  We have carried out a campaign to characterize the hot Jupiters WASP-5b,
WASP-44b and WASP-46b using multiband photometry collected at the
Observat\'orio do Pico Dos Dias in Brazil. We have determined the planetary
physical properties and new transit ephemerides for these systems. The new
orbital parameters and physical properties of WASP-5b and WASP-44b are
consistent with previous estimates. In the case of WASP-46b, there is some
quota of disagreement between previous results. We provide a new determination
of the radius of this planet and help clarify the previous differences. We also
studied the transit time variations including our new measurements. No clear
variation from a linear trend was found for the systems WASP-5b and WASP-44b.
In the case of WASP-46b, we found evidence of deviations indicating the
presence of a companion but statistical analysis of the existing times points
to a signal due to the sampling rather than a new planet. Finally, we studied
the fractional radius variation as a function of wavelength for these systems.
The broad-band spectrums of WASP-5b and WASP-44b are mostly flat. In the case
of WASP-46b we found a trend, but further measurements are necessary to confirm
this finding.
