Motivated by the unsettled conclusion on whether there are any transit timing variations (TTVs) for the exoplanet Qatar-1b, 10 new transit light curves are presented and the TTV analysis with a baseline of 1400 epochs are performed. Because the linear model provides a good fitting with reduced chi-square = 2.59 and the false-alarm probabilities of possible TTV frequencies are as large as 35 %, our results are consistent with a null-TTV model. Nevertheless, a new ephemeris with the reference time T_0 = 2455647.63360\pm 0.00008 (BJD) and the period P= 1.4200236\pm 0.0000001 (day) is obtained. In addition, the updated orbital semi-major axis and planetary radius in unit of stellar radius are being provided, and the lower limit of modified stellar tidal quality factor is also determined.
@article{arxiv.2012.08184,
title = {Are There Transit Timing Variations for the Exoplanet Qatar-1b ?},
author = {Li-Hsin Su and Ing-Guey Jiang and Devesh P. Sariya and Chiao-Yu Lee and Li-Chin Yeh and Vineet Kumar Mannaday and Parijat Thakur and D. K. Sahu and Swadesh Chand and A. A. Shlyapnikov and V. V. Moskvin and Vladimir Ignatov and David Mkrtichian and Evgeny Griv},
journal= {arXiv preprint arXiv:2012.08184},
year = {2021}
}
Comments
typo corrected, 24 pages, 5 tables, 5 figures, accepted by AJ