Planets are like children with each one being unique and special. A better understanding of their collective properties requires a deeper understanding of each planet. Here we add the transit and eclipse spectra of hot Jupiter WASP-74b into the ever growing dataset of exoplanet atmosphere spectral library. With six transits and three eclipses using the Hubble Space Telescope (HST) and Spitzer Space Telescope (\textit{Spitzer}), we present the most complete and precise atmospheric spectra of WASP-74b. We found no evidence for TiO/VO nor super-Rayleigh scattering reported in previous studies. The transit shows a muted water feature with strong Rayleigh scattering extending into the infrared. The eclipse shows a featureless blackbody-like WFC3/G141 spectrum and a weak methane absorption feature in the Spitzer 3.6 μm band. Future James Webb Space Telescope (JWST) follow up observations are needed to confirm these results.
@article{arxiv.2110.04415,
title = {The Hubble PanCET program: Transit and Eclipse Spectroscopy of the Hot Jupiter WASP-74b},
author = {Guangwei Fu and Drake Deming and Erin May and Kevin Stevenson and David Sing and Joshua Lothringer and Hannah Wakeford and Nikolay Nikolov and Thomas Evans and Vincent Bourrier and Leonardo Dos Santos and Munazza Alam and Gregory Henry and Antonio Garcia Munoz and Mercedes Lopez-Morales},
journal= {arXiv preprint arXiv:2110.04415},
year = {2021}
}