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arXiv 1907.05166astro-ph.HE
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由正向和反向冲击提供动力的I型In超新星光变曲线

Type IIn Supernova Light Curves Powered by Forward and Reverse Shocks

Daichi Tsuna, Kazumi Kashiyama, Toshikazu Shigeyama

摘要:

本文提出了一个由超新星喷出物与星周介质碰撞提供动力的IIn型超新星的辐射热光变曲线模型。我们估计的转换效率的喷出物的动能的辐射在反向和正向冲击,并发现,一个大的密度对比,使效率的差异。反向激波的辐射可以在很长时间内保持高效率,在光变曲线的后期变得重要。我们首先构建了一个半解析模型,适用于后期阶段的光变曲线时,光子在冲击区域的扩散时间变得可以忽略不计。我们进一步开发辐射传输模拟,将这些物理过程纳入光变曲线。数值计算预测的光变曲线在早期阶段,这是测试目前和未来的短节奏调查。我们比较我们的模型与测辐射热光变曲线的观测IIn型超新星2005IP。由于前向激波的效率降低,我们从我们的模型中发现,对于$100\ {\rm km \ s^{-1}}$的风速,祖星的质量损失率为$\approx 1\times 10^{-2}\ {\rm M_\odot \ yr^{-1}}$,比以前使用简单假设效率的工作高出一个数量级。这突出了在从观测中提取物理参数时考虑这两个组成部分的重要性。

英文摘要:

We present a bolometric light curve model of Type IIn supernovae powered by supernova ejecta colliding with a circumstellar medium. We estimate the conversion efficiency of the ejecta's kinetic energy to radiation at the reverse and forward shocks and find that a large density contrast makes a difference in the efficiency. The emission from the reverse shock can maintain high efficiency for a long time, and becomes important at the late phase of the light curve. We first construct a semi-analytical model that is applicable to the late phase of the light curve when the diffusion time of photons in the shocked region becomes negligible. We further develop radiation transfer simulations that incorporate these physical processes into the light curve. The numerical calculations predict light curves at early phases, which are testable by present and future short-cadence surveys. We compare our model with the bolometric light curve constructed from observations for a type IIn supernova 2005ip. Due to the reduced efficiency at the forward shock, we find from our model that the mass-loss rate of the progenitor star was $\approx 1\times 10^{-2}\ {\rm M_\odot \ yr^{-1}}$ for a wind velocity of $100\ {\rm km \ s^{-1}}$, an order of magnitude higher compared to previous work that used simple assumptions of the efficiency. This highlights the importance of taking these two components into account when extracting the physical parameters from observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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