Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP40 and WASP-21 systems
Seeliger, M. and Kitze, M. and Errmann, R. and Richter, S. and Ohlert, J. M. and Chen, W. P. and Guo, J. K. and Göğüş, Ersin and Güver, T. and Aydın, Berk and Mottola, S. and Hellmich, S. and Fernandez, M. and Aceituno, F. J. and Dimitrov, D. and Kjurkchieva, D. and Jensen, E. and Cohen, D. and Kundra, E. and Pribulla, T. and Vanko, M. and Budaj, J. and Mallonn, M. and Wu, Z. -Y. and Zhou, X. and Raetz, St. and Adam, C. and Schmidt, T. O. B. and Ide, A. and Mugrauer, M. and Marschall, L. and Hackstein, M. and Chini, R. and Haas, M. and Ak, T. and Güzel, E. and Özdönmez, A. and Ginski, C. and Marka, C. and Schmidt, J. G. and Dinçel, B. and Werner, K. and Dathe, A. and Greif, J. and Wolf, V. and Buder, S. and Pannicke, A. and Puchalski, D. and Neuhaeuser, R. (2015) Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP40 and WASP-21 systems. Monthly Notices of the Royal Astronomical Society, 451 (4). pp. 4060-4072. ISSN 0035-8711 (Print) 1365-2966 (Online)
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Official URL: http://dx.doi.org/10.1093/mnras/stv1187
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. In all cases we found no hints for significant TTVs, or changes in the system parameters inclination, fractional stellar radius and planet-to-star radius ratio. However, comparing our results with those available in the literature shows that we can confirm the already published values.
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