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Space telescopes such as EChO (Exoplanet Characterisation Observatory) andJWST (James Webb Space Telescope) will be important for the future study ofextrasolar planet atmospheres. Both of these missions are capable of performinghigh sensitivity spectroscopic measurements at moderate resolutions in thevisible and infrared, which will allow the characterisation of atmosphericproperties using primary and secondary transit spectroscopy. We use the NEMESISradiative transfer and retrieval tool (Irwin et al. 2008, Lee et al. 2012) toexplore the potential of the proposed EChO mission to solve the retrievalproblem for a range of H2-He planets orbiting different stars. We find thatEChO should be capable of retrieving temperature structure to ~200 K precisionand detecting H2O, CO2 and CH4 from a single eclipse measurement for a hotJupiter orbiting a Sun-like star and a hot Neptune orbiting an M star, alsoproviding upper limits on CO and NH3. We provide a table of retrievalprecisions for these quantities in each test case. We expect around 30Jupiter-sized planets to be observable by EChO; hot Neptunes orbiting M dwarfsare rarer, but we anticipate observations of at least one similar planet.

On the potential of the EChO mission to characterise gas giant atmospheres