Modules for Experiments in Stellar Astrophysics (MESA): Time-dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure-猫眼课题宝

DOI：

10.3847/1538-4365/acae8d

发表时间：

2022-08

期刊：

The Astrophysical Journal Supplement Series

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

A. Jermyn;E. Bauer;J. Schwab;R. Farmer;W. Ball;E. Bellinger;A. Dotter;M. Joyce;P. Marchant;J. Mombarg;W. M. Wolf;Tin Long Sunny Wong;G. Cinquegrana;E. Farrell;R. Smolec;A. Thoul;M. Cantiello;F. Herwig;O. Toloza;L. Bildsten;R. Townsend;F. Timmes

我们更新了开放知识软件仪器恒星天体物理实验模块（MESA）的功能。新的 auto_diff 模块在 MESA 中实现自动微分，这是一种减少对硬编码分析表达式或有限差分近似的需要的功能。我们通过一种新的时间相关对流模型显着增强了对 MESA 中对流生长和衰减的处理，这在大质量恒星的后期核燃烧和电子简并点火事件中尤为重要。我们加强了 MESA 对状态方程的实施，并通过讨论不同的能量方程功能和增强功能来量化能量核算和求解器精度的持续改进。为了改进 MESA 中的恒星建模，我们描述了对恒星大气、分子不透明性、康普顿不透明性、传导性不透明性、元素扩散系数和核反应速率处理的关键更新。我们介绍了星黑子的处理方法，这是低质量恒星的一个重要考虑因素，以及辐射主导区域中超绝热对流的修改。我们描述了提高单色不透明度和辐射悬浮计算效率的新方法，以及通过新的算子分裂核燃烧模式提高大质量恒星后期演化效率的新方法。最后，我们讨论了 MESA 软件基础设施的重大更新，以增强源代码开发和社区参与。

We update the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics (MESA). The new auto_diff module implements automatic differentiation in MESA, an enabling capability that alleviates the need for hard-coded analytic expressions or finite-difference approximations. We significantly enhance the treatment of the growth and decay of convection in MESA with a new model for time-dependent convection, which is particularly important during late-stage nuclear burning in massive stars and electron-degenerate ignition events. We strengthen MESA’s implementation of the equation of state, and we quantify continued improvements to energy accounting and solver accuracy through a discussion of different energy equation features and enhancements. To improve the modeling of stars in MESA, we describe key updates to the treatment of stellar atmospheres, molecular opacities, Compton opacities, conductive opacities, element diffusion coefficients, and nuclear reaction rates. We introduce treatments of starspots, an important consideration for low-mass stars, and modifications for superadiabatic convection in radiation-dominated regions. We describe new approaches for increasing the efficiency of calculating monochromatic opacities and radiative levitation, and for increasing the efficiency of evolving the late stages of massive stars with a new operator-split nuclear burning mode. We close by discussing major updates to MESA’s software infrastructure that enhance source code development and community engagement.

Modules for Experiments in Stellar Astrophysics (MESA): Time-dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure

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