对NICMOS透射光谱的新看法：分子特征没有决定性证据
A new look at NICMOS transmission spectroscopy: no conclusive evidence for molecular features
摘要：
我们提出了一个重新分析档案HST/NICMOS传输光谱的系外行星系统，HD 189733，从几个分子的检测已被要求。正如预期的那样，我们可以复制以前公布的透射谱时，我们使用一个相同的模型的系统效应，虽然不确定性较大，因为我们使用的残差置换算法，努力占仪器系统学。我们还发现，透射光谱是相当大的改变时，稍微改变仪器模型，并得出结论，NICMOS透射光谱是太依赖于用于删除系统被认为是一个强大的检测分子物种的方法，因为没有物理上的理由相信，基线通量应建模为任何选择的一组参数的线性函数。
英文摘要：
We present a re-analysis of archival HST/NICMOS transmission spectroscopy of the exoplanet system, HD 189733, from which detections of several molecules have been claimed. As expected, we can replicate the transmission spectrum previously published when we use an identical model for the systematic effects, although the uncertainties are larger as we use a residual permutation algorithm in an effort to account for instrumental systematics. We also find that the transmission spectrum is considerably altered when slightly changing the instrument model, and conclude that the NICMOS transmission spectrum is too dependent on the method used to remove systematics to be considered a robust detection of molecular species, given that there is no physical reason to believe that the baseline flux should be modelled as a linear function of any chosen set of parameters.
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