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As part of our ongoing effort to investigate transit timing variations (TTVs)of known exoplanets, we monitored transits of the four exoplanets HAT-P-18b,HAT-P-19b, HAT-P-27b/WASP-40b and WASP-21b. All of them are suspected to showTTVs due to the known properties of their host systems based on the respectivediscovery papers. During the past three years 46 transit observations werecarried out, mostly using telescopes of the Young Exoplanet Transit Initiative.The analyses are used to refine the systems orbital parameters. In all cases wefound no hints for significant TTVs, or changes in the system parametersinclination, fractional stellar radius and planet to star radius ratio.However, comparing our results with those available in the literature showsthat we can confirm the already published values.

Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP-40 and WASP-21 systems