Stellar Origins of Extremely ${}^{\text{13}}C$- and ${}^{15}N$-enriched Presolar SiC Grains: Novae or Supernovae?

Nan Liu, Larry R. Nittler, Conel M. O'D. Alexander +4

Extreme excesses of ${}^{13}C$ (${}^{12}C$/${}^{13}C$<10) and ${}^{15}N$ (${}^{14}N$/${}^{15}N$<20) in rare presolar SiC grains have been considered diagnostic of an origin in classical novae,…