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首页> 外文期刊>The Astrophysical journal >ROTATING TYPE Ⅰa SN PROGENITORS: EXPLOSION AND LIGHT CURVES
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ROTATING TYPE Ⅰa SN PROGENITORS: EXPLOSION AND LIGHT CURVES

机译：旋转Ⅰa型SN祖细胞：爆炸和光曲线

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摘要

Based on the rigidly rotating progenitor models found to be able to grow up to the canonical Chandrasekhar mass limit and beyond, and undergo a thermonuclear explosion, we compute the explosions, detailed nucleosynthesis, and corresponding light curves by means of a one-dimensional hydrodynamic code. Our results show that the inclusion of rotation in the evolution of the progenitors determines, in a natural way, a variation in the explosive physical conditions, mainly different explosive ignition densities (2.08 x 10~9 to 3.34 x 10~9 g cm~(-3)), total masses (1.39-1.48 solar mass), and binding energies (-5.3 x 10~(50) to -6.6 x 10~(50) ergs). Such a spread is related to the rotational velocity at the explosive carbon ignition stage and to the efficiency of angular momentum loss during the last part of the progenitor evolution. We explore the final outcome in the framework of the delayed detonation explosion models by fixing the value of the transition density and by considering two different braking efficiencies. Within the explored parameter space, the bolometric light curves at maximum show differences of ～0.1 mag due to the different amount of ~(56)Ni synthesized during the explosion. Although rigid rotation cannot be considered responsible for the diversities in the observational properties of SNe Ⅰa, it could explain the dispersion in the magnitude at maximum of standardized events. We also find that those models with high ignition densities produce a central remnant in which most of the neutron-rich species synthesized during the explosion are trapped.
机译：基于刚性旋转祖细胞模型，发现该模型能够长大到典型的Chandrasekhar质量极限并发生热核爆炸，我们通过一维流体动力学代码计算爆炸，详细的核合成和相应的光曲线。我们的结果表明，祖先演化过程中包括旋转，以自然方式确定了爆炸物物理条件的变化，主要是爆炸物的不同点火密度（2.08 x 10〜9至3.34 x 10〜9 g cm〜（ -3）），总质量（1.39-1.48太阳质量）和结合能（-5.3 x 10〜（50）到-6.6 x 10〜（50）ergs）。这种扩展与爆炸碳点火阶段的旋转速度以及祖细胞演化的最后阶段角动量损失的效率有关。通过固定过渡密度的值并考虑两种不同的制动效率，我们探索了延迟爆轰爆炸模型框架中的最终结果。在探索的参数空间内，由于爆炸过程中合成的〜（56）Ni量不同，最大值的辐射热曲线显示出〜0.1 mag的差异。虽然不能认为刚性旋转是造成SNeⅠa观测特性差异的原因，但它可以解释标准化事件最大值时幅度的离散。我们还发现，具有高点火密度的那些模型会产生中央残余物，其中会捕获爆炸过程中合成的大多数富中子物质。

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