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arXiv 1709.05573astro-ph.HE
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发光型IIP SN 2013 ej,具有高速Ni-56喷出物

Luminous type IIP SN 2013ej with high-velocity Ni-56 ejecta

V. P. Utrobin, N. N. Chugai

摘要:

我们探索了观测良好的IIP SN 2013 ej,具有独特的光度演化。发现流体动力学模型无法详细再现高原和放射性尾部的热光度。然而,喷出物的质量为23-26兆太阳,动能为(1.2-1.4)× 10^51尔格,这一点还是相当有把握地确定的。我们认为,在流体动力学模拟中揭示的争议源于Ni-56喷出物的强非球面性。对不对称星云H-α线和特有的放射性尾的分析,使恢复不对称双极Ni-56喷出物的参数成为可能,较重的喷流位于后半球。推断出的Ni-56质量为0.039 Msun,是根据早期放射性尾的辐射热光度直接估计的两倍。喷射出的大部分Ni-56的速度在4000-6500 km/s的范围内。由双极Ni-56喷出物产生的非对称电离模型预测的线性极化与观测值是一致的。

英文摘要:

We explore the well-observed type IIP SN 2013ej with peculiar luminosity evolution. It is found that the hydrodynamic model cannot reproduce in detail the bolometric luminosity at both the plateau and the radioactive tail. Yet the ejecta mass of 23-26 Msun and the kinetic energy of (1.2-1.4)x10^51 erg are determined rather confidently. We suggest that the controversy revealed in hydrodynamic simulations stems from the strong asphericity of the Ni-56 ejecta. An analysis of the asymmetric nebular H-alpha line and of the peculiar radioactive tail made it possible to recover parameters of the asymmetric bipolar Ni-56 ejecta with the heavier jet residing in the rear hemisphere. The inferred Ni-56 mass is 0.039 Msun, twice as large compared to a straightforward estimate from the bolometric luminosity at the early radioactive tail. The bulk of ejected Ni-56 has velocities in the range of 4000-6500 km/s. The linear polarization predicted by the model with the asymmetric ionization produced by bipolar Ni-56 ejecta is consistent with the observational value.

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