以LSQ13cuw为例对II-P和II-L型超新星上升时间的比较研究
A comparative study of Type II-P and II-L supernova rise times as exemplified by the case of LSQ13cuw
摘要：
我们报告我们的研究结果的基础上分析的观察II-L型超新星LSQ 13 cuw的核心坍缩超新星爆炸的物理预测框架内。LSQ 13 cuw是在爆炸后一天内被发现的，这在II-L型超新星中是前所未有的。这激发了对II-P型和II-L型超新星的比较研究，这些超新星具有相对较好的爆炸时期和最大（光学）光的上升时间。从我们的20个这样的事件的样本中，我们发现了上升的持续时间和峰值亮度之间正相关的证据。平均而言，SNe II-L倾向于比SNe II-P具有更亮的峰值幅度和更长的上升时间。使用两种不同的分析模型，我们进行了参数研究，调查控制上升时间行为的物理参数。一般来说，模型在质量上再现了观察到的趋势的各个方面。我们发现，光学峰的亮度增加较大的祖半径和爆炸能量，并降低较大的质量。上升时间对质量和爆炸能量的依赖性小于对原始半径的依赖性。我们没有发现SNe II-L的祖细胞比SNe II-P的祖细胞具有显著更小的半径的证据。
英文摘要：
We report on our findings based on the analysis of observations of the Type II-L supernova LSQ13cuw within the framework of currently accepted physical predictions of core-collapse supernova explosions. LSQ13cuw was discovered within a day of explosion, hitherto unprecedented for Type II-L supernovae. This motivated a comparative study of Type II-P and II-L supernovae with relatively well-constrained explosion epochs and rise times to maximum (optical) light. From our sample of twenty such events, we find evidence of a positive correlation between the duration of the rise and the peak brightness. On average, SNe II-L tend to have brighter peak magnitudes and longer rise times than SNe II-P. However, this difference is clearest only at the extreme ends of the rise time versus peak brightness relation. Using two different analytical models, we performed a parameter study to investigate the physical parameters that control the rise time behaviour. In general, the models qualitatively reproduce aspects of the observed trends. We find that the brightness of the optical peak increases for larger progenitor radii and explosion energies, and decreases for larger masses. The dependence of the rise time on mass and explosion energy is smaller than the dependence on the progenitor radius. We find no evidence that the progenitors of SNe II-L have significantly smaller radii than those of SNe II-P.
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