Comparative Direct Analysis of Type Ia Supernova Spectra. III. Premaximum
Publications of the Astronomical Society of the Pacific2007Vol. 119(857), pp. 709–721
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David Branch, M. A. Troxel, David J. Jeffery, K. Hatano, Miriam Musco, J. Parrent, E. Baron, Leeann Chau Dang, D. Casebeer, Nicholas R. Hall, Wesley Ketchum
Abstract
A comparative study of spectra of 21 Type Ia supernovae (SNe Ia) obtained about one 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.
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