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Date and Time of the Query: 2019-06-18 T12:03:50 PDT
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For refcode 2011PASP..123..765D:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
2011PASP..123..765D Comparative Analysis of Peculiar Type Ia 1991bg-like Supernovae Spectra Doull, Brandon A.; Baron, E. Abstract. Spectroscopic analyses of Type Ia supernovae have shown that there exist four spectroscopic groups-cool, broad line, shallow silicon, and core normal-defined by the widths of the Si II features {lambda}5972 and {lambda}6355. The 1991bg-like SNe Ia are classified as "cool." Cool SNe Ia are dim, undergo a rapid decline in luminosity, and produce significantly less ^56^Ni than normal Type Ia supernovae. They also have an unusually deep and wide trough in their spectra at around 4200 A and a relatively strong Si II absorption attributed to {lambda}5972. We examine the spectra of supernova (SN) 1991bg and the cool SN 1997cn, SN 1999by, and SN 2005bl using the highly parameterized synthetic spectrum code SYNOW, and we find general agreement with similar spectroscopic studies. Our analysis reveals that this group of supernovae is fairly homogeneous, with many of the blue spectral features well fit by Fe II. The nature of the spectroscopic commonalities and the variations in the class are discussed. Finally, we examine intermediates such as SN 2004eo and discuss the spectroscopic subgroup distribution of Type Ia supernovae. Key words: Supernovae
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