Skip to main content

Research Repository

Advanced Search

Si isotope homogeneity of the solar nebula

Pringle, Emily A.; Savage, Paul S.; Jackson, Matthew G.; Barrat, Jean-Alix; Moynier, Frédéric

Si isotope homogeneity of the solar nebula Thumbnail


Authors

Emily A. Pringle

Paul S. Savage

Matthew G. Jackson

Jean-Alix Barrat

Frédéric Moynier



Abstract

The presence or absence of variations in the mass-independent abundances of Si isotopes in bulk meteorites provides important clues concerning the evolution of the early solar system. No Si isotopic anomalies have been found within the level of analytical precision of 15 ppm in 29Si/28Si across a wide range of inner solar system materials, including terrestrial basalts, chondrites, and achondrites. A possible exception is the angrites, which may exhibit small excesses of 29Si. However, the general absence of anomalies suggests that primitive meteorites and differentiated planetesimals formed in a reservoir that was isotopically homogenous with respect to Si. Furthermore, the lack of resolvable anomalies in the calcium-aluminum-rich inclusion measured here suggests that any nucleosynthetic anomalies in Si isotopes were erased through mixing in the solar nebula prior to the formation of refractory solids. The homogeneity exhibited by Si isotopes may have implications for the distribution of Mg isotopes in the solar nebula. Based on supernova nucleosynthetic yield calculations, the expected magnitude of heavy-isotope overabundance is larger for Si than for Mg, suggesting that any potential Mg heterogeneity, if present, exists below the 15 ppm level.

Citation

Pringle, E. A., Savage, P. S., Jackson, M. G., Barrat, J., & Moynier, F. (2013). Si isotope homogeneity of the solar nebula. Astrophysical Journal, 779(2), Article 123. https://doi.org/10.1088/0004-637x/779/2/123

Journal Article Type Article
Acceptance Date Oct 15, 2013
Publication Date Dec 20, 2013
Deposit Date Apr 23, 2015
Publicly Available Date Mar 28, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 779
Issue 2
Article Number 123
DOI https://doi.org/10.1088/0004-637x/779/2/123
Keywords Astrochemistry, Minor planets, asteroids: general, Nuclear reactions, nucleosynthesis, abundances, Planets and satellites: formation, Protoplanetary disks.

Files

Published Journal Article (280 Kb)
PDF

Copyright Statement
© 2013. The American Astronomical Society. All rights reserved. Printed in the U.S.A.




You might also like



Downloadable Citations