受PDS 70c启发的系统中的三维行星周流：基于FARGO3D的流体动力学模拟与基于FARGOpy的分析
Three-dimensional circumplanetary flows in a PDS 70c-inspired system: hydrodynamic simulations with FARGO3D and analysis with FARGOpy
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中文总结 AI 辅助
本研究针对类PDS 70c系统，用FARGO3D开展三维流体动力学模拟，结合自主开发的FARGOpy分析框架，揭示了不同质量行星的行星周流结构特征，为相关研究提供基准与可复现分析框架。
中文摘要 AI 辅助
正在形成的行星PDS 70c周围行星周物质的探测，为研究巨行星形成过程中的三维气体吸积提供了宝贵的研究环境。我们采用FARGO3D开展三维流体动力学模拟，研究对象为局地等温原行星盘，采用了受该系统启发的恒星、轨道及盘参数，行星质量分别为2、4、8倍木星质量，均高于局地热质量。局地等温方案提供了可控的规定温度限制，可分离出流体的动力学结构，无需模拟自洽的热演化或辐射观测。气体通过来自盘上层的经向流和中平面附近的流进入行星环境。随着行星质量增加，流从垂直延伸的包层状构型转变为更紧凑、分层的行星周结构。推断的行星周盘（CPD）半径从R_CPD≈0.31R_Hill增至0.40R_Hill，而流仍保持亚开普勒运动，v_φ/V_K,p约为0.79至0.85。大部分封闭气体质量位于几个十分之一希尔半径范围内，而外希尔球区域则由各向异性的流入、流出及再循环主导。分析工作采用了FARGOpy，这是本研究开发的一款Python后处理框架，用于从FARGO3D输出中重建三维场、计算积分通量并表征行星周运动学。因此，本研究既为类PDS 70c环境提供了流体动力学基准，也为分析三维FARGO3D模拟提供了可复现的框架。
英文摘要
The detection of circumplanetary material around the forming planet PDS~70c provides a valuable setting for studying three-dimensional gas accretion during giant-planet formation. We present three-dimensional hydrodynamic simulations with FARGO3D for a locally isothermal protoplanetary disk, adopting system-motivated stellar, orbital, and disk parameters and planetary masses of $2$, $4$, and $8,M_{\rm Jup}$, all above the local thermal mass. The locally isothermal prescription provides a controlled prescribed-temperature limit that isolates the hydrodynamic organization of the flow, without modeling self-consistent thermal evolution or radiative observables. Gas enters the planetary environment through meridional flows from the upper disk layers and streams near the midplane. With increasing planetary mass, the flow changes from a vertically extended, envelope-like configuration to a more compact and stratified circumplanetary structure. The inferred CPD radius increases from $R_{\rm CPD}\simeq0.31$ to $0.40,R_{\rm Hill}$, while the flow remains sub-Keplerian, reaching $v_ϕ/V_{K,p}\sim0.79$--$0.85$. Most enclosed gas mass lies within a few tenths of the Hill radius, whereas the outer Hill sphere is dominated by anisotropic inflow, outflow, and recirculation. The analysis was performed with FARGOpy, a Python post-processing framework developed in this work to reconstruct three-dimensional fields, compute integrated fluxes, and characterize circumplanetary kinematics from FARGO3D outputs. This study therefore provides both a hydrodynamic baseline for a PDS~70c-like environment and a reproducible framework for analyzing three-dimensional FARGO3D simulations.
发表机构
- Universidad Técnica Federico Santa María（智利联邦圣马利亚技术大学）
- Universidad de Antioquia（安蒂奥基亚大学）
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