Comparative Direct Analysis of Type Ia Supernova Spectra

@inproceedings{Branch2005ComparativeDA,
  title={Comparative Direct Analysis of Type Ia Supernova Spectra},
  author={David Branch and Michael Troxel and David J. Jeffery and Kazuhito Hatano and Miriam Musco and Jerod T. Parrent and Edward A. Baron and Leann Chau Dang and Darrin Alan Casebeer and Nicholas Hall and Wesley Ketchum},
  year={2005}
}
A comparative study of optical spectra of Type Ia supernovae (SNe Ia) is extended, in light of new data. The discussion is framed in terms of the four groups defined in previous papers of this series: core normal (CN), broad line (BL), cool (CL), and shallow silicon (SS). Emerging features of the SN Ia spectroscopic diversity include evidence (1) that extreme CL SN 1991bg-likes are not a physically distinct subgroup and (2) for the ex- istence of a substantial number of SN 1999aa-like SSs that… 
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