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arXiv 1309.7814astro-ph.HEastro-ph.SR
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SN 2008中Hα和Hβ之间的差异in:IIP型超新星的不均匀外层?

Disparity between Hα and Hβ in SN 2008in: inhomogeneous external layers of type IIP supernovae?

N. N. Chugai, V. P. Utrobin

摘要:

研究了SN 2008的早期光谱中Hα和Hβ的不一致性。问题是,这些线不能在具有光滑密度分布的球对称模型中同时描述。它示出的一个cluberous结构的外层的信封的假设解决了这个问题。我们得到了非均匀带内边界的速度(\approx 6100 km s^{-1})、非均匀填充因子(\leq 0.5)和非均匀层质量(~ 0.03 M_{\odot})的估计值。Hα早期谱中的通量涨落幅度(ΔF/F ~ 10^{-2})对不均匀性的大小(\leq 200 km s^{-1})施加了限制。对IIP型超新星早期Hα波动的探测可能成为对其包层不均匀结构的观测检验。我们还提出了外层团块结构的间接检验:研究由激波爆发引起的初始辐射爆发的性质。IIP型超新星外层的不均匀结构可能是前超新星红超巨星外层对流层密度扰动和密度反转的结果。

英文摘要:

We study disparity between Hα and Hβ in early spectra of the type IIP supernova SN 2008in. The point is that these lines cannot be described simultaneously in a spherically-symmetric model with the smooth density distribution. It is shown that an assumption of a clumpy structure of external layers of the envelope resolves the problem. We obtain estimates of the velocity at the inner border of the inhomogeneous zone (\approx6100 km s^{-1}), the filing factor of inhomogeneities (\leq0.5), and the mass of the inhomogeneous layers (~ 0.03 M_{\odot}). The amplitude of flux fluctuations in the early spectrum of Hα (ΔF/F ~ 10^{-2}) imposes a constraint on the size of inhomogeneities (\leq 200 km s^{-1}). A detection of fluctuations in the early Hα of type IIP supernovae might become an observational test of the inhomogeneous structure of their envelopes. We propose also the indirect test of the clumpy structure of external layers: the study of properties of the initial radiation outburst due to the shock breakout. The inhomogeneous structure of external layers of type IIP supernovae could be an outcome of density perturbations and density inversion in outer convective layers of presupernova red supergiant.

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