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arXiv 1402.4477astro-ph.HE
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穿过厚Wolf-Rayet风的超新星激波爆发的光谱和光变曲线

Spectrum and light curve of a supernova shock breakout through a thick Wolf-Rayet wind

Gilad Svirski, Ehud Nakar

备注：
11 pages, 4 figures, submitted to apj
发表信息：
ApJ, 788, 113, 2014
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摘要：

沃尔夫-拉叶星已知会喷出风。因此，当沃尔夫-拉叶星爆炸成为超新星时，一个快速的，$>30,000$ km/s的激波预计将通过风驱动。我们研究了预期的信号从一个快速的超新星冲击波传播通过光学厚风，并发现，后面的电子被驱动到风中的冲击有效地冷却，逆康普顿软光子沉积的辐射介导的冲击，穿过恒星。因此，测辐射热光度是可比的动能通量通过冲击，和频谱被发现是一个幂律，其斜率和频率范围取决于软光子的数量流量可用于冷却。沃尔夫-拉叶超新星在浓密的风中爆炸，具有高通量的软光子，产生平坦的光谱$νF_ν=Const$，在X射线范围$0.1\lesssim T\lesssim 50$ keV。当冲击波膨胀成光学上稀薄的风时，软光子不再能够冷却穿过风的冲击波，并且大部分发射以标准核心坍缩超新星（没有风）的形式出现。然而，一小部分软光子被冲击风向上散射，并产生短暂的独特X射线特征。

英文摘要：

Wolf-Rayet stars are known to eject winds. Thus, when a Wolf-Rayet star explodes as a supernova, a fast, $>30,000$ km/s, shock is expected to be driven through a wind. We study the signal expected from a fast supernova shock propagating through an optically thick wind, and find that the electrons behind the shock driven into the wind are cooled efficiently, by inverse Compton over soft photons that were deposited by the radiation mediated shock that crossed the star. Therefore, the bolometric luminosity is comparable to the kinetic energy flux through the shock, and the spectrum is found to be a power-law, which slope and frequency range depend on the number flux of soft photons available for cooling. Wolf-Rayet supernovae that explode through a thick wind have a high flux of soft photons, producing a flat spectrum, $νF_ν=Const$, in the X-ray range $0.1\lesssim T\lesssim 50$ keV. As the shock expands into an optically thin wind, the soft photons are no longer able to cool the shock that plows through the wind, and the bulk of the emission takes the form of a standard core-collapse supernova (without a wind). However, a small fraction of the soft photons is upscattered by the shocked wind and produces a transient unique X-ray signature.

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