Transit spectrophotometry of the exoplanet HD 189733b - II. New Spitzer observations at 3.6 μm J.-M. Désert, D. Sing, A. Vidal-Madjar, G. Hébrard, D. Ehrenreich, A. Lecavelier des Etangs, V. Parmentier, R. Ferlet and G. W. Henry A&A, 526 (2011) A12 Published online: 14 December 2010 DOI: 10.1051/0004-6361/200913093