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The Exoplanet Characterisation Observatory (EChO) has been studied as a spacemission concept by the European Space Agency in the context of the M3 selectionprocess. Through direct measurement of the atmospheric chemical composition ofhundreds of exoplanets, EChO would address fundamental questions such as: Whatare exoplanets made of? How do planets form and evolve? What is the origin ofexoplanet diversity?  More specifically, EChO is a dedicated survey mission for transit and eclipsespectroscopy capable of observing a large, diverse and well-defined planetarysample within its four to six year mission lifetime.  In this paper we use the end-to-end instrument simulator EChOSim to model thecurrently discovered targets, to gauge which targets are observable and assessthe EChO performances obtainable for each observing tier and time. We show thatEChO would be capable of observing over 170 relativity diverse planets if itwere launched today, and the wealth of optimal targets for EChO expected to bediscovered in the next 10 years by space and ground-based facilities is simplyoverwhelming.  In addition, we build on previous molecular detectability studies to showwhat molecules and abundances will be detectable by EChO for a selection ofreal targets with various molecular compositions and abundances.  EChO's unique contribution to exoplanetary science will be in identifying themain constituents of hundreds of exoplanets in various mass/temperatureregimes, meaning that we will be looking no longer at individual cases but atpopulations. Such a universal view is critical if we truly want to understandthe processes of planet formation and evolution in various environments.  In this paper we present a selection of key results. The full results areavailable online (http://www.ucl.ac.uk/exoplanets/echotargetlist/).

Generation of an optimal target list for the Exoplanet Characterisation Observatory (EChO)