arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.01832astro-ph.HEastro-ph.SR
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II型高原超新星光变曲线辐射输运模拟的矩基方法和蒙特卡罗方法的比较

Comparing Moment-Based and Monte Carlo Methods of Radiation Transport Modeling for Type II-Plateau Supernova Light Curves

Benny T. -H. Tsang, Jared A. Goldberg, Lars Bildsten, Daniel Kasen

摘要:

来自核心坍缩超新星的随时间变化的电磁特征是通过恒星喷出物的冲击沉积和放射性能量辐射的详细传输的结果。由于基础辐射过程的复杂性,相当大的近似,以简化辐射传输问题的关键方面。我们提出了一个系统的比较基于矩的辐射流体动力学代码STELLA和蒙特卡罗辐射输运代码Sedona在II型高原超新星的一维建模。基于恒星天体物理学实验模块(MESA)仪器生成的爆炸模型,我们发现模拟的光变曲线和喷出物结构热演化具有显著的一致性,肯定了两种辐射输运模拟方法的保真度。在Sedona用Monte Carlo方法直接计算的辐射矩也验证了基于矩的方法的准确性。我们发现,在STELLA的不透明度表和数值近似的粗分辨率产生的测辐射热光变曲线的影响微不足道,使其成为一个有效的工具,光学光变曲线建模的特定任务。

英文摘要:

Time-dependent electromagnetic signatures from core-collapse supernovae are the result of detailed transport of the shock-deposited and radioactively-powered radiation through the stellar ejecta. Due to the complexity of the underlying radiative processes, considerable approximations are made to simplify key aspects of the radiation transport problem. We present a systematic comparison of the moment-based radiation hydrodynamical code STELLA and the Monte Carlo radiation transport code Sedona in the 1D modeling of Type II-Plateau supernovae. Based on explosion models generated from the Modules for Experiments in Stellar Astrophysics (MESA) instrument, we find remarkable agreements in the modeled light curves and the ejecta structure thermal evolution, affirming the fidelity of both radiation transport modeling approaches. The radiative moments computed directly by the Monte Carlo scheme in Sedona also verify the accuracy of the moment-based scheme. We find that the coarse resolutions of the opacity tables and the numerical approximations in STELLA have insignificant impact on the resulting bolometric light curves, making it an efficient tool for the specific task of optical light curve modeling.

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