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Fig. 3

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Canopus calibrated squared visibilities, V2 (log scale), closure phases, CP, and errors as a function of the spatial frequency, observed with VLTI/PIONIER (light blue). The red squares correspond to the best-fit-model observables obtained from an MCMC fit on the PIONIER data using a power-law LD and including bandwidth smearing. The residuals of the fit are also shown; the fit details and measured parameters are given in Sect. 2 and in Table 3. The two upper-right figures show a zoom-in on the first two V2 minima, both of which are well sampled by PIONIER. The bottom-right image illustrates Canopus as seen in the H band according to our best-fit power-law LD model.

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