Are There Transit Timing Variations for the Exoplanet Qatar-1b ?

15 Dec 2020  ·  Li-Hsin Su, Ing-Guey Jiang, Devesh P. Sariya, Chiao-Yu Lee, Li-Chin Yeh, Vineet Kumar Mannaday, Parijat Thakur, D. K. Sahu, Swadesh Chand, A. A. Shlyapnikov, V. V. Moskvin, Vladimir Ignatov, David Mkrtichian, Evgeny Griv ·

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. read more

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Earth and Planetary Astrophysics