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宽线Ic型超新星SN 2007 ru:增加Ic型超新星的多样性

The broad line type Ic supernova SN 2007ru: Adding to the diversity of type Ic supernovae

D. K. Sahu, Masaomi Tanaka, G. C. Anupama, Uday K. Gurugubelli, Ken'ichi Nomoto

摘要:

本文介绍了Ic型超新星SN 2007 ru直到极大期后约210天的光度和光谱演化。由于膨胀速度非常高,光谱显示出宽的光谱特征,通常在超新星中看到。光球速度比其他正常的Ic型超新星要高。在爆炸后的$\sim$ 8天,它低于SN 1998 bw,但在以后的时期,它与SN 1998 bw相当。SN 2007 ru的光变曲线演化表明,8 $\pm$ 3天的快速上升时间到$B$带最大值,最大值后的下降速度比其他宽线的Ic型超新星更快。SN 2007 ru的绝对$V$星等为-19.06等,亮度与SN 1998 bw相当,位于观测到的Ic型超新星中较亮的一端。\Nifs的喷射质量估计为$\sim0.4\Msun$。光变曲线的快速上升和下降以及高膨胀速度表明SN 2007 ru是一次具有高动能/喷出物质量比($E_{\rm K}/M_{\rm {ej}}$)的爆炸。这增加了Ic型超新星的多样性。虽然SN 2003 jd的早期相位谱与宽谱线SN 2003 jd的早期相位谱最为相似,但SN 2007 ru星云光谱中的[OI]谱线轮廓显示为单峰轮廓,而SN 2003 jd的[OI]谱线轮廓为双峰轮廓。单峰的轮廓,加上高光度和高膨胀速度,可能表明SN 2007 ru可能是一个非球面爆炸从极地方向看。估计氧丰度12 + log(O/H)为$\sim$ 8.8,表明SN 2007 ru发生在一个接近太阳金属丰度的区域。

英文摘要:

Photometric and spectral evolution of the Type Ic supernova SN 2007ru until around 210 days after maximum are presented. The spectra show broad spectral features due to very high expansion velocity, normally seen in hypernovae. The photospheric velocity is higher than other normal Type Ic supernovae. It is lower than SN 1998bw at $\sim$ 8 days after the explosion, but is comparable at later epochs. The light curve evolution of SN 2007ru indicates a fast rise time of 8$\pm$3 days to $B$ band maximum and post-maximum decline more rapid than other broad-line Type Ic supernovae. With an absolute $V$ magnitude of -19.06, SN 2007ru is comparable in brightness with SN 1998bw and lies at the brighter end of the observed Type Ic supernovae. The ejected mass of \Nifs is estimated to be $\sim0.4\Msun$. The fast rise and decline of the light curve and the high expansion velocity suggest that SN 2007ru is an explosion with a high kinetic energy/ejecta mass ratio ($E_{\rm K}/M_{\rm {ej}}$). This adds to the diversity of Type Ic supernovae. Although the early phase spectra are most similar to those of broad-line SN 2003jd, the [OI] line profile in the nebular spectrum of SN 2007ru shows the singly-peaked profile, in contrast to the doubly-peaked profile in SN 2003jd. The singly-peaked profile, together with the high luminosity and the high expansion velocity, may suggest that SN 2007ru could be an aspherical explosion viewed from the polar direction. Estimated oxygen abundance 12 + log(O/H) of $\sim$8.8 indicates that SN 2007ru occurred in a region with nearly solar metallicity.

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