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arXiv 1002.3414astro-ph.HEastro-ph.CO
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核心坍缩超新星的早期紫外光辐射

The early UV/Optical emission from core-collapse supernovae

Itay Rabinak, Eli Waxman

摘要:

我们推导出一个简单的近似模型,描述了早期,小时到天,紫外/光学超新星发射,这是由膨胀的外部<0.01太阳质量的一部分的冲击加热的信封,并之前的放射性衰变驱动的光发射。我们的模型包括一个近似的描述的时间依赖性的不透明度(主要是由于重组),和从黑体光谱的发射光谱的偏差。我们表明,早期UV/O辐射的特征限制了祖星的半径,其包络成分,以及喷出物能量与质量的比值E/M。对于He包层,忽略复合效应可能导致祖半径的高估超过一个数量级。我们还表明,在不同波长的相对消光可以推断出在这些波长的光变曲线,消除不确定性的估计祖半径由于红化(但不是E/M的不确定性,由于绝对消光)。Ib型SN 2008 D和IIp型SNLS-04 D2 dc的早期UV/O观测结果与我们的模型预测一致。对于SN 2008 D,我们发现祖半径约为。10^11厘米,这表明氦包层含有大量的C/O组分。

英文摘要:

We derive a simple approximate model describing the early, hours to days, UV/optical supernova emission, which is produced by the expansion of the outer <~0.01 solar mass part of the shock-heated envelope, and precedes the optical emission driven by radioactive decay. Our model includes an approximate description of the time dependence of the opacity (due mainly to recombination), and of the deviation of the emitted spectrum from a black body spectrum. We show that the characteristics of the early UV/O emission constrain the radius of the progenitor star, its envelope composition, and the ratio of the ejecta energy to its mass, E/M. For He envelopes, neglecting the effect of recombination may lead to an over estimate of progenitor radius by more than an order of magnitude. We also show that the relative extinction at different wavelengths may be inferred from the light-curves at these wave-lengths, removing the uncertainty in the estimate of progenitor radius due to reddening (but not the uncertainty in E/M due to uncertainty in absolute extinction). The early UV/O observations of the type Ib SN2008D and of the type IIp SNLS-04D2dc are consistent with our model predictions. For SN2008D we find progenitor radius to be approx. 10^11 cm, and an indication that the He envelope contains a significant C/O fraction.

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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