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Population studies of exoplanets are key to unlocking their statisticalproperties. So far the inferred properties have been mostly limited toplanetary, orbital and stellar parameters extracted from, e.g., Kepler, radialvelocity, and GAIA data. More recently an increasing number of exoplanetatmospheres have been observed in detail from space and the ground. Generally,however, these atmospheric studies have focused on individual planets, with theexception of a couple of works which have detected the presence of water vaporand clouds in populations of gaseous planets via transmission spectroscopy.Here, using a suite of retrieval tools, we analyse spectroscopic andphotometric data of 25 hot Jupiters, obtained with the Hubble and Spitzer SpaceTelescopes via the eclipse technique. By applying the tools uniformly acrossthe entire set of 25 planets, we extract robust trends in the thermal structureand chemical properties of hot Jupiters not obtained in past studies. With therecent launch of JWST and the upcoming missions Twinkle, and Ariel, populationbased studies of exoplanet atmospheres, such as the one presented here, will bea key approach to understanding planet characteristics, formation, andevolution in our galaxy.

Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse