Fate of the runner in hit-and-run collisions

Abstract

In similar-sized planetary collisions, a significant part of the impactor often misses the target and continues downrange. We follow the dynamical evolution of "runners" from giant impacts to determine their ultimate fate. Surprisingly, runners re-impact their target planets only about half of the time, for realistic collisional and dynamical scenarios. Otherwise they remain in orbit for tens of millions of years (the limit of our N-body calculations) and longer, or sometimes collide with a different planet than the first one. When the runner does return to collide again with the same arget planet, its impact velocity is mainly constrained by the outcome of the prior collision. Impact angle and orientation, however, are unconstrained by the prior collision.

24 pages, 14 figures, 4 tables, accepted for publication in ApJ

References in corpus (10)

• Atmospheric Mass Loss During Planet Formation: The Importance of Planetesimal Impacts
• Astrophysical Smooth Particle Hydrodynamics
• Formation of Phobos and Deimos via a Giant Impact
• Multiple Impact Origin for the Moon
• Collisional Stripping and Disruption of Super-Earths
• A Collisional Origin to Earth's Non-chondritic Composition?
• On the Impact Origin of Phobos and Deimos I: Thermodynamic and Physical Aspects
• Numerically Predicted Indirect Signatures of Terrestrial Planet Formation
• Transfer, loss and physical processing of water in hit-and-run collisions of planetary embryos
• Constraints on the pre-impact orbits of Solar System giant impactors

Cited by in corpus (11)

• Realistic On-the-fly Outcomes of Planetary Collisions II: Bringing Machine Learning to N-body Simulations
• Realistic collisional water transport during terrestrial planet formation: Self-consistent modeling by an N-body--SPH hybrid code
• Collision Chains among the Terrestrial Planets. III. Formation of the Moon
• The Effect of Inefficient Accretion on Planetary Differentiation
• Investigating the Feasibility of an Impact-Induced Martian Dichotomy
• The Role of Giant Impacts in Planet Formation
• A race against the clock: Constraining the timing of cometary bombardment relative to Earth's growth
• Collision Chains among the Terrestrial Planets. II. An Asymmetry between Earth and Venus
• Ejection of close-in super-Earths around low-mass stars in the giant impact stage
• Hypothetical hyperbolic encounters between Venus and proto-Mercury that partially \ stripped away proto-Mercury's mantle
• The energy budgets of giant impacts