Active Carbon and Oxygen Shell Burning Hydrodynamics
Active Carbon and Oxygen Shell Burning Hydrodynamics
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DOI：
10.1086/500544
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发表时间：
2006-01
期刊：
影响因子：
--
通讯作者：
C. Meakin;D. Arnett
中科院分区：
文献类型：
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作者：
C. Meakin;D. Arnett
我们用完全流体动力学行为模拟了一颗23 M星星晚期演化的2.5 × 103 s。我们提出了第一个模拟的多壳燃烧时代，包括并发的演变和相互作用的氧和碳燃烧壳。此外，我们已经发展了一个三维模型的氧气燃烧壳足够长的时间（300秒）开始，以评估适当的二维近似。我们总结了引人注目的新结果：（1）强相互作用发生在活性碳和氧燃烧壳层之间;（2）在对流-辐射边界处产生的非对流区域的流体动力学波动在二维和三维中都具有重要的能量意义，对成分混合具有重要影响;以及（3）在这些计算域中，混合的p-和g-模式的谱与相应的绝热波明确地识别。我们发现，二维对流运动被夸大相对于三维的，因为在三维涡不稳定。我们讨论了在核心坍缩中超新星祖先演化和对称性破缺的影响。
We have simulated 2.5 × 103 s of the late evolution of a 23 M☉ star with full hydrodynamic behavior. We present the first simulations of a multiple-shell burning epoch, including the concurrent evolution and interaction of an oxygen- and a carbon-burning shell. In addition, we have evolved a three-dimensional model of the oxygen-burning shell to sufficiently long times (300 s) to begin to assess the adequacy of the two-dimensional approximation. We summarize striking new results: (1) strong interactions occur between active carbon- and oxygen-burning shells; (2) hydrodynamic wave motions in nonconvective regions, generated at the convective-radiative boundaries, are energetically important in both two and three dimensions, with important consequences for compositional mixing; and (3) a spectrum of mixed p- and g-modes are unambiguously identified with corresponding adiabatic waves in these computational domains. We find that two-dimensional convective motions are exaggerated relative to three-dimensional ones because of vortex instability in three dimensions. We discuss the implications for supernova progenitor evolution and symmetry breaking in core collapse.