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Isotopic Evolution of the Inner Solar System Inferred from Molybdenum Isotopes in Meteorites

Spitzer, Fridolin and Burkhardt, Christoph and Budde, Gerrit and Kruijer, Thomas S. and Morbidelli, Alessandro and Kleine, Thorsten (2020) Isotopic Evolution of the Inner Solar System Inferred from Molybdenum Isotopes in Meteorites. Astrophysical Journal Letters, 898 (1). Art. No. L2. ISSN 2041-8213. https://resolver.caltech.edu/CaltechAUTHORS:20200716-124002307

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Abstract

The fundamentally different isotopic compositions of non-carbonaceous (NC) and carbonaceous (CC) meteorites reveal the presence of two distinct reservoirs in the solar protoplanetary disk that were likely separated by Jupiter. However, the extent of material exchange between these reservoirs, and how this affected the composition of the inner disk, are not known. Here we show that NC meteorites display broadly correlated isotopic variations for Mo, Ti, Cr, and Ni, indicating the addition of isotopically distinct material to the inner disk. The added material resembles bulk CC meteorites and Ca–Al-rich inclusions in terms of its enrichment in neutron-rich isotopes, but unlike the latter materials is also enriched in s-process nuclides. The comparison of the isotopic composition of NC meteorites with the accretion ages of their parent bodies reveals that the isotopic variations within the inner disk do not reflect a continuous compositional change through the addition of CC dust, indicating an efficient separation of the NC and CC reservoirs and limited exchange of material between the inner and outer disk. Instead, the isotopic variations among NC meteorites more likely record a rapidly changing composition of the disk during infall from the Sun's parental molecular cloud, where each planetesimal locks the instant composition of the disk when it forms. A corollary of this model is that late-formed planetesimals in the inner disk predominantly accreted from secondary dust that was produced by collisions among pre-existing NC planetesimals.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/2041-8213/ab9e6aDOIArticle
https://arxiv.org/abs/2006.13528arXivDiscussion Paper
ORCID:
AuthorORCID
Spitzer, Fridolin0000-0002-6114-0854
Burkhardt, Christoph0000-0002-6952-5783
Budde, Gerrit0000-0003-0762-779X
Kruijer, Thomas S.0000-0003-0974-4324
Morbidelli, Alessandro0000-0001-8476-7687
Kleine, Thorsten0000-0003-4657-5961
Additional Information:© 2020 The American Astronomical Society. Received 2020 March 27; revised 2020 June 17; accepted 2020 June 17; published 2020 July 16. Constructive reviews by A. Treiman and an anonymous reviewer greatly improved this Letter and are gratefully acknowledged. We also thank E.G. Rivera-Valentín for efficient editorial handling, and the American Museum of Natural History (New York City), the Field Museum of Natural History (Chicago), the National History Museum (London), and the Smithsonian Institution (Washington, DC) for generously providing meteorite samples for this study. This project was funded by the Deutsche Forschungsgemeinschaft (DFG; German Research Foundation)—Project-ID 263649064—TRR 170. This is TRR 170 pub. No. 102.
Funders:
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)263649064
Subject Keywords:Protoplanetary disks ; Planetesimals ; Nucleosynthesis ; R-process ; S-process ; Carbonaceous chondrites ; Meteorites ; Meteorite composition ; Isotopic abundances ; Accretion
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Protoplanetary disks (1300); Planetesimals (1259); Nucleosynthesis (1131); R-process (1324); S-process (1419); Carbonaceous chondrites (200); Meteorites (1038); Meteorite composition (1037); Isotopic abundances (867)
Record Number:CaltechAUTHORS:20200716-124002307
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200716-124002307
Official Citation:Fridolin Spitzer et al 2020 ApJL 898 L2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104405
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Jul 2020 21:21
Last Modified:16 Jul 2020 21:21

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