We update the ephemerides of 16 transiting exoplanets using our ground-based observations, new TESS data, and previously published observations including those of amateur astronomers. All these light curves were modeled 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 modeled 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 that can be confirmed with future observations. We also detect a hint of potential periodic variations in the TTV data of HAT-P-13 b which also requires confirmation with further precise observations.
@article{arxiv.2403.17690,
title = {Looking For Timing Variations in the Transits of 16 Exoplanets},
author = {S. Yalçınkaya and E. M. Esmer and Ö. Baştürk and A. Muhaymin and A. C. Kutluay and D. İ. Silistre and F. Akar and J. Southworth and L. Mancini and F. Davoudi and E. Karamanlı and F. Tezcan and E. Demir and D. Yılmaz and E. Güleroğlu and M. Tekin and İ. Taşkın and Y. Aladağ and E. Sertkan and U. Y. Kurt and S. Fişek and S. Kaptan and S. Aliş and N. Aksaker and F. K. Yelkenci and C. T. Tezcan and A. Kaya and D. Oğlakkaya and Z. S. Aydın and C. Yeşilyaprak},
journal= {arXiv preprint arXiv:2403.17690},
year = {2024}
}