Sauer 2006 'standard' Ic SN 1994I的光变和谱

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Title:		The properties of the `standard' Type Ic supernova 1994I from spectral models
Authors:		Sauer, D. N.; Mazzali, P. A.; Deng, J.; Valenti, S.; Nomoto, K.; Filippenko, A. V.
Affiliation:		AA(INAF, Osservatorio Astronomico di Trieste, Via G. B. Tiepolo, 11, I-34131 Trieste, Italy; Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106-4030, USA), AB(), AC(), AD(European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany; Physics Department, University of Ferrara, I-44100 Ferrara, Italy), AE(), AF(Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA)
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 369, Issue 4, pp. 1939-1948. (MNRAS Homepage)
Publication Date:		07/2006
Origin:		MNRAS
MNRAS Keywords:		line: formation: line: identification: radiative transfer: supernovae: general: supernovae: individual: SN 1994I: gamma-rays: bursts
Abstract Copyright:		(c) 2006 The Authors. Journal compilation © 2006 RAS
DOI:		10.1111/j.1365-2966.2006.10438.x
Bibliographic Code:		2006MNRAS.369.1939S

Abstract

The properties of the Type Ic supernova SN 1994I are reinvestigated. 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 is computed based on the explosion model CO21 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 towards 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.

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