  TASTE (The Asiago Search for Transit timing variations of Exoplanets) project
is collecting high-precision, short-cadence light curves for a selected sample
of transiting exoplanets. It has been claimed that the hot jupiter HAT-P-13b
suddenly deviated from a linear ephemeris by $\sim 20$ min, implying that there
is a perturber in the system. Using five new transits, we discuss the
plausibility of this transit time variation (TTV), and show that a periodic
signal should not be excluded. More follow-up observations are required to
constrain the mass and the orbit of the hypothetical perturber.
