Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1525l&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1525
Physics
Scientific paper
Collisions are the core component of planet formation. Using new high-resolution simulations of collisions between planetesimals for a wide range of projectileto- target mass ratios, impact angles, and impact velocities, we have derived a complete analytic description of the dynamical outcome for any collision between gravity-dominated bodies (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 have derived 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, Q RD, the specific energy required to disperse half the total colliding mass. The selfconsistent scaling laws will significantly improve the physics of collisions between gravity-dominated bodies in numerical simulations of planet formation and collisional evolution. This corpus of work, [1], has been split into two abstracts. In this abstract, we focus on the transitions between collisional regimes. In our companion abstract [2], we focus on describing a general catastrophic disruption law for planet formation.
Leinhardt Zoë M.
Stewart Sarah T.
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