arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2005.09631astro-ph.EP
收藏

超热木星WASP-121 b昼侧光谱中水排放的确认

Confirmation of water emission in the dayside spectrum of the ultrahot Jupiter WASP-121b

Thomas Mikal-Evans, David K. Sing, Tiffany Kataria, Hannah R. Wakeford, Nathan J. Mayne, Nikole K. Lewis, Joanna K. Barstow, Jessica J. Spake

摘要:

我们提出了四个新的二次日食观测超热木星WASP-121 b获得使用哈勃太空望远镜广角相机3。日食深度的测量精度中位数为60 ppm,横跨1.12-1.64微米波长范围的28个光谱通道。这是一个相当大的改进,我们以前实现了90 ppm的精度为一个单一的日食观测使用相同的观测设置。将这些数据与其他波长下报告的数据相结合,WASP-121 b的黑体光谱在>6 σ置信度下被排除,我们确认了先前检索分析的解释,发现数据最好由昼侧热逆解释。更新后的光谱清晰地分辨出1.3-1.6微米的水发射带,信噪比比以前更高。它也未能重现光谱中1.25微米处的隆起,该隆起来自第一次日食观测,该隆起暂时归因于VO发射。我们得出结论,后者要么是统计波动,要么是第一个日食数据集特有的系统性人为因素。

英文摘要:

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.

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。

↑