoe
Paardekooper S.
Stewart Sarah T.
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