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Hackstein, M. Kitze, M. Mallonn, M. Mugrauer, M. Seeliger, M. Va\\v{n}ko, R. Chini, R. Errmann, R. Neuh\\\"auser, S. Buder, S. Hellmich, S. Mottola, S. Richter, St. Raetz, T. Ak, T. G\\\"uver, T.O.B. Schmidt, T. Pribulla, V. Wolf, W.P. Chen, X. Zhou, Z.Y. Wu","submitted_at":"2015-08-25T16:33:49Z","abstract_excerpt":"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 show TTVs due to the known properties of their host systems based on the respective discovery papers. During the past three years 46 transit observations were carried out, mostly using telescopes of the Young Exoplanet Transit Initiative. The analyses are used to refine the systems orbital parameters. 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