Incidence of HD 189733’s variability on individual transit-depth estimates in the Spitzer/IRAC 8-μm channel. Transit-depth estimated for six transits in individual (markers) and global (solid line, the dashed lines refer to the 1σ error bar) analyses. Our estimates (green) show no significant transit-depth variation with the relative eclipse phase (blue numbers) in opposition to Agol et al. (2010) (red). Similarly, we observe no significant variation of the transit parameters from one individual analysis to another. In addition, we observe no pattern specific to the occultation of a star spot (i.e., similar to, e.g., “Features A and B” in Fig. 1 of Pont et al. 2007). Therefore, we consider that our time-averaged inferences (see Sect. 5) are not biased by HD 189733’s activity.