Adfīnitās 与 Aurōra：使用光线矢量追踪仿真多行星系统光变曲线
Adfīnitās and Aurōra: Simulating Light Curves ofMulti-Planet Systems Using Ray Vector Tracing
金洛曦 1葛健2
作者信息
- 1. 中国科学院 上海天文台，上海 200030;中国科学院大学 天文与空间科学学院，北京 100049
- 2. 中国科学院 上海天文台，上海 200030
- 折叠
摘要
该方法提出一种从动力学仿真到凌星光变曲线生成的端至端方法，融合了高精度的多体引力动力学模拟与光线矢量追踪算法，能够精确描述多行星系统中的恒星被多个天体同时遮掩时的光度变化。该方法采用速度表示的韦尔莱积分器等辛积分器保证长时间积分下哈密顿量的守恒，并通过空间几何中的光线追踪技术实现对复杂几何结构下光变曲线的模拟。该方法可以模拟真实的多体凌星现象，为缺乏观测数据的研究领域，如系外月球探索等，提供了仿真数据支持。实验结果表明，该方法在时间尺度、模拟精度与可扩展性方面具备优势，可为凌星法中非周期扰动信号的识别、TTV 和 TDV 等次级效应的模拟与算法测试提供重要工具支持。
Abstract
As the transit method becomes one of the most efffcient techniques for exoplanet detection,a key current challenge is how to model more precisely the complex orbital perturbations in multi-planetsystemsand how these perturbations manifest in light curves. This paper presents an end-to-endframework that goes from dynamical simulation to transit light-curve synthesis. It combines high-precisionN-body gravitational dynamics with a ray-tracing algorithm to accurately describe the pho-tometricvariations when multiple bodies in a multi-planet system simultaneously occult their hoststar. The method employs symplectic integrators, such as the velocity Verlet integrator, to ensureconservation of the Hamiltonian over long-term integrations, and uses geometric ray tracing to sim-ulatelight curves under complex conffgurations. It is implemented as an open-source Julia packagewith strong support for parallel and distributed computing. This method can simulate realistic multi-bodytransit phenomena and provide simulated data for under-observed regimessuch as exomoonsearches. Experiments demonstrate advantages in temporal coverage, simulation accuracy, and scal-ability,making this a valuable tool for identifying non-periodic perturbation signals in transit dataand for modeling and testing secondary effects such as TTV (Transit Timing Variations) and TDV(Transit Duration Variations).关键词
系外行星/系外月球/凌星法/数值模拟Key words
exoplanets/exomoon/transit/numerical simulation引用本文复制引用
金洛曦,葛健.Adfīnitās 与 Aurōra：使用光线矢量追踪仿真多行星系统光变曲线[EB/OL].(2026-10-10)[2026-10-14].https://chinaxiv.org/abs/202610.00040.学科分类
天文学
