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Exoplanet atmospheres with EChO: spectral retrievals using EChOSim |
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| Authors: | Joanna K Barstow Neil E Bowles Suzanne Aigrain Leigh N Fletcher Patrick G J Irwin Ryan Varley Enzo Pascale |
| Institution: | 1. Department of Physics, University of Oxford, Oxford, UK 2. Department of Physics, University College London, London, UK 3. School of Physics and Astronomy, University of Cardiff, Cardiff, UK |
| Abstract: | We demonstrate the effectiveness of the Exoplanet Characterisation Observatory mission concept for constraining the atmospheric properties of hot and warm gas giants and super Earths. Synthetic primary and secondary transit spectra for a range of planets are passed through EChOSim 13] to obtain the expected level of noise for different observational scenarios; these are then used as inputs for the NEMESIS atmospheric retrieval code and the retrieved atmospheric properties (temperature structure, composition and cloud properties) compared with the known input values, following the method of 1]. To correctly retrieve the temperature structure and composition of the atmosphere to within 2 σ, we find that we require: a single transit or eclipse of a hot Jupiter orbiting a sun-like (G2) star at 35 pc to constrain the terminator and dayside atmospheres; 20 transits or eclipses of a warm Jupiter orbiting a similar star; 10 transits/eclipses of a hot Neptune orbiting an M dwarf at 6 pc; and 30 transits or eclipses of a GJ1214b-like planet. |
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