Seven-Layer Supernova Mixtures Reproducing Isotopic Ratios of Presolar Grains

Details Seven-Layer Supernova Mixtures Reproducing Isotopic Ratios of Presolar Grains Seven-Layer Supernova Mixtures Reproducing Isotopic Ratios of Presolar Grains

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..847..500y&link_type=abstract

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: International Symposium on Origin of Matter and Evolution of Galaxies 2005: New Hori

Astronomy and Astrophysics

Astrophysics

Supernovae, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

We investigate supernova mixtures reproducing isotopic ratios of individual presolar grains from supernovae. We divide the supernova ejecta of 3.3, 4, 6, and 8 Msolar He star models into seven layers, i.e., the Ni, Si/S, O/Ne, C/O (3.3 and 4 Msolar models) or O/C (6 and 8 Msolar models), He/C, and He/N layers. Then, we seek the mixing ratios of the mixtures reproducing the isotopic ratios of 12C/13C, 14N/15N, 16O/17O, 16O/18O, 26Al/27Al, 29Si/28Si, 30Si/28Si, and 44Ti/48Ti as many as possible measured in a low density graphite grain KE3a-322. Six isotopic ratios of the grain are reproduced by two mixtures of 4 Msolar model and a mixture of 6 Msolar model. The main component of the mixtures is the He/N layer to reproduce 12C/13C ratio and to be the C/O ratio of the mixtures slightly larger than unity. However, 14N/15N is not reproduced by the mixtures. Isotopic ratios of 16O/17O and 16O/18O are reproduced by containing the He/C- and He/N-layer components in the mixtures. The Si/S layer should be contained to reproduce the excess of 28Si and the mixing ratio is smaller than 1 × 10-4 for this grain. The Ni layer can be contained to reproduce 26Al/27Al. However, too much contribution of the Ni layer raises 44Ti/48Ti in mixtures.

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