Solar System instability and rapid core cooling in iron meteorites

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Earth and Planetary Astrophysics

Geophysics

Solar System instability and rapid core cooling in iron meteorites

The Dissipation of the Solar Nebula Constrained by Impacts and Core Cooling in Planetesimals

Rapid cooling of planetesimal cores has been inferred for several ironmeteorite parent bodies based on metallographic cooling rates, and linked to the loss of their insulating mantles during impacts.

However, the timing of these disruptive events is poorly constrained.

Here, we use the short-lived 107pd / 107ag decay system to date rapid core cooling by determining ages for iron meteorites.

We show closure times for the iron meteorites equate to cooling in the timeframe ~7.8 to 11.7 myr after the cataclysmic event (cai), and indicate that an energetic inner solar system persisted at this time.

This likely results from the dissipation of gas in the protoplanetary disk, after which the dampingeffect of gas drag ceases.

An early giant planet instability between 5 and 14 myr after the cai could have reinforced this effect.

Authors

Alison C. Hunt, Karen J. Theis, Mark Rehkämper, Gretchen K. Benedix, Rasmus Andreasen, Maria Schönbächler

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