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Dating the giant planet orbital instability in our solar system with enstatite meteorites.

Presentation #321.02 in the session Asteroids: Origins (Oral Presentation)

Published onOct 23, 2023
Dating the giant planet orbital instability in our solar system with enstatite meteorites.

The giant planets of our solar system transitioned from their compact, proto-planetary disk orbits to the current orbital configuration via a phase of dynamical instability. The epoch of this instability is strongly debated. Combining isotopic constraints, meteorite thermochronometers, thermal modeling and dynamical simulations, we show that planetesimal fragments from the terrestrial zone must have been implaneted into the main asteroid belt at least 60 Myr after the beginning of the solar system. The giant planet instability is the only dynamical process that can enable such implantation so late in the solar system timeline. In combination with an upper limit, deduced from the existence of Jupiter Trojan binaries, our work tightly constraints the giant planet instability to have occurred 60-100 Myr after the beginning of the solar system. Most estimates of the timing of the Moon-forming event match this time interval, suggesting a causal relationship between giant planet instability and Moon formation.

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