期刊
SCIENCE ADVANCES
卷 4, 期 1, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aao1054
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资金
- NASA [NNX10AI63G, NNX17AE28G]
- NASA [NNX10AI63G, 131503] Funding Source: Federal RePORTER
We have found that individual presolar silicon carbide (SiC) dust grains from supernovae show a positive correlation between Ti-49 and Si-28 excesses, which is attributed to the radioactive decay of the short-lived (t(1/2) = 330 days) 49V to Ti-49 in the inner highly Si-28- rich Si/S zone. The V-49-Ti-49 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.
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