用遗传算法模拟原行星盘
The use of genetic algorithm to model protoplanetary discs
摘要：
用几何盘模型拟合Tauri T星和Herbig Ae/Be星的光谱能量分布（SED），研究了它们的原行星盘。这些模拟提供了再现不同星周结构特征的手段，这些结构与不同水平的红外过量有关。为了改进我们以前的模型，假设一个简单的平盘配置，在目前的工作中，我们采用了后处理扩口盘模型，考虑流体静力学，辐射平衡（Dullemond等。2001）。提出了一种基于遗传算法的参数估计优化方法。本文致力于描述新代码的实施，它已被应用于Herbig星从Pico dos Dias调查目录，以说明各种SED形状的拟合质量。星AB Aur被用来作为GA参数估计的测试，表明新的代码成功地再现了一个典型的例子，耀斑盘模型。GA方法给出了良好的拟合质量，但输入参数的范围必须谨慎选择，因为可能会得出不切实际的圆盘参数。的喇叭形光盘模型被证实，以适应典型的赫比格星扁平的SED，但嵌入的对象（增加SED斜率）和碎片光盘（陡峭的SED）不适合这种配置。即使考虑到导出的参数的限制，SED拟合的自动过程提供了一个有趣的工具，大样本的年轻恒星的星周光度的统计分析。
英文摘要：
The protoplanetary discs of T Tauri and Herbig Ae/Be stars have been studied by using geometric disc models to fit their spectral energy distribution (SED). The simulations provide means to reproduce the signatures of different circumstellar structures, which are related to different levels of infrared excess. Aiming to improve our previous model that assumed a simple flat disc configuration, in the present work we adopt a reprocessing flared disc model that considers hydrostatic, radiative equilibrium (Dullemond et al. 2001). We developed a method to optimise the parameters estimation based on genetic algorithms (GA). This paper is dedicated to describe the implementation of the new code, which has been applied for Herbig stars from the Pico dos Dias Survey catalogue, in order to illustrate the quality of the fitting for a variety of SED shapes. The star AB Aur was used as a test of the GA parameters estimation, demonstrating that the new code reproduces successfully a canonical example of the flared disc model. The GA method gives good quality of fittings, but the range of input parameters must be chosen with caution, since unrealistic disc parameters can be derived. The flared disc model is confirmed to fit the flattened SEDs typical from Herbig stars, however the embedded objects (increasing SED slope) and debris discs (steeper SED) are not well fitted with this configuration. Even considering the limitation of the derived parameters, the automatic process of SED fitting provides an interesting tool for the statistical analysis of the circumstellar luminosity of large samples of young stars.
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