光球衰退与近爆光度的再研究
Photosphere Recession and Luminosity of Homologous Explosions Revisited
摘要：
Arnett等人（1980，1982，1989）假设光球位于喷出物的最外边缘，通过分析和数值计算给出了包含复合效应的超新星同源爆炸的光变曲线。实际上，随着同系膨胀的进行，光球层会向喷出物的更深处退去。在这种情况下，光球半径在早期增加，随后减小，这可以通过Liu等人提出的简单方法来描述。为了研究光球衰退对亮度演化的影响，我们在光球上施加了一个边界条件，以确定喷出物温度的空间和时间分布，并证明了该边界条件是合理的。我们发现，光球衰退降低了光度与以前的结果相比，没有衰退，这可以用IIP型超新星的观测进行检验。
英文摘要：
By assuming the photosphere located at the outmost edge of the ejecta, Arnett et al. (1980, 1982, 1989) presented the light curves of homologous explosions in supernovae analytically and numerically to include recombination effects. Actually as homologous expansion proceeds, the photosphere recedes deeper into the ejecta. In this situation, the photosphere radius increases at early times and decreases later on which can be described by a simple method proposed by Liu et al. (2018). To study how the photosphere recession effect the luminosity evolution, we impose a boundary condition on the photosphere to determine the spatial and time distribution of the temperature of the ejecta which is clarified to be reasonable. We find that the photosphere recession reduce the luminosity compared with the previous result without the recession, which can be tested with observations of Type-IIP supernovae.
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