论文标题

Pysme-光谱使得更容易

PySME -- Spectroscopy Made Easier

论文作者

Wehrhahn, Ansgar, Piskunov, Nikolai, Ryabchikova, Tanja

论文摘要

系外行星的表征需要可靠地确定其宿主星的基本参数。光谱拟合在此过程中起着重要作用。对于大多数恒星参数,将合成光谱与观测值匹配的恒星参数为基本参数(例如有效温度,表面重力,丰度,径向和旋转速度等)提供了强大而独特的解决方案。在这里,我们提供了一个新的软件包,用于适合易于使用的高分辨率出色光谱,可用于通用平台,并且没有商业许可。我们称之为Pysme。它基于使其简单的经过验证的光谱(后来称为IDL SME或“原始SME”)软件包。原始中小企业代码的IDL部分已在Python中重写,但我们保留了负责分子离子化平衡,不透明和光谱合成的有效C ++和Fortran代码。在此过程中,我们更新了优化过程的一些组件,从而提供了更大的灵活性和更好的收敛分析。结果是一个更现代的软件包,具有原始中小型企业的功能相同。我们将Pysme应用于不同光谱类型的几颗恒星,并将派生的基本参数与IDL SME和其他技术的结果进行了比较。我们表明,Pysme至少与原始中小型企业一样工作。

The characterization of exoplanet requires reliable determination of the fundamental parameters of their host stars. Spectral fitting plays an important role in this process. For the majority of stellar parameters matching synthetic spectra to the observations provides a robust and unique solution for fundamental parameters, such as effective temperature, surface gravity, abundances, radial and rotational velocities and others. Here we present a new software package for fitting high resolution stellar spectra that is easy to use, available for common platforms and free from commercial licenses. We call it PySME. It is based on the proven Spectroscopy Made Easy (later referred to as IDL SME or "original SME") package. The IDL part of the original SME code has been rewritten in Python, but we kept the efficient C++ and FORTRAN code responsible for molecular-ionization equilibrium, opacities and spectral synthesis. In the process we have updated some components of the optimization procedure offering more flexibility and better analysis of the convergence. The result is a more modern package with the same functionality of the original SME. We apply PySME to a few stars of different spectral types and compared the derived fundamental parameters with the results from IDL SME and other techniques. We show that PySME works at least as well as the original SME.

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