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We update the fundamental physical and orbital properties of the transitinghot-Saturn type exoplanet HAT-P-19b and its host star HAT-P-19 as a result ofthe global modeling of our high-precision transit light curves, an archivespectrum, radial velocity observations, brightness values from broadbandphotometry in different passbands, and the precise distance of the systemderived from its Gaia parallax. We collected all the light curves obtained withground-based photometry by amateur and professional observers, measuredmid-transit times, analyzed their differences from calculated transit timingsbased on reference ephemeris information, which we update as a result. Wehaven't found any periodicity in the residuals of a linear trend, which weattribute to the accumulation of uncertainties in the reference mid-transittime and the orbital period. We discuss the potential origins of the variationin transit timings briefly and find stellar activity as the most likely cause.Finally, we comment on the scenarios describing the formation and migration ofthis hot-Saturn type exoplanet with a bloated atmosphere yet a small core,although it is orbiting a metal-rich ([Fe / H] = 0.24 dex) host star based onthe planetary, orbital, and stellar parameters of the system that we derivedfrom our global model, the age and the evolutionary history of the star.

A Holistic and Probabilistic Approach to the Ground-based Data of HAT-P-19 System