Model light curves of linear Type II supernovae
Model light curves of linear Type II supernovae
复制标题
线性 II 型超新星的模型光变曲线
DOI：
10.1086/170115
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
R. Harkness
中科院分区：
文献类型：
--
作者：
D. Swartz;J. Wheeler;R. Harkness
从流体动力学模型计算的超新星的光变曲线与线性II型超新星的平均观测到的B和V波段光变曲线进行了比较。模型是基于以下爆炸场景：碳爆燃内的C + O核心附近的卡拉塞卡质量，电子捕获引起的核心崩溃的O-Ne-Mg核心的卡拉塞卡质量，和崩溃的Fe核心在一个巨大的星星。一个范围内的包络质量，初始半径，和组成进行了研究。这些参数的值只有很窄的范围与观测结果一致。在这个狭窄的范围内，大多数观测到的光变曲线特性可以部分获得，但没有一个模型可以在整个200天的比较期间再现整个光变曲线形状和绝对星等。所观察到的缺乏一个平台阶段的解释相结合的小信封质量和信封氦增强。只有当爆炸合成的放射性Ni-56的质量很小时，才能再现光变曲线的最终钴尾相。这里给出的结果，结合超新星子类中单个成员之间观察到的均匀性，支持O-Ne-Mg核心坍缩机制作为线性II型超新星的一种更好的解释。蟹状星云可能就是从这样的爆炸中产生的。碳爆燃可能会导致像SN 1979 C这样更明亮的事件。参考文献62篇。«少
Light curves computed from hydrodynamic models of supernova are compared graphically with the average observed B and V-band light curves of linear Type II supernovae. Models are based on the following explosion scenarios: carbon deflagration within a C + O core near the Chandrasekhar mass, electron-capture-induced core collapse of an O-Ne-Mg core of the Chandrasekhar mass, and collapse of an Fe core in a massive star. A range of envelope mass, initial radius, and composition is investigated. Only a narrow range of values of these parameters are consistent with observations. Within this narrow range, most of the observed light curve properties can be obtained in part, but none of the models can reproduce the entire light curve shape and absolute magnitude over the full 200 day comparison period. The observed lack of a plateau phase is explained in terms of a combination of small envelope mass and envelope helium enhancement. The final cobalt tail phase of the light curve can be reproduced only if the mass of explosively synthesized radioactive Ni-56 is small. The results presented here, in conjunction with the observed homogeneity among individual members of the supernova subclass, argue favorably for the O-Ne-Mg core collapse mechanism as anmore » explanation for linear Type II supernovae. The Crab Nebula may arisen from such an explosion. Carbon deflagrations may lead to brighter events like SN 1979C. 62 refs.« less