Isotopic ratios for C, N, Si, Al, and Ti in C-rich presolar grains from massive stars

Abstract

Certain types of silicon carbide (SiC) grains, e.g., SiC-X grains, and low density (LD) graphites are C-rich presolar grains that are thought to have condensed in the ejecta of core-collapse supernovae (CCSNe). In this work we compare C, N, Al, Si, and Ti isotopic abundances measured in presolar grains with the predictions of 21 CCSN models. The impact of a range of SN explosion energies is considered, with the high energy models favouring the formation of a C/Si zone enriched in ${}^{12}$C, ${}^{28}$Si, and ${}^{44}$Ti. Eighteen of the 21 models have H ingested into the He-shell and different abundances of H remaining from such H-ingestion. CCSN models with intermediate to low energy (that do not develop a C/Si zone) cannot reproduce the ${}^{28}$Si and ${}^{44}$Ti isotopic abundances in grains without assuming mixing with O-rich CCSN ejecta. The most ${}^{28}$Si-rich grains are reproduced by energetic models when material from the C/Si zone is mixed with surrounding C-rich material, and the observed trends of the ${}^{44}$Ti/${}^{48}$Ti and ${}^{49}$Ti/${}^{48}$Ti ratios are consistent with the C-rich C/Si zone. For the models with H-ingestion, high and intermediate explosion energies allow the production of enough ${}^{26}$Al to reproduce the ${}^{26}$Al/${}^{27}$Al measurements of most SiC-X and LD graphites. In both cases, the highest ${}^{26}$Al/${}^{27}$Al ratio is obtained with H still present at $X_H\approx 0.0024$ in He-shell material when the SN shock is passing. The existence of H in the former convective He-shell points to late H-ingestion events in the last days before massive stars explode as a supernova.

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