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Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14N/15N Ratios

Hoppe, Peter; Stancliffe, Richard J.; Pignatari, Marco; Amari, Sachiko

Authors

Peter Hoppe

Richard J. Stancliffe

Sachiko Amari



Abstract

We report high-resolution C, N, Al, Si, and S isotope data of 38 presolar SiC grains of type AB. Seventeen of these grains are of subtype AB1 (14N/15N < 440 = solar) and 20 of subtype AB2 (14N/15N ≥ 440), previously proposed to be mainly from supernovae (AB1) and J-type carbon stars (AB2), respectively. Our data are compatible with previously obtained isotope data of AB grains, except that 26Al/27Al ratios of AB1 grains span a narrower range. The data are compared with predictions from supernova models that consider H ingestion into the He shell during the pre-supernova phase. In these models a mixture of explosive H and He burning occurs at the bottom of the He shell during passage of the supernova shock, forming the so-called O/nova zone. Mixing matter from the O/nova zone with matter from the overlying He/C zone and the stellar envelope shows that the isotopic compositions and trends of both AB1 and AB2 grains can be matched within the model uncertainties. This demonstrates that supernovae should be considered as potential sources of AB2 grains, in addition to J-type carbon stars and born-again asymptotic giant branch stars, as previously proposed.

Journal Article Type Article
Publication Date Dec 10, 2019
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 887
Issue 1
Article Number 8
Pages 10
APA6 Citation Hoppe, P., Stancliffe, R. J., Pignatari, M., & Amari, S. (2019). Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14N/15N Ratios. The Astrophysical journal, 887(1), 10. https://doi.org/10.3847/1538-4357/ab521c
DOI https://doi.org/10.3847/1538-4357/ab521c
Keywords Circumstellar matter ; Meteorites ; Nucleosynthesis ; Supernovae
Publisher URL https://iopscience.iop.org/article/10.3847/1538-4357/ab521c
Additional Information Journal title: The Astrophysical Journal; Article type: paper; Article title: Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14N/15N Ratios; Copyright information: © 2019. The American Astronomical Society. All rights reserved.; Date received: 2019-07-26; Date accepted: 2019-10-27; Online publication date: 2019-12-05

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Copyright Statement
© 2019. The American Astronomical Society.







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