On the High--Velocity Ejecta of the Type Ia Supernova 1994D

Details On the High--Velocity Ejecta of the Type Ia Supernova 1994D On the High--Velocity Ejecta of the Type Ia Supernova 1994D

1999-03-22

arxiv.org/abs/astro-ph/9903333v2

Astronomy and Astrophysics

Astrophysics

15 pages, 3 figures, 3 tables, Astrophysical Journal, in press

Scientific paper

10.1086/307947

Synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW are compared to spectra of the Type Ia SN 1994D that were obtained before the time of maximum brightness. Evidence is found for the presence of two-component Fe II and Ca II features, forming in high velocity ($\ge 20,000$ \kms) and lower velocity ($\le 16,000$ \kms) matter. Possible interpretations of these spectral splits, and implications for using early--time spectra of SNe Ia to probe the metallicity of the progenitor white dwarf and the nature of the nuclear burning front in the outer layers of the explosion, are discussed.

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