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Accurate physical parameters of exoplanet systems are essential for furtherexploration of planetary internal structure, atmospheres, and formationhistory. We aim to use simultaneous multicolour transit photometry to improvethe estimation of transit parameters, to search for transit timing variations(TTVs), and to establish which of our targets should be prioritised forfollow-up transmission spectroscopy. We performed time series photometricobservations of 12 transits for the hot Jupiters HAT-P-19b, HAT-P-51b,HAT-P-55b, and HAT-P-65b using the simultaneous four-colour camera MuSCAT2 onthe Telescopio Carlos S\'anchez. We collected 56 additional transit lightcurves from TESS photometry. To derive transit parameters, we modelled theMuSCAT2 light curves with Gaussian processes to account for correlated noise.To derive physical parameters, we performed EXOFASTv2 global fits to theavailable transit and radial velocity data sets, together with the Gaia DR3parallax, isochrones, and spectral energy distributions. To assess thepotential for atmospheric characterisation, we compared the multicolour transitdepths with a flat line and a clear atmosphere model. We consistently refinedthe transit and physical parameters. We improved the orbital period andephemeris estimates, and found no evidence for TTVs or orbital decay. TheMuSCAT2 broadband transmission spectra of HAT-P-19b and HAT-P-65b areconsistent with previously published low-resolution transmission spectra. Wealso found that, except for HAT-P-65b, the assumption of a planetary atmospherecan improve the fit to the MuSCAT2 data. In particular, we identified HAT-P-55bas a priority target among these four planets for further atmospheric studiesusing transmission spectroscopy.

Simultaneous multicolour transit photometry of hot Jupiters HAT-P-19b, HAT-P-51b, HAT-P-55b, and HAT-P-65b