Emily A. Pringle
Si isotope homogeneity of the solar nebula
Pringle, Emily A.; Savage, Paul S.; Jackson, Matthew G.; Barrat, Jean-Alix; Moynier, Frédéric
Authors
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. |
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Copyright Statement
© 2013. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
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