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arXiv 2111.07214astro-ph.IMastro-ph.EP
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通过对HST数据的宽尺度分析来表征系外行星Transit谱估计的仪器模型

Characterization of an Instrument Model for Exoplanet Transit Spectrum Estimation through Wide Scale Analysis on HST Data

Noah Huber-Feely, Mark R. Swain, Gael Roudier, Raissa Estrela

摘要:

仪器模型(IM)使过境光谱光曲线数据中的系统误差的减少,但是,由于模型的制定可以影响科学模型参数的估计,仪器模型效应的表征是至关重要的减少数据的解释。我们分析了一个简单的仪器模型,并评估其有效性和性能在哈勃WFC3和STIS仪器。在一个大的,n=63,观察到的目标样本,MCMC采样器计算每个仪器模型参数的父分布。可能的父分布函数,然后拟合和测试对经验IM分布。然后执行相关性和其他分析以找到IM关系。该模型在2种仪器和3种分析的过滤器中表现良好,此外,Student t分布与IM参数的经验母体分布非常拟合,而高斯分布对观察到的分布建模较差。该母体分布可用于MCMC先验拟合,并证明了使用该模型进行大尺度大气分析的IM一致性。最后,我们提出了一个简单的度量的基础上光曲线残差来确定模型的性能,我们证明了它的能力,以确定是否派生的光谱下,这个IM是高品质和强大的。

英文摘要:

Instrument models (IMs) enable the reduction of systematic error in transit spectroscopy light curve data, but, since the model formulation can influence the estimation of science model parameters, characterization of the instrument model effects is crucial to the interpretation of the reduced data. We analyze a simple instrument model and assess its validity and performance across Hubble WFC3 and STIS instruments. Over a large, n=63, sample of observed targets, an MCMC sampler computes the parent distribution of each instrument model parameter. Possible parent distribution functions are then fit and tested against the empirical IM distribution. Correlation and other analyses are then performed to find IM relationships. The model is shown to perform well across the 2 instruments and 3 filters analyzed and, further, the Student's t-distribution is shown to closely fit the empirical parent distribution of IM parameters and the Gaussian is shown to poorly model the observed distribution. This parent distribution can be used in the MCMC prior fitting and demonstrates IM consistency for wide scale atmospheric analysis using this model. Finally, we propose a simple metric based on light curve residuals to determine model performance, and we demonstrate its ability to determine whether a derived spectrum under this IM is high quality and robust.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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