On the High-Velocity Ejecta of the Type Ia Supernova SN 1994D
On the High-Velocity Ejecta of the Type Ia Supernova SN 1994D
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DOI：
10.1086/307947
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发表时间：
1999-03
期刊：
影响因子：
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通讯作者：
K. Hatano;D. Branch;A. Fisher;E. Baron;A. Filippenko
中科院分区：
文献类型：
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作者：
K. Hatano;D. Branch;A. Fisher;E. Baron;A. Filippenko
合成光谱产生的参数化超新星合成光谱代码SYNOW的光谱Ia型SN 1994 D之前获得的最大亮度的时间进行比较。发现了存在双组分Fe II和Ca II特征的证据，形成于高速（≥ 20，000 km s-1）和低速（≤ 16，000 km s-1）物质中。可能的解释，这些光谱分裂，和使用早期光谱的Ia型超新星探测的金属丰度的祖白色矮星和核燃烧前的爆炸外层的性质的影响，进行了讨论。
Synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW are compared with 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 (≥20,000 km s-1) and lower velocity (≤16,000 km s-1) matter. Possible interpretations of these spectral splits, and implications for using early-time spectra of Type Ia supernovae 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.