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arXiv 1104.0754astro-ph.HE
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Ic型超新星SN 2007 gr的离轴相对论性喷流模型

An Off-Axis Relativistic Jet Model for the Type Ic supernova SN 2007gr

M. Xu, S. Nagataki, Y. F. Huang

摘要:

提出了一个Ic型超新星SN 2007 gr的离轴相对论性喷流模型。爆炸中的大部分能量($\sim2\times10^{51}$ erg)包含在产生超新星的非相对论性喷出物中。光发射来自于在体SN喷出物中合成的$\rm ^{56}Ni$的衰变过程。初始速度约为光速的0.94倍的相对论性喷流中只含有非常少的能量($\sim10^{48}$ erg)。无线电和X射线发射来自这个相对论性喷流。利用沃尔夫-拉叶星(Ic型SN的祖先)的一些典型参数,即,质量损失率$\dot{M}=1.0 \times10^{-5} M_{\odot} \rm yr^{-1}$和风速$v_{\rm w}=1.5\times10^{3} \rm km s^{-1}$以及观测角$θ_{\rm obs} = 63.3^{\circ}$,可以得到与观测值吻合较好的多波段光变曲线。所有的观测数据都与我们的模型相一致。因此,我们得出结论,SN 2007 gr包含一个弱的相对论性喷流,我们是从离轴观测喷流。

英文摘要:

We propose an off-axis relativistic jet model for the Type Ic supernova SN 2007gr. Most of the energy ($\sim2\times10^{51}$ erg) in the explosion is contained in non-relativistic ejecta which produces the supernova. The optical emission is coming from the decay process of $\rm ^{56}Ni$ synthesized in the bulk SN ejecta. Only very little energy ($\sim10^{48}$ erg) is contained in the relativistic jet with initial velocity about 0.94 times the speed of light. The radio and X-ray emission comes from this relativistic jet. With some typical parameters of a Wolf-Rayet star (progenitor of Type Ic SN), i.e., the mass loss rate $\dot{M}=1.0 \times10^{-5} M_{\odot} \rm yr^{-1}$ and the wind velocity $v_{\rm w}=1.5\times10^{3} \rm km s^{-1}$ together with an observing angle of $θ_{\rm obs} = 63.3^{\circ}$, we can obtain the multiband light curves that fit the observations well. All the observed data are consistent with our model. Thus we conclude that SN 2007gr contains a weak relativistic jet and we are observing the jet from off-axis.

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