Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP40 and WASP-21 systems

• Published in: Monthly notices of the Royal Astronomical Society Vol. 451; no. 4; pp. 4060 - 4072
• Main Authors: Seeliger, M., Kitze, M., Errmann, R., Richter, S., Ohlert, J. M., Chen, W. P., Guo, J. K., Göğüş, E., Güver, T., Aydın, B., Mottola, S., Hellmich, S., Fernandez, M., Aceituno, F. J., Dimitrov, D., Kjurkchieva, D., Jensen, E., Cohen, D., Kundra, E., Pribulla, T., Vaňko, M., Budaj, J., Mallonn, M., Wu, Z.-Y., Zhou, X., Raetz, St, Adam, C., Schmidt, T. O. B., Ide, A., Mugrauer, M., Marschall, L., Hackstein, M., Chini, R., Haas, M., Ak, T., Güzel, E., Özdönmez, A., Ginski, C., Marka, C., Schmidt, J. G., Dincel, B., Werner, K., Dathe, A., Greif, J., Wolf, V., Buder, S., Pannicke, A., Puchalski, D., Neuhäuser, R.
• Format: Journal Article
• Language: English
• Published: London Oxford University Press 21-08-2015
• Subjects: Astronomical instruments; Astronomy; Extrasolar planets; Ground-based observation; Inclination; Orbitals; Orbits; Planets; Space telescopes; Stars & galaxies; Telescopes; Time measurements; Transit; planets and satellites: individual: HAT-P-19b; planets and satellites: individual: HAT-P-18b; planets and satellites: individual: WASP-21b; planets and satellites: individual: HAT-P-27b/WASP-40b
• ISSN: 0035-8711; 1365-2966
• DOI: 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.