3 years ago

Late formation of silicon carbide in type II supernovae

Conel M. O’D. Alexander, Larry R. Nittler, Nan Liu, Jianhua Wang

We have found that individual presolar silicon carbide (SiC) dust grains from supernovae show a positive correlation between 49Ti and 28Si excesses, which is attributed to the radioactive decay of the short-lived (t1/2 = 330 days) 49V to 49Ti in the inner highly 28Si-rich Si/S zone. The 49V-49Ti chronometer shows that these supernova SiC dust grains formed at least 2 years after their parent stars exploded. This result supports recent dust condensation calculations that predict a delayed formation of carbonaceous and SiC grains in supernovae. The astronomical observation of continuous buildup of dust in supernovae over several years can, therefore, be interpreted as a growing addition of C-rich dust to the dust reservoir in supernovae.

Publisher URL: http://advances.sciencemag.org/cgi/content/short/4/1/eaao1054

DOI: 10.1126/sciadv.aao1054

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