HARM3D+NUC: A New Method for Simulating the Post-merger Phase of Binary Neutron Star Mergers with GRMHD, Tabulated EOS, and Neutrino Leakage
HARM3D+NUC: A New Method for Simulating the Post-merger Phase of Binary Neutron Star Mergers with GRMHD, Tabulated EOS, and Neutrino Leakage
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DOI：
10.3847/1538-4357/ac1119
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发表时间：
2021-06
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影响因子：
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通讯作者：
A. Murguia-Berthier;S. Noble;L. Roberts;E. Ramirez-Ruiz;Leonardo R. Werneck;Michael Kolacki;Z. Etienne
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文献类型：
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作者：
A. Murguia-Berthier;S. Noble;L. Roberts;E. Ramirez-Ruiz;Leonardo R. Werneck;Michael Kolacki;Z. Etienne
首次双中子星并合已经在引力波中被探测到。该信号伴有一个电磁对应体，其中包括一个由放射性核衰变供能的千新星成分，以及一个短伽马射线暴。为了理解放射性供能的信号，有必要模拟并合后吸积盘的外流及其核合成。模拟吸积盘并预测外流的成分需要广义相对论磁流体动力学（GRMHD）模拟，其中要包含一个符合实际的有限温度物态方程（EOS），并且自洽地计算中微子的影响。在这项工作中，我们详细介绍了在基于HARM3D的GRMHD代码HARM3D + NUC中有限温度物态方程的实现以及中微子的处理。我们对有限温度物态方程和中微子泄漏方案都进行了形式检验。我们通过表明在与已发表的中子星并合后残余吸积盘相似的条件下，该代码能够重现自由核子重新组合成富中子成分以及热风的激发，进一步对代码进行了测试。
The first binary neutron star merger has already been detected in gravitational waves. The signal was accompanied by an electromagnetic counterpart including a kilonova component powered by the decay of radioactive nuclei, as well as a short γ-ray burst. In order to understand the radioactively powered signal, it is necessary to simulate the outflows and their nucleosynthesis from the post-merger disk. Simulating the disk and predicting the composition of the outflows requires general relativistic magnetohydrodynamical (GRMHD) simulations that include a realistic, finite-temperature equation of state (EOS) and self-consistently calculating the impact of neutrinos. In this work, we detail the implementation of a finite-temperature EOS and the treatment of neutrinos in the GRMHD code HARM3D+NUC, based on HARM3D. We include formal tests of both the finite-temperature EOS and the neutrino-leakage scheme. We further test the code by showing that, given conditions similar to those of published remnant disks following neutron star mergers, it reproduces both recombination of free nucleons to a neutron-rich composition and excitation of a thermal wind.