Emission line models for the lowest-mass core collapse supernovae. I: Case study of a 9 $M_\odot$ one-dimensional neutrino-driven explosion

Understand

A large fraction of core-collapse supernovae (CCSNe), 30-50%, are expected to originate from the low-mass end of progenitors with $M_{\rm ZAMS}~= 8-12~M_\odot$.

• However, degeneracy effects make stellar evolution modelling of such stars challenging, and few predictions for their supernova light curves and spectra have been presented.
• Here we calculate synthetic nebular spectra of a 9 $M_\odot$ Fe CCSN model exploded with the neutrino mechanism.
• The model predicts emission lines with FWHM$\sim$1000 km/s, including signatures from each deep layer in the metal core.