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arXiv 1306.5490astro-ph.HEastro-ph.COastro-ph.SR
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一颗明亮且快速膨胀的Ib型超新星SN 2012 au

A Luminous and Fast-Expanding Type Ib Supernova SN 2012au

K. Takaki, K. S. Kawabata, M. Yamanaka, K. Maeda, M. Tanaka, H. Akitaya, Y. Fukazawa, R. Itoh, K. Kinugasa, Y. Moritani, T. Ohsugi, M. Sasada, M. Uemura, I. Uen… 展开作者

K. Takaki, K. S. Kawabata, M. Yamanaka, K. Maeda, M. Tanaka, H. Akitaya, Y. Fukazawa, R. Itoh, K. Kinugasa, Y. Moritani, T. Ohsugi, M. Sasada, M. Uemura, I. Ueno, T. Ui, T. Urano, M. Yoshida, K. Nomoto

摘要:

本文报道了一颗明亮的Ib型超新星SN 2012 au的光度和光谱观测结果,观测时间为极大值后-6 ~+150d。它的早期R波段光变曲线的形状与一般的Ib/c型超新星相似。峰值绝对星等为M_R=-18.7+-0.2等,表明该超新星属于Ib型超新星中一个非常明亮的类群。He I λ5876的线速度在最大值附近约为15,000 km/s,比典型的Ib型超新星快得多。根据准测辐射热峰值光度(6.7+-1.3 x10 ^(42)erg/s),我们估计爆炸过程中产生的\Ni质量约为0.30 Msun。我们也给出了一个粗略的约束,喷出物的质量为5-7 Msun和动能为(7-18)× 10 ^(51)erg。我们发现Ib型超新星的峰值绝对星等与He I速度之间存在弱相关。根据光变曲线模型推断,SN 2012 au与SN 1998 bw在密度结构上的相似性,以及大的峰值热光度,都表明SN 2012 au具有类似于高能Ic型超新星的性质。

英文摘要:

We present a set of photometric and spectroscopic observations of a bright Type Ib supernova SN 2012au from -6d until ~+150d after maximum. The shape of its early R-band light curve is similar to that of an average Type Ib/c supernova. The peak absolute magnitude is M_R=-18.7+-0.2 mag, which suggests that this supernova belongs to a very luminous group among Type Ib supernovae. The line velocity of He I λ5876 is about 15,000 km/s around maximum, which is much faster than that in a typical Type Ib supernova. From the quasi-bolometric peak luminosity of (6.7+-1.3)x10^(42) erg/s, we estimate the \Ni mass produced during the explosion as ~0.30 Msun. We also give a rough constraint to the ejecta mass 5-7 Msun and the kinetic energy (7-18)x10^(51) erg. We find a weak correlation between the peak absolute magnitude and He I velocity among Type Ib SNe. The similarities to SN 1998bw in the density structure inferred from the light curve model as well as the large peak bolometric luminosity suggest that SN 2012au had properties similar to energetic Type Ic supernovae.

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