Atmospheric composition of HAT-P-26b

One that got into the news a bit: Hubble/Spitzer analysis of HAT-P-26b indicates that the atmosphere has a similar metallicity to that of Jupiter and is likely primordial.

Press release on SpaceRef: Exoplanet HAT-P-26b Has A Primitive Atmosphere

Wakeford et al. "HAT-P-26b: A Neptune-Mass Exoplanet with a Well Constrained Heavy Element Abundance"
https://arxiv.org/abs/1705.04354