发表机构
Princeton University; University of California, Berkeley; University of Idaho（普林斯顿大学; 加州大学伯克利分校; 爱达荷大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究9-$M_{\odot}$低质量前身星超新星爆炸模拟中，各种可观测量对旋转速率的依赖性，发现旋转对超新星动力学各方面影响不大，仅最快旋转模型反冲踢和自旋明显对齐，核合成产率对旋转速率依赖性小，初始到最终核心自旋周期比率约4000。
AI 中文摘要
我们研究了对于一个9-$M_{\odot}$前身星爆炸模拟至饱和时，各种超新星可观测量对旋转速率的单独依赖性。发现爆炸能量在广泛的初始自旋范围内与自旋呈非单调关系且弱依赖于自旋。爆炸的不对称性对自旋的依赖性较弱，更快的自旋仅导致稍大一点的不对称性。爆炸期间极赤道中微子加热不对称性不显著，即使快速旋转时也只有最快旋转体中微子加热率明显降低。因此，仅旋转对超新星动力学所有显著方面的影响不大。我们发现只有在最快旋转模型中反冲踢和自旋才明显对齐。有趣的是，对于最快旋转体，在0.05附近出现了$T/|W|$共转不稳定性并出现螺旋臂模式。我们发现核合成产率对旋转速率的依赖性很小，并确定初始到最终核心自旋周期的比率接近~4000，这意味着鉴于推断出的新生射电脉冲星周期适中，大多数超新星核心的初始自旋周期可能相当长。然而，我们仅关注一个前身星且未包括磁场。尽管如此，至少对于早期爆炸的低质量前身星，我们发现在广泛的初始自旋范围内，旋转在大多数主要细节方面的影响不明显。
英文摘要
We explore the dependence upon rotation rate alone of various supernova observables simulated to their saturation for the explosion of a 9-$M_{\odot}$ progenitor. We find that the explosion energy is non-monotonic with, and weakly dependent upon, spin across a broad range of initial spins. The asymmetries of the blast depend weakly on spin, with faster spins leading to only slightly greater asymmetries. There is little significant pole-equator neutrino heating asymmetry during explosion, even for rapid rotation, and only for the fastest rotator does the neutrino heating rate diminish noticeably. Hence, the effects of rotation alone on all salient aspects of supernova dynamics are not large. We find that the recoil kick and spin are clearly aligned only for the most rapidly rotating model. Interestingly, for the fastest rotator, we witness a $T/|W|$ corotation instabilities near a value of 0.05 and spiral arm modes emerge. We find that the nucleosynthetic yields depend little upon the rotation rate and determine that the ratio of initial to final core spin period is near $\sim$4000, implying, given the modest inferred radio pulsar periods at birth, that the initial spin periods of most supernova cores are likely quite long. However, we focus on only one progenitor and do not include magnetic fields. Nevertheless, at least for low-mass progenitors which explode early, we find muted consequences of rotation in most major particulars across a wide range of initial spins.
CommentsAccepted to Ap.J
