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arXiv 1209.4682astro-ph.HE
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与伽马射线暴有关的超新星的理论色速相关

A theoretical color-velocity correlation for supernovae associated with gamma-ray bursts

Sharon Rapoport, Stuart A. Sim, Keiichi Maeda, Masaomi Tanaka, Markus Kromer, Brian P. Schmidt, Kenichi Nomoto

摘要:

我们进行了第一次多维辐射转移计算,同时计算合成光谱和光变曲线的模型的超新星驱动的快速双极外流。这些使我们能够对颜色演化和光谱特征的取向依赖性进行自洽的预测。我们比较模型与不同程度的非球面性和金属性,并发现显着的可观察到的后果。在非球面模型中,我们发现光谱和光变曲线特征随观察者方向系统地变化。特别是,我们发现,早期阶段的光变曲线更明亮,更蓝,当靠近极轴,但峰值通量是最高的赤道(离轴)倾斜。谱线特征也系统地取决于观察者的方位,包括SiII 6355 A谱线的速度。因此,我们的模型预测线速度和颜色之间的相关性,可以帮助识别与离轴喷气驱动爆炸相关的超新星。这种相关性的幅度和范围取决于非球面的程度,金属丰度和观测的时代,但我们发现它总是存在的,并在同一方向上的行为。

英文摘要:

We carry out the first multi-dimensional radiative transfer calculations to simultaneously compute synthetic spectra and light curves for models of supernovae driven by fast bipolar outflows. These allow us to make self-consistent predictions for the orientation dependence of both colour evolution and spectral features. We compare models with different degrees of asphericity and metallicity and find significant observable consequences of both. In aspherical models, we find spectral and light curve features that vary systematically with observer orientation. In particular, we find that the early phase light curves are brighter and bluer when viewed close to the polar axis but that the peak flux is highest for equatorial (off-axis) inclinations. Spectral line features also depend systematically on observer orientation, including the velocity of the SiII 6355A line. Consequently, our models predict a correlation between line velocity and color that could assist the identification of supernovae associated with off-axis jet-driven explosions. The amplitude and range of this correlation depends on the degree of asphericity, the metallicity and the epoch of observation but we find that it is always present and acts in the same direction.

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