用神经网络快速准确预测系外行星大气质量损失,精度远超传统方法。
Grid-based exoplanet atmospheric mass loss predictions through neural network
- 基于1.1万组模型训练,用密集神经网络构建插值框架MLink
- 相比传统方法,大幅降低大误差点数量与最大误差值
- 适合研究行星演化、尤其半径间隙附近敏感问题的学者
快速准确估算行星质量损失率对行星种群与演化建模至关重要。本文利用机器学习(ML)对已有约11000组流体动力学高层大气模型网格进行快速插值,可在网格范围内为任意行星提供高精度的质量损失率。额外构建约250组模型用于测试。开发的神经网络插值方案(称为MLink)相较线性插值与径向基函数回归等经典方法,在整个参数空间内显著减少大误差点数量和最大误差。多数情况下,使用MLink与经典方法计算的演化轨迹在吉年尺度下结果相近;但对于靠近半径间隙顶部的行星,两者预测的半径差异可超过典型观测不确定性。机器学习可有效从模型网格中估计大气质量损失率,为未来更大更复杂的多物理过程模型探索奠定基础。
原文摘要 · Abstract (English)
The fast and accurate estimation of planetary mass-loss rates is critical for planet population and evolution modelling. We use machine learning (ML) for fast interpolation across an existing large grid of hydrodynamic upper atmosphere models, providing mass-loss rates for any planet inside the grid boundaries with superior accuracy compared to previously published interpolation schemes. We consider an already available grid comprising about 11000 hydrodynamic upper atmosphere models for training and generate an additional grid of about 250 models for testing purposes. We develop the ML interpolation scheme (dubbed "atmospheric Mass Loss INquiry frameworK"; MLink) using a Dense Neural Network, further comparing the results with what was obtained employing classical approaches (e.g. linear interpolation and radial basis function-based regression). Finally, we study the impact of the different interpolation schemes on the evolution of a small sample of carefully selected synthetic planets. MLink provides high-quality interpolation across the entire parameter space by significantly reducing both the number of points with large interpolation errors and the maximum interpolation error compared to previously available schemes. For most cases, evolutionary tracks computed employing MLink and classical schemes lead to comparable planetary parameters at Gyr-timescales. However, particularly for planets close to the top edge of the radius gap, the difference between the predicted planetary radii at a given age of tracks obtained employing MLink and classical interpolation schemes can exceed the typical observational uncertainties. Machine learning can be successfully used to estimate atmospheric mass-loss rates from model grids paving the way to explore future larger and more complex grids of models computed accounting for more physical processes.
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