3D stellar evolution: hydrodynamic simulations of a complete burning phase in a massive star
3D stellar evolution: hydrodynamic simulations of a complete burning phase in a massive star
复制标题
3D 恒星演化：大质量恒星完全燃烧阶段的流体动力学模拟
DOI：
10.1093/mnras/stad1572
复制
发表时间：
2023
影响因子：
4.8
通讯作者：
Varma, V.
中科院分区：
文献类型：
--
作者：
Rizzuti, F.;Hirschi, R.;Arnett, W. D.;Georgy, C.;Meakin, C.;Murphy, A. StJ;Rauscher, T.;Varma, V.
我们关于恒星演化的知识是由一维(1D)模拟驱动的。然而，一维模型受到发生在恒星内部的许多多维现象的确切行为的不确定性的严重限制，这些现象影响着恒星的结构和演化。最近在计算资源方面的进步使人们能够用多维流体力学模型重现恒星的小部分，具有前所未有的细节和真实感。在这项工作中，我们首次使用321D制导的一维恒星模型的未改变的输入条件，对20米⊙恒星运行中的对流霓虹燃烧壳进行了一组3D模拟，从它的早期发展到完全燃料耗尽。这些模拟有助于回答恒星物理中的一些悬而未决的问题。特别是，它们表明，对流区不会因为夹带新鲜物质而无限增长，但燃料消耗超过夹带，因此当燃料耗尽时，对流也开始衰减。我们的结果表明，在恒星模型中包括对流边界混合量的问题上，多维模拟和新的321D导引的一维模型之间存在着收敛。恒星中对流带的大小对其结构和演化有很大影响，因此，对其一维模型的修正将对恒星的生命和命运产生重要的影响。因此，这将影响与核合成、超新星爆炸和致密残留物相关的理论预测。
Our knowledge of stellar evolution is driven by one-dimensional (1D) simulations. 1D models, however, are severely limited by uncertainties on the exact behaviour of many multidimensional phenomena occurring inside stars, affecting their structure and evolution. Recent advances in computing resources have allowed small sections of a star to be reproduced with multi-D hydrodynamic models, with an unprecedented degree of detail and realism. In this work, we present a set of 3D simulations of a convective neon-burning shell in a 20 M⊙star run for the first time continuously from its early development through to complete fuel exhaustion, using unaltered input conditions from a 321D-guided 1D stellar model. These simulations help answer some open questions in stellar physics. In particular, they show that convective regions do not grow indefinitely due to entrainment of fresh material, but fuel consumption prevails over entrainment, so when fuel is exhausted convection also starts decaying. Our results show convergence between the multi-D simulations and the new 321D-guided 1D model, concerning the amount of convective boundary mixing to include in stellar models. The size of the convective zones in a star strongly affects its structure and evolution; thus, revising their modelling in 1D will have important implications for the life and fate of stars. This will thus affect theoretical predictions related to nucleosynthesis, supernova explosions, and compact remnants.