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

Motivated by the unsettled conclusion on whether there are any transit timing variations (TTVs) for exoplanet Qatar-1b, 10 new light curves presented and a TTV analysis with baseline of 1400 epochs is performed. Because linear model provides good fit reduced chi-square false-alarm probabilities possible frequencies as large 35%, our results consistent null-TTV model. Nevertheless, ephemeris reference time T0 = 2455647.63360 ± 0.00008 (BJD) period P 1.4200236 0.0000001 (day) obtained. In addition, updated orbital semimajor axis planetary radius in units stellar provided, lower limit modified tidal quality factor also determined.