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We have initiated a dedicated project to follow-up with ground-basedphotometry the transiting planets discovered by CoRoT in order to refine theorbital elements, constrain their physical parameters and search for additionalbodies in the system. From 2012 September to 2016 December we carried out 16transit observations of six CoRoT planets (CoRoT-5b, CoRoT-8b, CoRoT-12b,CoRoT-18b, CoRoT-20b, and CoRoT-27b) at three observatories located in Germanyand Spain. These observations took place between 5 and 9 yr after the planet'sdiscovery, which has allowed us to place stringent constraints on the planetaryephemeris. In five cases we obtained light curves with a deviation of themid-transit time of up to ~115min from the predictions. We refined theephemeris in all these cases and reduced the uncertainties of the orbitalperiods by factors between 1.2 and 33. In most cases our determined physicalproperties for individual systems are in agreement with values reported inprevious studies. In one case, CoRoT-27b, we could not detect any transit eventin the predicted transit window.

Transit analysis of the CoRoT-5, CoRoT-8, CoRoT-12, CoRoT-18, CoRoT-20, and CoRoT-27 systems with combined ground- and space-based photometry