Realistic 3D hydrodynamics simulations find significant turbulent entrainment in massive stars
Realistic 3D hydrodynamics simulations find significant turbulent entrainment in massive stars
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真实的 3D 流体动力学模拟发现大质量恒星中存在显着的湍流夹带
DOI：
10.1093/mnras/stac1981
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发表时间：
2022
影响因子：
4.8
通讯作者：
Rizzuti F
中科院分区：
文献类型：
--
作者：
Rizzuti F
我们对恒星结构和演化的理解来自一维（1D）恒星模型是有限的，与恒星内部发生的多维过程的不确定性。然而，现在可以借助详细的三维（3D）流体动力学模型来测试和改进1D模型，由于计算资源的最新进展，该模型可以在短时间尺度内再现复杂的多维过程。在这些过程中，湍流卷吸导致对流边界混合是最不了解和最有影响力的过程之一。在这里，我们提出了一套流体动力学模拟的结果，在一个大质量的星星的燃烧壳，并解释他们的湍流卷吸法的框架内从天体物理学。我们的模拟不同于以往的研究，在再现恒星环境的前所未有的现实主义程度。重要的是，在模拟中发现的强夹带突出了目前在一维恒星模型中实施对流边界混合的主要缺陷。因此，这项研究要求对如何在1D中模拟对流边界进行重大修订，特别是在这些模型中实现夹带。这将对超新星理论、核合成、中子星和黑洞物理学产生重要影响。
Our understanding of stellar structure and evolution coming from one-dimensional (1D) stellar models is limited by uncertainties related to multidimensional processes taking place in stellar interiors. 1D models, however, can now be tested and improved with the help of detailed three-dimensional (3D) hydrodynamics models, which can reproduce complex multidimensional processes over short time-scales, thanks to the recent advances in computing resources. Among these processes, turbulent entrainment leading to mixing across convective boundaries is one of the least understood and most impactful. Here, we present the results from a set of hydrodynamics simulations of the neon-burning shell in a massive star, and interpret them in the framework of the turbulent entrainment law from geophysics. Our simulations differ from previous studies in their unprecedented degree of realism in reproducing the stellar environment. Importantly, the strong entrainment found in the simulations highlights the major flaws of the current implementation of convective boundary mixing in 1D stellar models. This study therefore calls for major revisions of how convective boundaries are modelled in 1D, and in particular the implementation of entrainment in these models. This will have important implications for supernova theory, nucleosynthesis, neutron stars, and black holes physics.