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We present the ground-based detection of the secondary eclipse of thetransiting exoplanet WASP-19b. The observations were made in the Sloan z'-bandusing the ULTRACAM triple-beam CCD camera mounted on the NTT. The measurementshows a 0.088\pm0.019% eclipse depth, matching previous predictions based on H-and K-band measurements. We discuss in detail our approach to the removal oferrors arising due to systematics in the data set, in addition to fitting amodel transit to our data. This fit returns an eclipse centre, T0, of2455578.7676 HJD, consistent with a circular orbit. Our measurement of thesecondary eclipse depth is also compared to model atmospheres of WASP-19b, andis found to be consistent with previous measurements at longer wavelengths forthe model atmospheres we investigated.

z'-band Ground-Based Detection of the Secondary Eclipse of WASP-19b