Modeling Venus photometric profile with a Lambert law. Top panel: the black line is the mean photometric profile of Venus along the NS direction, and the red line is the best-fit profile. Bottom panel: the above fitting was obtained by maximizing the likelihood of a Lambert-sphere model to the THEMIS observations with an MCMC algorithm. Each subpanel represents the two-parameter joint posterior distributions of all free parameters. The 68.3, 95.5, and 99.7% confidence regions are denoted by three different gray levels. The PDFs are plotted at the bottom and right of thepanels. The dotted lines indicate the maximum probability value of the PDF of each parameter. After 500 000 iterations, the fitted values are arcsec for the seeing, arcsec for the apparent radius, and arcsec for the planet decentering with respect to the center of the detector. The red curve on the top panel indicates the result of the fitted values.
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