Transmission spectrum of super-puff Kepler-79d

Infrared transmission spectrum of the ~0.08 g/cm³ planet Kepler-79d.

Chachan et al. "A Featureless Infrared Transmission Spectrum for the Super-Puff Planet Kepler-79d"
https://arxiv.org/abs/2008.05480

Supports the idea that the super-puff planets have high-altitude hazes.

Quote :

We find that photochemical hazes offer an attractive explanation for the observed properties of super-puffs like Kepler-79d, as they simultaneously render the near-infrared spectrum featureless and reduce the inferred envelope mass loss rate by moving the measured radius (optical depth unity surface during transit) to lower pressures.