The dissipation of the solar nebula constrained by impacts and core cooling in planetesimals
| Autor: | Alison C. Hunt, Karen J. Theis, Mark Rehkämper, Gretchen K. Benedix, Rasmus Andreasen, Maria Schönbächler |
|---|---|
| Přispěvatelé: | Science and Technology Facilities Council (STFC) |
| Rok vydání: | 2022 |
| Předmět: |
Asteroids
comets and Kuiper belt Core processes Early solar system Geochemistry Meteoritics CLOSURE TEMPERATURE FOS: Physical sciences Astronomy & Astrophysics Physics - Geophysics HISTORY ACCRETION Earth and Planetary Astrophysics (astro-ph.EP) Science & Technology ORIGIN PLATINUM ISOTOPES Astronomy and Astrophysics FOS: Earth and related environmental sciences Geophysics (physics.geo-ph) GIANT PLANETS Physical Sciences PD-AG CHRONOMETRY CRYSTALLIZATION IRON-METEORITES SYSTEM Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Nature Astronomy, 6 (7) Hunt, A C, Theis, K J, Rehkämper, M, Benedix, G K, Andreasen, R & Schönbächler, M 2022, ' The dissipation of the solar nebula constrained by impacts and core cooling in planetesimals ', Nature Astronomy, vol. 6, no. 7, pp. 812-818 . https://doi.org/10.1038/s41550-022-01675-2 85th Annual Meeting of the Meteoritical-Society |
| ISSN: | 2397-3366 |
| Popis: | Rapid cooling of planetesimal cores has been inferred for several iron meteorite parent bodies on the basis of 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 that closure times for the iron meteorites equate to cooling in the time frame ~7.8–11.7 Myr after calcium–aluminium-rich inclusion formation, and that they indicate that an energetic inner Solar System persisted at this time. This probably 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 calcium–aluminium-rich inclusion formation could have reinforced this effect. This correlates well with the timing of impacts recorded by the Pd–Ag system for iron meteorites. Nature Astronomy, 6 (7) ISSN:2397-3366 |
| Databáze: | OpenAIRE |
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