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

Abstract

Rapid cooling of planetesimal cores has been inferred for several iron meteorite 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 used the short-lived 107Pd / 107Ag decay system to date rapid core cooling by determining Pd-Ag 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 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 damping effect of gas drag ceases. An early giant planet instability between 5 and 14 Myr after CAI could have reinforced this effect. This correlates well with the timing of impacts recorded by the Pd Ag system for iron meteorites.

arXiv comment3 tables, 2 figures, 3 extended data figures, 1 supplementary table

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Cited by in corpus (5)

• Spectral analysis of basaltic asteroids observed by the Gaia space mission
• An early giant planet instability recorded in asteroidal meteorites
• Metal-silicate mixing in planetesimal collisions
• Episodic planetesimal disruptions triggered by dissipation of gas disk
• Asteroids fail to retain cometary impact signatures