论文标题
百事可乐系外行驶运输调查（宠物）。 ii。深入搜索具有发射和传输光谱的Kelt-20 B/Mascara-2 B中的热反转剂
The PEPSI Exoplanet Transit Survey (PETS). II. A Deep Search for Thermal Inversion Agents in KELT-20 b/MASCARA-2 b with Emission and Transmission Spectroscopy
论文作者
论文摘要
最近的观察结果表明，超热木星（UHJ）的大气通常具有温度反转，其中温度随着高度的增加而增加。尽管如此，不透明度的来源负责这些反转的存在仍然很大程度上没有观察。我们使用LBT/百事可乐在传输和发射中观察UHJ KELT-20 B的大气，以寻找可能导致温度反转的分子剂。我们通过证实了先前对发射中Fe I的检测来验证我们的方法论，价格为$16.9σ$。我们搜索倒置代理TIO，VO，FEH和CAH会导致非潜在。使用注射回收测试，我们将这些成分的体积混合比上的$4σ$设置为低至$ \ sim1 \ times10^{ - 9} $的$ \ sim1 \ sim1 \ sim1 \ 9} $。对于TIO，VO和CAH，我们的限制远低于平衡化学模型的预期，而我们无法使用数据对FEH设置约束限制。因此，我们排除TIO和CAH为KELT-20 B中温度反转的来源，并且仅当线列表足够准确时才VO。
Recent observations have shown that the atmospheres of ultra hot Jupiters (UHJs) commonly possess temperature inversions, where the temperature increases with increasing altitude. Nonetheless, which opacity sources are responsible for the presence of these inversions remains largely observationally unconstrained. We used LBT/PEPSI to observe the atmosphere of the UHJ KELT-20 b in both transmission and emission in order to search for molecular agents which could be responsible for the temperature inversion. We validate our methodology by confirming previous detections of Fe I in emission at $16.9σ$. Our search for the inversion agents TiO, VO, FeH, and CaH results in non-detections. Using injection-recovery testing we set $4σ$ upper limits upon the volume mixing ratios for these constituents as low as $\sim1\times10^{-9}$ for TiO. For TiO, VO, and CaH, our limits are much lower than expectations from an equilibrium chemical model, while we cannot set constraining limits on FeH with our data. We thus rule out TiO and CaH as the source of the temperature inversion in KELT-20 b, and VO only if the line lists are sufficiently accurate.
