Yalcinkaya, S.Esmer, E. M.Basturk, O.Muhaymin, A.Kutluay, A. C.Silistre, D. I.Akar, F.Southworth, J.Mancini, L.Davoudi, F.Karamanli, E.Tezcan, F.Demir, E.Yilmaz, D.Guleroglu, E.Tekin, M.Taskin, I.Aladag, Y.Sertkan, E.Kurt, U. Y.Fisek, S.Kaptan, S.Alis, S.Aksaker, N.Yelkenci, F. K.Tezcan, C. T.Kaya, A.Oglakkaya, D.Aydin, Z. S.Yesilyaprak, C.2025-02-272025-02-272024-04-050035-8711https://hdl.handle.net/11693/116944We update the ephemerides of 16 transiting exoplanets using our ground-based observations, new Transiting Exoplanet Survey Satellite data, and previously published observations including those of amateur astronomers. All these light curves were modelled by making use of a set of quantitative criteria with the exofast code to obtain mid-transit times. We searched for statistically significant secular and/or periodic trends in the mid-transit times. We found that the timing data are well modelled by a linear ephemeris for all systems except for XO-2 b, for which we detect an orbital decay with the rate of -12.95 +/- 1.85 ms yr(-1) that can be confirmed with future observations. We also detect a hint of potential periodic variations in the transit timing variation data of HAT-P-13 b, which also requires confirmation with further precise observations.EnglishMethods: observationalTechniques: photometricStars: individual: GJ 1214, HAT-P-1, HAT-P-10, HAT-P-13, HAT-P-16, HAT-P-22, HAT-P-30, HAT-P-53, KELT-3, QATAR-2, WASP-8, WASP-44, WASP-50, WASP-77A, WASP-93, and XO-2Planetary systemsArticle10.1093/mnras/stae8541365-2966