三维脉冲反爆轰模型的详细谱模拟：镍含量过高
Detailed Spectral Modeling of a 3-D Pulsating Reverse Detonation Model: Too Much Nickel
摘要：
我们计算了详细的NLTE合成光谱的脉动反爆轰（PRD）模型，一种新的爆炸机制Ia型超新星。虽然水力模型是在3-D中计算的，但光谱使用角度平均水力模型，因此丢失了一些3-D细节，但总体平均值应该是平均观测光谱的良好表示。我们研究了3个时期的模型：最大光照，最大光照前7天，最大光照后5天。在最大值时，定义Si II的特征是突出的，但也有一个突出的C II特征，通常在接近最大值的正常Ia超新星中观察不到。我们比较了SN 2006D的早期光谱，它确实显示出突出的C II特征，但与观测结果的拟合并不令人信服。最后与SN 1992 A的后极大紫外光谱进行了比较。由于光谱覆盖范围很广，很明显，模型外部的铁峰元素将太多的通量推向红色，因此研究的特定PRD实现本质上比观测到的Ia超新星要红得多。我们简要地讨论了可以改善未来PRD模型的变化。
英文摘要：
We calculate detailed NLTE synthetic spectra of a Pulsating Reverse Detonation (PRD) model, a novel explosion mechanism for Type Ia supernovae. While the hydro models are calculated in 3-D, the spectra use an angle averaged hydro model and thus some of the 3-D details are lost, but the overall average should be a good representation of the average observed spectra. We study the model at 3 epochs: maximum light, seven days prior to maximum light, and 5 days after maximum light. At maximum the defining Si II feature is prominent, but there is also a prominent C II feature, not usually observed in normal SNe Ia near maximum. We compare to the early spectrum of SN 2006D which did show a prominent C II feature, but the fit to the observations is not compelling. Finally we compare to the post-maximum UV+optical spectrum of SN 1992A. With the broad spectral coverage it is clear that the iron-peak elements on the outside of the model push too much flux to the red and thus the particular PRD realizations studied would be intrinsically far redder than observed SNe Ia. We briefly discuss variations that could improve future PRD models.
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