Accretion efficiency during planetary collisions

Craig Agnor, Erik Asphaug

Research output: Contribution to journalArticlepeer-review

138 Scopus citations


We present the results of smoothed particle hydrodynamic simulations of collisions between two 0.10 M differentiated planetary embryos with impact dynamics that are thought to be common to the late stage of terrestrial planet formation. At low impact velocities (υimp/ υesc < 1.5) and for direct collisions, the impacts are largely accretionary. Inelastic bouncing between embryos with varying degrees of erosion, followed by escape to infinity, is also a common outcome. For dynamical environments typical of most late-stage accretion models, we estimate that more than half of all collisions between like-sized planetary embryos do not result in accumulation into a larger embryo.

Original languageEnglish (US)
Pages (from-to)L157-L160
JournalAstrophysical Journal
Issue number2 II
StatePublished - Oct 1 2004
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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