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Burns, N. A. Walton, N. Regnault, O. Perdereau, P. Astier, P. E. Nugent, P. Ruiz-Lapuente, R. A. Knop, R. Amanullah, R. Ellis, R. Gibbons, R. Pain, R. Quimby, S. E. Deustua, S. Fabbro, S. Kent, S. Nobili, S. Perlmutter, T. Dahlen, V. Prasad, V. Stanishev, W. M. Wood-Vasey (The Supernova Cosmology Project), X. Fan","submitted_at":"2004-04-20T19:35:12Z","abstract_excerpt":"We present an extensive new time-series of spectroscopic data of the peculiar SN 1999aa in NGC 2595. Our data set includes 25 optical spectra between -11 and +58 days with respect to B-band maximum light, providing an unusually complete time history. The early spectra resemble those of a SN 1991T-like object but with a relatively strong Ca H&K absorption feature. The first clear sign of Si II 6355, characteristic of Type Ia supernovae, is found at day -7 and its velocity remains constant up to at least the first month after B-band maximum light. 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