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The transiting hot Jupiter planet Qatar-1 b was presented to exhibitvariations in transit times that could be of perturbative nature. A hot Jupiterwith a planetary companion on a nearby orbit would constitute an unprecedentedplanetary configuration, important for theories of formation and evolution ofplanetary systems. We performed a photometric follow-up campaign to confirm orrefute transit timing variations. We extend the baseline of transitobservations by acquiring 18 new transit light curves acquired with 0.6-2.0 mtelescopes. These photometric time series, together with data available in theliterature, were analyzed in a homogenous way to derive reliable transitparameters and their uncertainties. We show that the dataset of transit timesis consistent with a linear ephemeris leaving no hint for any periodicvariations with a range of 1 min. We find no compelling evidence for theexistence of a close-in planetary companion to Qatar-1 b. This finding is inline with a paradigm that hot Jupiters are not components of compactmulti-planetary systems. Based on dynamical simulations, we place tighterconstraints on a mass of any fictitious nearby planet in the system.Furthermore, new transit light curves allowed us to redetermine systemparameters with the precision better than that reported in previous studies.Our values generally agree with previous determinations.

No variations in transit times for Qatar-1 b