CONVECTIVE PROPERTIES OF ROTATING TWO-DIMENSIONAL CORE-COLLAPSE SUPERNOVA PROGENITORS
CONVECTIVE PROPERTIES OF ROTATING TWO-DIMENSIONAL CORE-COLLAPSE SUPERNOVA PROGENITORS
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旋转二维核心塌陷超新星前体的对流特性
DOI：
10.3847/0004-637x/822/2/61
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
F. Timmes
中科院分区：
文献类型：
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作者：
E. Chatzopoulos;S. Couch;W. Arnett;W. Arnett;F. Timmes
我们探索了在20 M⊙恒星演化后期，旋转对对流碳、氧和硅壳燃烧的影响。利用恒星天体物理学实验模块，我们构建了无旋转和初始刚性旋转为临界50%的一维（1D）恒星模型。在演化过程的不同阶段，我们将一维模型映射为二维模型，并使用FLASH可压缩流体力学代码跟踪多次对流周转的多维演化，直到达到准稳态。我们通过将动量密度分解为矢量球谐波来表征对流运动的强度和尺度。我们发现旋转影响了电磁模式下的总功率，其中碳氧壳燃烧的影响略大于硅壳燃烧的影响。在一维恒星演化模型中加入旋转会改变恒星的结构，从而对多维对流的特征产生重大影响。然而，在演化阶段忽略自转的恒星模型中加入适量的自转，对产生的对流的特性影响不大。由于在核心坍缩点存在的对流的空间尺度和强度直接影响超新星的机制，我们的研究结果表明，旋转可能在为大质量恒星爆炸奠定基础方面发挥重要作用。
We explore the effects of rotation on convective carbon, oxygen, and silicon shell burning during the late stages of evolution in a 20 M⊙ star. Using the Modules for Experiments in Stellar Astrophysics we construct one-dimensional (1D) stellar models both with no rotation and with an initial rigid rotation of 50% of critical. At different points during the evolution, we map the 1D models into 2D and follow the multidimensional evolution using the FLASH compressible hydrodynamics code for many convective turnover times until a quasi-steady state is reached. We characterize the strength and scale of convective motions via decomposition of the momentum density into vector spherical harmonics. We find that rotation influences the total power in solenoidal modes, with a slightly larger impact for carbon and oxygen shell burning than for silicon shell burning. Including rotation in 1D stellar evolution models alters the structure of the star in a manner that has a significant impact on the character of multidimensional convection. Adding modest amounts of rotation to a stellar model that ignores rotation during the evolutionary stage, however, has little impact on the character of the resulting convection. Since the spatial scale and strength of convection present at the point of core collapse directly influence the supernova mechanism, our results suggest that rotation could play an important role in setting the stage for massive stellar explosions.