Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-13
Mon.Not.Roy.Astron.Soc.369:1939-1948,2006
Astronomy and Astrophysics
Astrophysics
11 pages, 8 figures. Acccepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10438.x
The properties of the type Ic supernova SN 1994I are re-investigated. This object is often referred to as a "standard SN Ic" although it exhibited an extremely fast light curve and unusually blue early-time spectra. In addition, the observations were affected by significant dust extinction. A series of spectral models are computed based on the explosion model CO21 (Iwamoto et al. 1994) using a Monte Carlo transport spectral synthesis code. Overall the density structure and abundances of the explosion model are able to reproduce the photospheric spectra well. Reddening is estimated to be E(B-V)=0.30 mag, a lower value than previously proposed. A model of the nebular spectrum of SN 1994I points toward a slightly larger ejecta mass than that of CO21. The photospheric spectra show a large abundance of iron-group elements at early epochs, indicating that mixing within the ejecta must have been significant. We present an improved light curve model which also requires the presence of 56Ni in the outer layers of the ejecta.
Deng Jian
Filippenko Alexei V.
Mazzali Paolo A.
Nomoto Ken
Sauer Daniel N.
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