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We have used Spitzer and its IRAC camera to search for the transit of thesuper-Earth HD 40307b. The transiting nature of the planet could not be firmlydiscarded from our first photometric monitoring of a transit window because ofthe uncertainty coming from the modeling of the photometric baseline. To obtaina firm result, two more transit windows were observed and a global Bayesiananalysis of the three IRAC time series and the HARPS radial velocities wasperformed. Unfortunately, any transit of the planet during the observed phasewindow is firmly discarded, while the probability that the planet transits butthat the eclipse was missed by our observations is nearly negligible (0.26%).

The Spitzer search for the transits of HARPS low-mass planets - I. No transit for the super-Earth HD 40307b