论文标题
Ares I：WASP-76 B，两个HST光谱的故事
ARES I: WASP-76 b, A Tale of Two HST Spectra
论文作者
论文摘要
我们分析了超热木星黄蜂的传输和发射光谱，该木星 - 76b观察到了哈勃太空望远镜的G141 Grism的G141 Grism的宽场摄像头3（WFC3）。在使用公共可用分析套件taurex 3进行全贝叶斯检索之前，我们使用开源软件Iraclis减少并拟合每个观察值的原始数据。考虑到WASP-76的恒星伴侣，我们重新分析了此数据并表明，消除该背景恒星的效果会改变频谱的斜率，从而导致这些可见的吸收器不再被检测到，从而消除了对非灰色云模型的需求，可以充分适合数据，但可以维持以前可以看到的强水功能。但是，我们对发射光谱的分析表明，TIO和大气热反转的存在以及大量的水。鉴于宿主恒星的亮度和大气特征的大小，WASP-76 B是通过HST或未来设施进行进一步表征的绝佳目标，可以更好地了解其大气的性质，以确认TIO的存在并搜索其他光学吸收剂。
We analyse the transmission and emission spectra of the ultra-hot Jupiter WASP-76b, observed with the G141 grism of the Hubble Space Telescope's Wide Field Camera 3 (WFC3). We reduce and fit the raw data for each observation using the open-source software Iraclis before performing a fully Bayesian retrieval using the publicly available analysis suite TauRex 3. Previous studies of the WFC3 transmission spectra of WASP-76 b found hints of titanium oxide (TiO) and vanadium oxide (VO) or non-grey clouds. Accounting for a fainter stellar companion to WASP-76, we reanalyse this data and show that removing the effects of this background star changes the slope of the spectrum, resulting in these visible absorbers no longer being detected, eliminating the need for a non-grey cloud model to adequately fit the data but maintaining the strong water feature previously seen. However, our analysis of the emission spectrum suggests the presence of TiO and an atmospheric thermal inversion, along with a significant amount of water. Given the brightness of the host star and the size of the atmospheric features, WASP-76 b is an excellent target for further characterisation with HST, or with future facilities, to better understand the nature of its atmosphere, to confirm the presence of TiO and to search for other optical absorbers.
