  We present a photometric follow-up of transiting exoplanets HAT-P-3b and
TrES-3b, observed by using several optical and near-infrared filters, with four
small-class telescopes (D = 36--152cm) in the Northern Hemisphere. Two of the
facilities present their first scientific results. New 10 HAT-P-3b light curves
and new 26 TrES-3b light curves are reduced and combined by filter in order to
improve the quality of the photometry. Combined light curves fitting is carried
out independently by using two different analysis packages, allowing the
corroboration of the orbital and physical parameters in the literature. Results
find no differences in the relative radius with the observing filter. In
particular, we report for HAT-P-3b a first estimation of the planet-to-star
radius Rp/R* = 0.1112+0.0025-0.0026 in the B band which is coherent with values
found in the VRIz'JH filters. Concerning TrES-3b, we derive a value for the
orbital period of P = 1.3061862+-0.0000001 days which shows no linear
variations over nine years of photometric observations.

Earth and Planetary Astrophysics