论文标题
确认超霍特木星黄蜂 - 121b的日期频谱中的水排放
Confirmation of water emission in the dayside spectrum of the ultrahot Jupiter WASP-121b
论文作者
论文摘要
我们提出了使用Hubble空间望远镜宽场摄像头3获得的四个新的二次日食观测值。在跨28个光谱通道跨越1.12-1.64微米波长范围内，将Eclipse深度测量到60ppm的中位数为60ppm。这是我们先前使用相同观察设置的单个日食观察获得的90ppm精度的可观改进。将这些数据与其他波长报道的数据相结合，WASP-121B的黑体光谱被排除在> 6个sigma的置信度上，我们证实了对先前检索分析的解释，这些分析发现数据可以通过几天的热反转来最好地解释数据。更新的光谱显然可以以1.3-1.6微米的形式解析水发射带，具有比以前更高的信噪比。它也未能在1.25微米的频谱中重现从第一个日食观察得出的1.25微米，该观察结果暂时归因于VO发射。我们得出结论，后者要么是统计波动，要么是第一个Eclipse数据集的系统性伪像。
We present four new secondary eclipse observations for the ultrahot Jupiter WASP-121b acquired using the Hubble Space Telescope Wide Field Camera 3. The eclipse depth is measured to a median precision of 60ppm across 28 spectroscopic channels spanning the 1.12-1.64 micron wavelength range. This is a considerable improvement to the 90ppm precision we achieved previously for a single eclipse observation using the same observing setup. Combining these data with those reported at other wavelengths, a blackbody spectrum for WASP-121b is ruled out at >6-sigma confidence and we confirm the interpretation of previous retrieval analyses that found the data is best explained by a dayside thermal inversion. The updated spectrum clearly resolves the water emission band at 1.3-1.6 micron, with higher signal-to-noise than before. It also fails to reproduce a bump in the spectrum at 1.25 micron derived from the first eclipse observation, which had tentatively been attributed to VO emission. We conclude the latter was either a statistical fluctuation or a systematic artefact specific to the first eclipse dataset.
