ExoTiC-ISM：一个Python包，用于系统仪器模型网格中的边缘化系外行星transit参数
ExoTiC-ISM: A Python package for marginalised exoplanet transit parameters across a grid of systematic instrument models
摘要：
针对渡越光变曲线测量中仪器系统的标定问题，提出了基于Python的ExoTiC-ISM软件包。凌日光谱可以揭示系外行星大气中许多不同的化学成分，但这些结果取决于校准良好的凌日光变曲线观测。每个凌日数据集将包含取决于所用仪器的仪器系统，需要用仪器系统模型进行校准。Wakeford等人（2016）（arXiv：1601.02587 [astro-ph.EP]）提出的解决方案是在系统模型网格中使用边缘化，以检索边缘化的过境参数。在多个波长的观测中这样做会产生一个系外行星的鲁棒透射光谱。ExoTiC-ISM提供了进行这种分析的工具，其目前的能力包括一个系统网格，适用于哈勃太空望远镜（HST）上的宽视场相机3（WFC 3）探测器，特别是两个红外光栅G141和G102。通过代码的模块化和更系统网格的实现，ExoTiC-ISM可以用于其他仪器，并且在詹姆斯韦伯太空望远镜（JWST）上选择探测器的实现将在未来提供强大的凌日光谱。
英文摘要：
To address the the problem of calibration of instrument systematics in transit light curves, we present the Python package ExoTiC-ISM. Transit spectroscopy can reveal many different chemical components in exoplanet atmospheres, but such results depend on well-calibrated transit light curve observations. Each transit data set will contain instrument systematics that depend on the instrument used and will need to be calibrated out with an instrument systematic model. The proposed solution in Wakeford et al. (2016) (arXiv:1601.02587 [astro-ph.EP]) is to use a marginalisation across a grid of systematic models in order to retrieve marginalised transit parameters. Doing this over observations in multiple wavelengths yields a robust transmission spectrum of an exoplanet. ExoTiC-ISM provides tools to perform this analysis, and its current capability contains a systematic grid that is applicable to the Wide Field Camera 3 (WFC3) detector on the Hubble Space Telescope (HST), particularly for the two infrared grisms G141 and G102. By modularisation of the code and implementation of more systematic grids, ExoTiC-ISM can be used for other instruments, and an implementation for select detectors on the James Webb Space Telescope (JWST) will provide robust transit spectra in the future.
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