2015barstow_echo.pdf (2.74 MB)
Download file

Exoplanet atmospheres with EChO: spectral retrievals using EChOSim

Download (2.74 MB)
journal contribution
posted on 02.03.2016, 11:42 by J. K. Barstow, N. E. Bowles, S. Aigrain, Leigh Nicholas Fletcher, P. G. J. Irwin, R. Varley, E. Pascale
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.

History

Citation

Experimental Astronomy, 2015, 40 (2), pp. 545-561

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

Experimental Astronomy

Publisher

Springer Verlag (Germany)

issn

0922-6435

eissn

1572-9508

Acceptance date

23/05/2014

Copyright date

2014

Available date

02/03/2016

Publisher version

http://link.springer.com/article/10.1007/s10686-014-9397-y

Language

en

Usage metrics

Categories

Exports