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Fig. 1

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Fit results for WASP-2b. a) Overall Doppler shift reflex motion of the star due to the planet and residuals. b) Zoom on the Rossiter-McLaughlin effect and residuals. Black inverted triangles are SOPHIE data, black triangles represent CORALIE points, red dots show the HARPS data. The best fit model is also pictured as a plain blue line. In addition to our best model found with VsinI = 0.99 km s-1 we also present models with no RM effect plotted as a dotted blue line, RM effect with β = 0 and VsinI = 0.9 km s-1 drawn with a dashed-dotted blue line and RM effect with β = 0 and VsinI = vsinI = 1.6 km s-1 pictured with a dashed-double dotted blue line. In the residuals, the open symbols represent in the values with the size of the circle decreasing with the likelyhood of the model. c) Posterior probability distribution issued from the MCMC showing the distribution of points between ecosω and esinω. d) Posterior probability distribution issued from the MCMC showing the distribution of points between VsinIcosβ and VsinIsinβ. The black disc shows where the distribution would be centred only changing to β = 0. The dotted line shows where zero is. The straight lines represent the median of the distribution, the dashed lines plot the position of the average values, the dash-dotted lines indicate the values with the lowest χ2 (some lines can overlap). The size of boxes c) and d) represents 7 times the 1σ distance on either side of the median.

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