Type Ic core-collapse supernova explosions evolved from very massive stars
Type Ic core-collapse supernova explosions evolved from very massive stars
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DOI：
10.1093/mnras/stt2427
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发表时间：
2013-12
影响因子：
4.8
通讯作者：
T. Yoshida;Shinpei Okita;H. Umeda
中科院分区：
文献类型：
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作者：
T. Yoshida;Shinpei Okita;H. Umeda
我们调查的可能性，一个超发光的Ic型核心坍缩超新星产生大量的56镍。主序星质量大于100 Msun且金属丰度为0.001 < Z < 0.004的超大质量恒星，预计会爆发为超亮的Ic型超新星。质量约为110 - 150 Msun且Z < 0.001的恒星，如果在脉动对不稳定性过程中失去了整个H和He层，则会爆炸为Ic型脉动对不稳定性超新星。我们评估的总喷出物的质量和产量的56镍，O和硅的核心坍缩超新星演化的非常大质量的恒星。我们采用43.1和61.1 Msun WO星Z=0.004的超新星祖先预计爆发的Ic型核心坍缩超新星。这些祖先在零年龄的主序中有110和250 Msun的质量。爆炸能量大于2 e52 erg的球形爆炸产生超过3.5 Msun 56 Ni，足以重现SN 2007 bi的光变曲线。爆炸的非球面性影响总喷出物质量以及56 Ni、O和Si的产率。110和250 Msun模型的非球形爆炸重现了SN 2007 bi的56 Ni产额。这些爆炸也将显示出大的速度分散。SN 2007 bi爆炸的可能性是一颗由超大质量星星演化而来的非球面核坍缩超新星。
We investigate the possibility of a super-luminous Type Ic core-collapse supernovae producing a large amount of 56Ni. Very massive stars with a main-sequence mass larger than 100 Msun and a metallicity 0.001 < Z < 0.004 are expected to explode as super-luminous Type Ic supernovae. Stars with ~ 110 - 150 Msun and Z < 0.001 would explode as Type Ic pulsational pair-instability supernovae if the whole H and He layers has been lost by the mass loss during pulsational pair-instability. We evaluate the total ejecta mass and the yields of 56Ni, O, and Si in core-collapse supernovae evolved from very massive stars. We adopt 43.1 and 61.1 Msun WO stars with Z=0.004 as supernova progenitors expected to explode as Type Ic core-collapse supernovae. These progenitors have masses of 110 and 250 Msun at the zero-age main sequence. Spherical explosions with an explosion energy larger than 2e52 erg produce more than 3.5 Msun 56Ni, enough to reproduce the light curve of SN 2007bi. Asphericity of the explosion affects the total ejecta mass as well as the yields of 56Ni, O, and Si. Aspherical explosions of the 110 and 250 Msun models reproduce the 56Ni yield of SN 2007bi. These explosions will also show large velocity dispersion. An aspherical core-collapse supernova evolved from a very massive star is a possibility of the explosion of SN 2007bi.