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tokens: T.E., T.K.G., M.J.R. and C.D.W. were visiting astronomers at the InfraRed Telescope Facility, which is operated by the University of Hawaii under Cooperative Agreement no. NNX-08AE38A with the NationalAeronautics and Space Administration, Science Mission Doctorate, Planetary Astronomy Program. We thank the IRTF staff for the support of TEXES observations. Observations with TEXES were supported by NSF Grants NNX-14AG-34G for T.K.G. and AST-0708074 for M.J.R. T.K.G. acknowledges support by NASA Grant NNX14AG34G. T.E. and B.B. acknowledge support from CNRS and Programme National de Planétologie (INSU), and T.F. aknowledges support from UPMC. T.W. acknowledges support from the University of Versailles-St-Quentin and the European Commission Framework Program FP7 under Grant Agreement 606798 (Project EuroVenus). T.E. acknowledges support from the Jet Propulsion Laboratory as a Distinguished Visiting Scientist. We are grateful to Emmanuel Marcq for helpful comments regarding the discussion.