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Giant planet orbital instability occurred 60-100 million years after Solar System formation, implanting early planetary material into the asteroid belt. This timing may link to the Moon-forming giant impact.

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Area of Science:

  • Planetary Science
  • Solar System Dynamics
  • Astrogeology

Background:

  • The Solar System's giant planets formed on compact orbits, later migrating to their current wider configuration due to an orbital instability.
  • The precise timing of this giant planet orbital instability remains poorly constrained, impacting our understanding of early Solar System evolution.

Purpose of the Study:

  • To determine the timing of the giant planet orbital instability.
  • To investigate the link between this instability and the implantation of terrestrial planet materials into the asteroid belt.
  • To explore potential connections between the instability and the Moon-forming giant impact.

Main Methods:

  • Utilizing dynamical simulations to model the orbital instability and subsequent implantation of planetesimal fragments.
  • Analyzing meteorite data to establish a temporal constraint for the implantation event.
  • Integrating simulation results with existing data from Jupiter's Trojan asteroids.

Main Results:

  • Dynamical simulations confirmed that the giant planet orbital instability implanted planetesimal fragments from the terrestrial region into the asteroid main belt.
  • Meteorite data indicate that this implantation event occurred more than 60 million years after the Solar System's formation.
  • Combined constraints suggest the orbital instability occurred between 60 and 100 million years post-formation.

Conclusions:

  • The giant planet orbital instability occurred 60 to 100 million years after Solar System formation.
  • The timing of the instability coincides with the period of the Moon-forming giant impact, suggesting a potential causal relationship.
  • This research refines the timeline of early Solar System events and their interconnections.