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arXiv 1306.5122astro-ph.SR
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IIP型超新星2008 in:一颗正常红超巨星的爆炸

Type IIP supernova 2008in: the explosion of a normal red supergiant

V. P. Utrobin, N. N. Chugai

摘要:

IIP型超新星的爆发能量和喷出物质量构成了爆发机制理论的基础。到目前为止,这些参数只确定了七个事件。IIP型超新星2008 in是另一个观测良好的事件,详细的流体动力学模型可以用来推导超新星参数。利用流体动力学模型描述了光球层的辐射热光变曲线和膨胀速度。氢离子化和激发的时间依赖性模型被施加到模型的H α和H β线的轮廓。我们发现一个喷出物的质量为13.6兆太阳,爆炸能量为5.05 × 10^50尔格,超新星前半径为570朗日,放射性Ni-56的质量为0.015兆太阳。估计的祖先质量为15.5 Msun。我们发现了一个问题的Halpha和Hbeta的描述在早期阶段,这是不能解决的球对称模型。SN 2008 in的前超新星是流体动力学模拟研究的8颗IIP型超新星中质量最小的正常红超巨星。在这个样本中没有祖先质量<15 Msun的IIP型超新星的问题仍然存在。

英文摘要:

The explosion energy and the ejecta mass of a type IIP supernova make up the basis for the theory of explosion mechanism. So far, these parameters have only been determined for seven events. Type IIP supernova 2008in is another well-observed event for which a detailed hydrodynamic modeling can be used to derive the supernova parameters. Hydrodynamic modeling was employed to describe the bolometric light curve and the expansion velocities at the photosphere level. A time-dependent model for hydrogen ionization and excitation was applied to model the Halpha and Hbeta line profiles. We found an ejecta mass of 13.6 Msun, an explosion energy of 5.05x10^50 erg, a presupernova radius of 570 Rsun, and a radioactive Ni-56 mass of 0.015 Msun. The estimated progenitor mass is 15.5 Msun. We uncovered a problem of the Halpha and Hbeta description at the early phase, which cannot be resolved within a spherically symmetric model. The presupernova of SN 2008in was a normal red supergiant with the minimum mass of the progenitor among eight type IIP supernovae explored by means of the hydrodynamic modeling. The problem of the absence of type IIP supernovae with the progenitor masses <15 Msun in this sample remains open.

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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