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We present twelve new transit light curves of the hot-Jupiter TrES-3bobserved during $2012-2018$ to probe the transit timing variation (TTV). Bycombining the mid-transit times determined from these twelve transit data withthose re-estimated through uniform procedure from seventy one transit dataavailable in the literature, we derive new linear ephemeris and obtain thetiming residuals that suggest the possibility of TTV in TrES-3 system. However,the frequency analysis shows that the possible TTV is unlikely to be periodic,indicating the absence of an additional body in this system. To explore theother possible origins of TTV, the orbital decay and apsidal precessionephemeris models are fitted to the transit time data. We find decay rate ofTrES-3b to be $\bf \dot{P_q}= -4.1 \pm 3.1$ $ms$ ${yr}^{-1}$ and thecorresponding estimated modified tidal quality factor of ${Q}^{'}_{\ast}$ $\sim1.11 \times {10}^{5}$ is consistent with the theoretically predicted values forthe stars hosting the hot-Jupiters. The shift in the transit arrival time ofTrES-3b after eleven years is expected to be ${T}_{shift}\sim 69.55 \ s$, whichis consistent with the $RMS$ of the timing residuals. Besides, we find that theapsidal precession ephemeris model is statistically less probable than theother considered ephemeris models. It is also discussed that despite the linearephemeris model appears to be the most plausible model to represent the transittime data, the possibility of the orbital decay cannot be completely ruled outin TrES-3 system. In order to confirm this, further high-precision andhigh-cadence follow-up observation of transits of TrES-3b would be important.

Probing Transit Timing Variation and its Possible Origin with Twelve New Transits of TrES-3b