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Date and Time of the Query: 2019-06-20 T07:41:34 PDT
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For refcode 2007PASP..119..709B:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
2007PASP..119..709B Comparative Direct Analysis of Type Ia Supernova Spectra. III. Premaximum David Branch, M. A. Troxel, David J. Jeffery, Kazuhito Hatano, Miriam Musco, Jerod Parrent, E. Baron, Leeann Chau Dang, D. Casebeer, Nicholas Hall, and Wesley Ketchum Abstract. A comparative study of spectra of 21 Type Ia supernovae (SNe Ia) obtained about 1 week before maximum light, and 8 spectra obtained 11 or more days before maximum, is presented. To a large extent, the premaximum spectra exhibit the defining characteristics of the four groups defined in Paper II (core normal, broad line, cool, and shallow silicon). Comparisons with SYNOW synthetic spectra show that all strong features and most weak ones can be accounted for in a plausible way. The issues of detached high-velocity features, the possible ubiquity of carbon clumps, the maximum detectable ejecta velocities, and the possibility of blueshifted emission-line peaks are discussed. Key words: Supernovae
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