论文标题
精确的近红外光度法，在南方天文台占据可降水的水蒸气
Precise near-infrared photometry, accounting for precipitable water vapour at SPECULOOS Southern Observatory
论文作者
论文摘要
沉淀水蒸气（PWV）引起的变异性会严重影响从地面收集的时间序列测量值的准确性，尤其是在近红外。我们在这里提出了一种新颖的方法，用于建模和缓解这种变异性，以及开发开发的工具-Umbrella。在这项研究中，我们评估了三个公共带通（R'，i'，Z'）和Speculoos'主带通（I+Z'）中的光度法在pWV变异性上受到光度影响的程度。在选择带通道的选择中，发现I+Z'带通对PWV变异性最敏感，其次是Z'，i'和r'。使用来自LHATPRO和局部温度/湿度传感器的PWV测量值，通过Speculoos的南部观测站（SSO）和I+Z'带通与I+Z'带通的全球光曲线进行了校正。观察到的可变性的中位数降低比SSO目标的预期过境持续时间短。在时间尺度的时间长于可能引起长期可变性的预期过境持续时间的时间长，对于相同的校正方法，观察到RMS的中位数降低为53.8％。
The variability induced by precipitable water vapour (PWV) can heavily affect the accuracy of time-series photometric measurements gathered from the ground, especially in the near-infrared. We present here a novel method of modelling and mitigating this variability, as well as open-sourcing the developed tool -- Umbrella. In this study, we evaluate the extent to which the photometry in three common bandpasses (r', i', z'), and SPECULOOS' primary bandpass (I+z'), are photometrically affected by PWV variability. In this selection of bandpasses, the I+z' bandpass was found to be most sensitive to PWV variability, followed by z', i', and r'. The correction was evaluated on global light curves of nearby late M- and L-type stars observed by SPECULOOS' Southern Observatory (SSO) with the I+z' bandpass, using PWV measurements from the LHATPRO and local temperature/humidity sensors. A median reduction in RMS of 1.1% was observed for variability shorter than the expected transit duration for SSO's targets. On timescales longer than the expected transit duration, where long-term variability may be induced, a median reduction in RMS of 53.8% was observed for the same method of correction.
