Core-collapse supernova models including C-O shell mergers best match observed elemental ratios in Cas A, indicating mergers occur and contribute up to 20-30% of 44Ti outside the reverse shock.
Constraints on the Progenitor of Cassiopeia A
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Production of heavy $\alpha$-elements and $^{44}$Ti in Cas A: comparison to abundances from 1D core-collapse supernova models and evidence for Carbon-Oxygen shell mergers
Core-collapse supernova models including C-O shell mergers best match observed elemental ratios in Cas A, indicating mergers occur and contribute up to 20-30% of 44Ti outside the reverse shock.