  In this study, the transit observations of HAT-P-16b and TrES-3b exoplanets
were carried out at \c{C}\"U UZAYMER Observatory with a 50 cm Ritchey Chretien
type telescope. By analyzing the light curves of both exoplanets, system
parameters have been obtained with acceptable models. Some of these parameters
for HAT-P-16 systems were found to be: M$_{P}$=4.172$\pm$0.163 M$_{J}$,
R$_{P}$=1.309$\pm$0.111 R$_{J}$, a/R$_{*}$=7.1922$\pm$0.0017 and
b=0.1003$\pm$0.1533 which are consistent with the values given in
\cite{2010ApJ...720.1118B}. Also, for the TrES-3 system, the same parameters
were calculated as M$_{P}$=1.959$\pm$0.111 M$_{J}$, R$_{P}$=1.320$\pm$0.169
R$_{J}$, a/R$_{*}$=6.0656$\pm$ 0.4899 and b=0.7892$\pm$0.0700. These values are
also consistent with the values given in \cite{2007ApJ...663L..37O}. No
significant Transit Timing Variations (TTV) was found as a result of the
Lomb-Scargle (LS) periodogram for HAT-P-16b by using the transit times obtained
from the transit light curves (False Alarm Probabilities -- FAP) = \%96).
However, a significant periodicity was found at 32.38 days and a secondary
periodicity was found at 41.07 days were determined as a result of the LS
periodogram obtained from the TrES-3b data. We interpret that these periods
with FAP of 3.41 \% and 1.88 \%, respectively, are close to the rotation period
of the host star. Therefore, these periods could be due to the modulation of
spot-induced light variations.
