Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System
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Little is known about the origin of the spectral diversity of asteroids and what it says about conditions in the protoplanetary disk. Here, we show that samples returned from Cb-type asteroid Ryugu have Fe isotopic anomalies indistinguishable from Ivuna-type (CI) chondrites, which are distinct from all other carbonaceous chondrites. Iron isotopes, therefore, demonstrate that Ryugu and CI chondrites formed in a reservoir that was different from the source regions of other carbonaceous asteroids. Growth and migration of the giant planets destabilized nearby planetesimals and ejected some inward to be implanted into the Main Belt. In this framework, most carbonaceous chondrites may have originated from regions around the birthplaces of Jupiter and Saturn, while the distinct isotopic composition of CI chondrites and Ryugu may reflect their formation further away in the disk, owing their presence in the inner Solar System to excitation by Uranus and Neptune.
Originalsprog | Engelsk |
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Artikelnummer | eadd8141 |
Tidsskrift | Science Advances |
Vol/bind | 8 |
Udgave nummer | 46 |
Antal sider | 9 |
ISSN | 2375-2548 |
DOI | |
Status | Udgivet - 2022 |
Bibliografisk note
Funding Information:
This work was supported by NASA grants NNX17AE86G (LARS), 80NSSC17K0744 (HW), 000306-002 (HW), 80NSSC21K0380 (EW), and 80NSSC20K0821 (EW), NSF grant EAR-2001098 (CSEDI), and funding from DOE to Nicolas Dauphas and Kaken-hi grants to S. Tac., T. Yo., and H. Yur.
Publisher Copyright:
Copyright © 2022 The Authors, some rights reserved;
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