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We performed a population study of 14 hot Jupiter thermal emission spectra observed with the Hubble Space Telescope Wide Field Camera 3 (HST/WFC3) from 1.1 to 1.8 microns. This study includes 6 new spectra and 8 results from the literature. We also presented an updated grid of self-consistent 1D hot Jupiter model thermal structures and emission spectra to compare to these data.
For our population of 14 hot Jupiters we computed the degree of absorption or emission observed in their emergent spectra by quantifying their deviation from a blackbody in a color-magnitude-type plot. We find that the general trend seen in our data matches predictions from our models, with absorption features at the lowest temperatures, emission features at intermediate temperatures, and featureless spectra at the highest temperatures. However, we find significantly more scatter in the strengths of water features than predicted by our models. We investigate potential causes for this scatter and find the most likely explanation is a compositional diversity in these planets' atmospheres.

Population-level trends in hot Jupiter thermal emission spectra