Asphericity in Supernova Explosions from Late-Time Spectroscopy
Asphericity in Supernova Explosions from Late-Time Spectroscopy
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DOI：
10.1126/science.1149437
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发表时间：
2008-01
期刊：
影响因子：
56.9
通讯作者：
K. Maeda;K. Kawabata;P. Mazzali;Masaomi Tanaka;S. Valenti;K. Nomoto;T. Hattori;J. Deng;E. Pian;S. Taubenberger;M. Iye;T. Matheson;A. Filippenko;K. Aoki;G. Kosugi;Y. Ohyama;T. Sasaki;T. Takata
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文献类型：
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作者：
K. Maeda;K. Kawabata;P. Mazzali;Masaomi Tanaka;S. Valenti;K. Nomoto;T. Hattori;J. Deng;E. Pian;S. Taubenberger;M. Iye;T. Matheson;A. Filippenko;K. Aoki;G. Kosugi;Y. Ohyama;T. Sasaki;T. Takata
核心坍缩超新星（CC-SNe）是宣告大质量恒星死亡的爆炸。一些CC-SNe与长时间伽玛射线暴（grb）有关，并且是非球面的。一个重要的问题是，所有CC-SNe的非球面性在多大程度上是共同的。在这里，我们给出了一些来自剥离包膜恒星的CC-SNe的晚时间光谱，并用它们来探索爆炸恒星内部产生的任何非球面，靠近坍缩的位置。观测到一系列的氧发射谱线，包括高发生率的双峰谱线，这是非球面爆炸的明显特征。我们的结果表明，所有来自剥离包层恒星的CC-SNe都是非球面爆炸，而伴随着grb的SNe表现出最高的非球面程度。
Core-collapse supernovae (CC-SNe) are the explosions that announce the death of massive stars. Some CC-SNe are linked to long-duration gamma-ray bursts (GRBs) and are highly aspherical. One important question is to what extent asphericity is common to all CC-SNe. Here we present late-time spectra for a number of CC-SNe from stripped-envelope stars and use them to explore any asphericity generated in the inner part of the exploding star, near the site of collapse. A range of oxygen emission-line profiles is observed, including a high incidence of double-peaked profiles, a distinct signature of an aspherical explosion. Our results suggest that all CC-SNe from stripped-envelope stars are aspherical explosions and that SNe accompanied by GRBs exhibit the highest degree of asphericity.