Hit-and-run planetary collisions

Erik Asphaug, Craig B. Agnor, Quentin Williams

Research output: Contribution to journalReview article

182 Scopus citations

Abstract

Terrestrial planet formation is believed to have concluded in our Solar System with about 10 million to 100 million years of giant impacts, where hundreds of Moon- to Mars-sized planetary embryos acquired random velocities through gravitational encounters and resonances with one another and with Jupiter. This led to planet-crossing orbits and collisions that produced the four terrestrial planets, the Moon and asteroids. But here we show that colliding planets do not simply merge, as is commonly assumed. In many cases, the smaller planet escapes from the collision highly deformed, spun up, depressurized from equilibrium, stripped of its outer layers, and sometimes pulled apart into a chain of diverse objects. Remnants of these 'hit-and-run' collisions are predicted to be common among remnant planet-forming populations, and thus to be relevant to asteroid formation and meteorite petrogenesis.

Original languageEnglish (US)
Pages (from-to)155-160
Number of pages6
JournalNature
Volume439
Issue number7073
DOIs
StatePublished - Jan 12 2006

ASJC Scopus subject areas

  • General

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    Asphaug, E., Agnor, C. B., & Williams, Q. (2006). Hit-and-run planetary collisions. Nature, 439(7073), 155-160. https://doi.org/10.1038/nature04311