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Verfasst von:Hoppe, Peter [VerfasserIn]   i
 Leitner, Jan [VerfasserIn]   i
 Pignatari, Marco [VerfasserIn]   i
 Amari, Sachiko [VerfasserIn]   i
Titel:New constraints for supernova models from presolar silicon carbide X grains with very high 26Al/27Al ratios
Verf.angabe:Peter Hoppe, Jan Leitner, Marco Pignatari, and Sachiko Amari
E-Jahr:2023
Jahr:2023 February 1
Umfang:6 S.
Illustrationen:Illustrationen
Fussnoten:Die Zahlen "26" und "27" erscheinen im Titel hochgestellt ; Gesehen am 23.11.2023
Titel Quelle:Enthalten in: The astrophysical journal / 2
Ort Quelle:London : Institute of Physics Publ., 1995
Jahr Quelle:2023
Band/Heft Quelle:943(2023), 2, Artikel-ID L22, Seite 1-6
ISSN Quelle:2041-8213
Abstract:We report C, N, Mg-Al, Si, and S isotope data of six 1-3 μm-sized SiC grains of Type X from the Murchison CM2 chondrite, believed to have formed in the ejecta of core-collapse supernova (CCSN) explosions. Their C, N, and Si isotopic compositions are fully compatible with previously studied X grains. Magnesium is essentially monoisotopic 26Mg which gives clear evidence for the decay of radioactive 26Al. Inferred initial 26Al/27Al ratios are between 0.6 and 0.78 which is at the upper end of previously observed ratios of X grains. Contamination with terrestrial or solar system Al apparently is low or absent, which makes the X grains from this study particularly interesting and useful for a quantitative comparison of Al isotope data with predictions from supernova models. The consistently high 26Al/27Al ratios observed here may suggest that the lower 26Al/27Al ratios of many X grains from the literature are the result of significant Al contamination and in part also of an improper quantification of 26Al. The real dispersion of 26Al/27Al ratios in X grains needs to be explored by future studies. The high observed 26Al/27Al ratios in this work provide a crucial constraint for the production of 26Al in CCSN models. We explored different CCSN models, including both “classical” and H ingestion CCSN models. It is found that the classical models cannot account for the high 26Al/27Al ratios observed here; in contrast, H ingestion models are able to reproduce the 26Al/27Al ratios along with C, N, and Si isotopic ratios reasonably well.
DOI:doi:10.3847/2041-8213/acb157
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: https://doi.org/10.3847/2041-8213/acb157
 kostenfrei: Volltext: https://iopscience.iop.org/article/10.3847/2041-8213/acb157
 DOI: https://doi.org/10.3847/2041-8213/acb157
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1839861738
Verknüpfungen:→ Zeitschrift

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