In Edwards et al. (2020) we present the analysis of Hubble WFC3 observations of a temperate super-Earth. With a radius of 1.7 R⊕ and a density of 7.5 g/cm−3, LHS 1140 b is likely to be a rocky world and, with an equilibrium temperature of ∼235 K, is within the conservative habitable-zone of its star.
Atmospheric models with water vapour can explain this data but stellar contamination cannot be ruled out.
Observations with future facilities (e.g. the James Webb Space Telescope) will be capable of confirming, or refuting, this atmospheric detection.