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ABSTRACT 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. Access through your institution Buy or subscribe This is a preview of subscription content, access via your

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institutional subscriptions * Read our FAQs * Contact customer support SIMILAR CONTENT BEING VIEWED BY OTHERS RECURRENT PLANETESIMAL FORMATION IN AN OUTER PART OF THE EARLY SOLAR SYSTEM

Article Open access 01 July 2024 COMMON FEEDSTOCKS OF LATE ACCRETION FOR THE TERRESTRIAL PLANETS Article 30 September 2021 RAPID FORMATION OF EXOPLANETESIMALS REVEALED BY WHITE DWARFS

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Geochronological Center, 2003). Download references ACKNOWLEDGEMENTS This work was supported by the European Research Council under the European Union’s Seventh Framework Programme

(FP7/2007–2013/ERC grant agreement 279779, M.S.). We gratefully acknowledge funding from STFC (ST/F002157/1 and ST/J001260/1, M.R.; ST/J001643/1, M.S.) and funding from the Swiss National

Science Foundation (project 200020_179129, M.S.). A.C.H. wishes to thank M. Ek and M. Fehr for laboratory assistance at ETH Zürich during this study. M.S. would like to thank R. Carlson and

M. Horan (DTM, Carnegie Institution) for their support and the opportunity to analyse Ag isotopes in May 2006. We also thank C. Smith and D. Cassey (Natural History Museum, London) and J.

Hoskin (Smithsonian Institution National Museum of Natural History) for the loan of samples used in this work. AUTHOR INFORMATION Author notes * Karen J. Theis Present address: The Photon

Science Institute, The University of Manchester, Manchester, UK AUTHORS AND AFFILIATIONS * Institute of Geochemistry and Petrology, ETH Zürich, Zürich, Switzerland Alison C. Hunt & Maria

Schönbächler * School of Earth and Environmental Sciences, The University of Manchester, Manchester, UK Karen J. Theis * Department of Earth Science & Engineering, Imperial College

London, London, UK Mark Rehkämper * Space Science and Technology Centre, School of Earth and Planetary Sciences, Curtin University, Perth, Western Australia, Australia Gretchen K. Benedix *

Department of Earth and Planetary Sciences, Western Australian Museum, Perth, Western Australia, Australia Gretchen K. Benedix * Department of Geoscience, Aarhus University, Aarhus, Denmark

Rasmus Andreasen Authors * Alison C. Hunt View author publications You can also search for this author inPubMed Google Scholar * Karen J. Theis View author publications You can also search

for this author inPubMed Google Scholar * Mark Rehkämper View author publications You can also search for this author inPubMed Google Scholar * Gretchen K. Benedix View author publications

You can also search for this author inPubMed Google Scholar * Rasmus Andreasen View author publications You can also search for this author inPubMed Google Scholar * Maria Schönbächler View

author publications You can also search for this author inPubMed Google Scholar CONTRIBUTIONS M.S. designed the study. A.C.H., K.J.T. and M.S. prepared samples for isotope analyses and

conducted the isotopic measurements. All authors were involved in the data interpretation and writing of the manuscript. CORRESPONDING AUTHOR Correspondence to Alison C. Hunt. ETHICS

DECLARATIONS COMPETING INTERESTS The authors declare no competing interests. PEER REVIEW PEER REVIEW INFORMATION _Nature Astronomy_ thanks James Van Orman and the other, anonymous,

reviewer(s) for their contribution to the peer review of this work. ADDITIONAL INFORMATION PUBLISHER’S NOTE Springer Nature remains neutral with regard to jurisdictional claims in published

maps and institutional affiliations. EXTENDED DATA EXTENDED DATA FIG. 1 COVARIATION OF Ε192PT AND Ε196PT FOR THE IAB, IIAB AND IIIAB IRON METEORITES. The GCR model calculations10 are shown

for Ir/Pt ratios measured for these groups (dashed lines; Ir/Pt ratios for individual samples are given in Supplementary Materials Table 1). Uncertainties are 2 S.D. EXTENDED DATA FIG. 2

ISOCHRON DIAGRAMS FOR A) IAB, B) IIAB, AND C) IIIAB IRON METEORITES FOR THE PD–AG SYSTEM. In each case, ε107Ag is plotted against 108Pd/109Ag for both GCR-corrected (filled symbols) and

GCR-uncorrected data (unfilled symbols). Uncertainties on GCR-uncorrected data are 2 S.D. and within the size of the symbol (Table 1), while uncertainties for ε107Ag for GCR-corrected data

represent the propagated 2 S.D. uncertainties of the GCR correction (Table 2). Isochrons are determined using GCR-corrected data and ISOPLOT55. *denotes GCR-corrected data from source11,

shown for comparison but not included in the regressions. EXTENDED DATA FIG. 3 IAB PARENT BODY EVOLUTION FOR BOTH METAL COOLING TIMES. In both scenarios the parent body accreted relatively

late at ~1.4 Myr and then underwent limited metal-silicate differentiation at ~6.0 Myr after CAI14. For metal cooling at ~12.8 Myr, the catastrophic impact event occurred in the timeframe

~11–13.6 Myr. This was followed by fast cooling and closure of the Pd–Ag system at ~12.8 +3.1/-4.6 Myr. For metal cooling at ~7.9 Myr after CAI the body was disrupted at about 6 Myr, while

at or near its peak temperature. It then cooled quickly, leading to closure of the Pd–Ag system at 7.9 +1.0/-1.1 Myr. SUPPLEMENTARY INFORMATION SUPPLEMENTARY TABLE 1 Summary of concentration

and isotope data for Pd–Ag and Pt for IAB, IIAB and IIIAB iron meteorites. RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Hunt, A.C., Theis, K.J.,

Rehkämper, M. _et al._ The dissipation of the solar nebula constrained by impacts and core cooling in planetesimals. _Nat Astron_ 6, 812–818 (2022).

https://doi.org/10.1038/s41550-022-01675-2 Download citation * Received: 22 November 2021 * Accepted: 01 April 2022 * Published: 23 May 2022 * Issue Date: July 2022 * DOI:

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