Centers and Institutes
Published July 14, 2023 | Version v1
Journal article Open

Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu

Creators

  • 1. National Aeronautics and Space Administration
  • 2. Lunar and Planetary Institute
  • 3. Université de Lorraine
  • 4. Tokyo Denki University
  • 5. Sorbonne Université
  • 6. Carnegie Institution for Science
  • 7. University of Tokyo
  • 8. Chinese Academy of Sciences
  • 9. Hokkaido University
  • 10. University of Copenhagen
  • 11. Universität Bayreuth
  • 12. Université Paris Cités
  • 13. Seoul National University
  • 14. University of Chicago
  • 15. University of Göttingen
  • 16. Ibaraki University
  • 17. Japan Aerospace Exploration Agency

Description

Preliminary analyses of asteroid Ryugu samples show kinship to aqueously altered CI (Ivuna-type) chondrites, suggesting similar origins. We report identification of C-rich, particularly primitive clasts in Ryugu samples that contain preserved presolar silicate grains and exceptional abundances of presolar SiC and isotopically anomalous organic matter. The high presolar silicate abundance (104 ppm) indicates that the clast escaped extensive alteration. The 5 to 10 times higher abundances of presolar SiC (~235 ppm), N-rich organic matter, organics with N isotopic anomalies (1.2%), and organics with C isotopic anomalies (0.2%) in the primitive clasts compared to bulk Ryugu suggest that the clasts formed in a unique part of the protoplanetary disk enriched in presolar materials. These clasts likely represent previously unsampled outer solar system material that accreted onto Ryugu after aqueous alteration ceased, consistent with Ryugu's rubble pile origin.

Notes

Due to the large number of authors, only the first 20 and the University of Chicago authors are included on the above author list. Please download the article for the complete list of authors.

Data availability

All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Data of Hayabusa2 sample and other data from the mission are available at the JAXA Data Archives and Transmission System (DARTS) archive at https://darts.isas.jaxa.jp/curation/hayabusa2 and https://darts.isas.jaxa.jp/planet/project/hayabusa2/.

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Additional details

Identifiers

DOI
10.1126/sciadv.adh1003
Other
oai:uchicago.tind.io:10909

Funding

NASA
NNH15ZDA001N

UChicago Information

Division(s)
Physical Sciences Division
Department(s)
Enrico Fermi Institute, Geophysical Sciences