An Asymmetric Energetic Type Ic Supernova Viewed Off-Axis, and a Link to Gamma Ray Bursts
An Asymmetric Energetic Type Ic Supernova Viewed Off-Axis, and a Link to Gamma Ray Bursts
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DOI：
10.1126/science.1111384
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发表时间：
2005-05
期刊：
影响因子：
56.9
通讯作者：
P. Mazzali;K. Kawabata;K. Maeda;K. Nomoto;A. Filippenko;E. Ramirez-Ruiz;S. Benetti;E. Pian
中科院分区：
文献类型：
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作者：
P. Mazzali;K. Kawabata;K. Maeda;K. Nomoto;A. Filippenko;E. Ramirez-Ruiz;S. Benetti;E. Pian
IC型超新星是大质量恒星核心坍塌后发生的爆炸，此前这些恒星失去了氢和氦包层，由于它们与长时间的伽马射线爆发有关，因此特别有趣。尽管有迹象表明这些爆炸是非球面的，但直接证据一直没有。超新星SN2003jd是一颗发光的I型超新星，其后期观测提供了这样的证据。最近的斯巴鲁和凯克光谱揭示了中性氧和镁星云的双峰轮廓。这些轮廓不同于已知类型的IC型超新星，无论有没有伽马射线暴，它们都可以理解为SN2003jd是否是从赤道面附近观察到的非球面轴对称爆炸。如果SN2003jd与伽马射线暴有关，我们错过了那次爆发，因为它指向远离我们。
Type Ic supernovae, the explosions after the core collapse of massive stars that have previously lost their hydrogen and helium envelopes, are particularly interesting because of their link with long-duration gamma ray bursts. Although indications exist that these explosions are aspherical, direct evidence has been missing. Late-time observations of supernova SN 2003jd, a luminous type Ic supernova, provide such evidence. Recent Subaru and Keck spectra reveal double-peaked profiles in the nebular lines of neutral oxygen and magnesium. These profiles are different from those of known type Ic supernovae, with or without a gamma ray burst, and they can be understood if SN 2003jd was an aspherical axisymmetric explosion viewed from near the equatorial plane. If SN 2003jd was associated with a gamma ray burst, we missed the burst because it was pointing away from us.