supernovae: individual: SN 2011fe

Analysis of the Early-time Optical Spectra of SN 2011fe in M101

The nearby Type Ia supernova (SN Ia) SN 2011fe in M101 (cz = 241 km s$^-1$) provides a unique opportunity to study the early evolution of a ``normal'' SN Ia, its compositional structure, and its elusive progenitor system. We present 18 high …