tokens: The authors would like to sincerely thank an anonymous referee whose comments led to substantial improvements in the manuscript, Luc Arnold for discussions on the E-ELT capabilities, Franck Selsis for discussions on the thermal-IR emission of planets with an atmosphere during their day–night cycle, and Antoine Crouzier for different comments. A.L. and F.M. thank CNES for their continuous technical support regarding space interferometry, free flying, and high-precision astrometry, and the French POLCA project (ANR-10-BLAN-0511). O.A. acknowledges support from the European Research Council under the European Union's Seventh Framework Program (ERC grant agreement No. 337569) and from the French Community of Belgium through an ARC grant for Concerted Research Action.
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