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arXiv 2407.12554astro-ph.HE
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大质量恒星爆炸的冲击冷却辐射:III. 蓝超巨星

Shock cooling emission from explosions of massive stars: III. Blue Super Giants

J. Morag, N. Sapir, E. Waxman

AI总结:

本文为蓝超巨星爆炸的冲击冷却辐射提供了解析公式,经多群计算校准,光度与色温精度达10%和5%,光谱能量分布精度约20-40%。

摘要:

核心坍缩超新星爆发后最初几小时到几天内的光发射,主要由从膨胀的冲击加热包层中逃逸的光子主导。在之前的论文中,我们为红超巨星(RSGs)的爆炸(具有对流多方球包层,且无显著星周介质)提供了时变光度 $L$、色温 $T_{\rm col}$ 的简单解析描述,以及低频($hν< 3T_{\rm col}$)下光谱偏离黑体的小偏差($\simeq10\\%$)和 $hν> 3T_{\rm col}$ 时的“线阻尼”效应。本文我们将工作扩展到具有辐射多方球包层的蓝超巨星爆炸,提供类似的解析公式。这些解析公式针对广泛的前身星参数(质量、半径、核/包层质量比)和爆炸能量,通过大量球对称多群(频率相关)计算进行校准。在这些计算中,我们使用了我们构建并公开的不透明度表,其中包含了束缚-束缚和束缚-自由跃迁的贡献。它们对数值 $L$ 和 $T_{\rm col}$ 的复现精度分别在10%和5%以内,对光谱能量分布的精度在 $\sim20-40\\%$ 以内。该精度与RSG爆炸所达到的精度相当。

英文摘要:

Light emission in the first hours and days following core-collapse supernovae is dominated by the escape of photons from the expanding shock-heated envelope. In preceding papers, we provided a simple analytic description of the time-dependent luminosity, $L$, and color temperature, $T_{\rm col}$, as well as of the small ($\simeq10\%$) deviations of the spectrum from blackbody at low frequencies, $hν< 3T_{\rm col}$, and of `line dampening' at $hν> 3T_{\rm col}$, for explosions of red supergiants (RSGs) with convective polytropic envelopes (without significant circum-stellar medium). Here, we extend our work to provide similar analytic formulae for explosions of blue supergiants with radiative polytropic envelopes. The analytic formulae are calibrated against a large set of spherically symmetric multi-group (frequency-dependent) calculations for a wide range of progenitor parameters (mass, radius, core/envelope mass ratios) and explosion energies. In these calculations we use the opacity tables we constructed (and made publicly available), that include the contributions of bound-bound and bound-free transitions. They reproduce the numeric $L$ and $T_{\rm col}$ to within 10\% and 5\% accuracy, and the spectral energy distribution to within $\sim20-40\%$. The accuracy is similar to that achieved for RSG explosions.

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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