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Title: Exoplanet atmospheres with EChO: spectral retrievals using EChOSim
Authors: Barstow, J. K.
Bowles, N. E.
Aigrain, S.
Fletcher, Leigh Nicholas
Irwin, P. G. J.
Varley, R.
Pascale, E.
First Published: 17-Jun-2014
Publisher: Springer Verlag (Germany)
Citation: Experimental Astronomy, 2015, 40 (2), pp. 545-561
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.
DOI Link: 10.1007/s10686-014-9397-y
ISSN: 0922-6435
eISSN: 1572-9508
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © Springer Science+Business Media Dordrecht 2014. The final publication is available at Springer via
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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