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Moving-mesh radiation-hydrodynamic simulations of wind-reprocessed transients
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2021-07-30 , DOI: 10.1093/mnras/stab2219
Diego Calderón 1 , Ondřej Pejcha 1 , Paul C Duffell 2
Affiliation  

Motivated by recent theoretical work on tidal disruption events and other peculiar transients, we present moving-mesh radiation-hydrodynamic simulations of radiative luminosity emitted by a central source being reprocessed by a wind-like outflow. We couple the moving-mesh hydrodynamic code jet with our newly developed radiation module based on mixed-frame grey flux-limited diffusion with implicit timestep update. This allows us to study the self-consistent multidimensional radiation-hydrodynamic evolution over more than 10 orders of magnitude in both space and time in a single run. We simulate an optically thick spherical wind with constant or evolving mass-loss rate, which is irradiated by a central isotropic or angularly dependent radiation source. Our spherically symmetric simulations confirm previous analytic results by identifying different stages of radiation reprocessing: radiation trapped in the wind, diffusing out through the wind, and reaching constant maximum attenuation. We find that confining the central radiation source in a cone with moderate opening angles decrease up to one order of magnitude the early flux along sightlines oriented away from the direction of radiation injection but that the reprocessed radiation becomes isotropic roughly after one lateral diffusion time through the ejecta. We discuss further applications and guidelines for the use of our novel radiation-hydrodynamics tool in the context of transient modelling.

中文翻译:

风再处理瞬态的移动网格辐射流体动力学模拟

受最近关于潮汐破坏事件和其他特殊瞬变的理论工作的启发,我们提出了由风状流出物重新处理的中心源发出的辐射光度的移动网格辐射流体动力学模拟。我们将移动网格流体动力学代码射流与我们新开发的基于混合帧灰色通量限制扩散的辐射模块与隐式时间步长更新相结合。这使我们能够在单次运行中研究空间和时间超过 10 个数量级的自洽多维辐射流体动力学演化。我们模拟具有恒定或不断变化的质量损失率的光学厚球形风,其由中心各向同性或角度相关的辐射源照射。我们的球对称模拟通过识别辐射再处理的不同阶段来确认先前的分析结果:辐射被困在风中,通过风扩散,并达到恒定的最大衰减。我们发现,将中心辐射源限制在一个具有中等张角的锥体中,沿远离辐射注入方向的视线方向的早期通量减少了一个数量级,但经过再处理的辐射大致在一个横向扩散时间后变成各向同性的。喷射物。我们讨论了在瞬态建模背景下使用我们的新型辐射流体动力学工具的进一步应用和指南。我们发现,将中心辐射源限制在一个具有中等张角的锥体中,沿远离辐射注入方向的视线方向的早期通量减少了一个数量级,但经过再处理的辐射大致在一个横向扩散时间后变成各向同性的。喷射物。我们讨论了在瞬态建模背景下使用我们的新型辐射流体动力学工具的进一步应用和指南。我们发现,将中心辐射源限制在一个具有中等张角的锥体中,沿远离辐射注入方向的视线方向的早期通量减少了一个数量级,但经过再处理的辐射大致在一个横向扩散时间后变成各向同性的。喷射物。我们讨论了在瞬态建模背景下使用我们的新型辐射流体动力学工具的进一步应用和指南。
更新日期:2021-07-30
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