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To investigate the origin of the features discovered in the exoplanetpopulation, the knowledge of exoplanets' mass and radius with a good precisionis essential. In this paper, we report the discovery of three transitingexoplanets by the SuperWASP survey and the SOPHIE spectrograph with mass andradius determined with a precision better than 15 %. WASP-151b and WASP-153bare two hot Saturns with masses, radii, densities and equilibrium temperaturesof 0.31^{+0.04}_{-0.03} MJ, 1.13^{+0.03}_{-0.03} RJ, 0.22^{-0.03}_{-0.02} rhoJand 1, 290^{+20}_{-10} K, and 0.39^{+0.02}_{-0.02} MJ, 1.55^{+0.10}_{-0.08} RJ,0.11^{+0.02}_{-0.02} rhoJ and 1, 700^{+40}_{-40} K, respectively. Their hoststars are early G type stars (with magV ~ 13) and their orbital periods are4.53 and 3.33 days, respectively. WASP-156b is a Super-Neptune orbiting a Ktype star (magV = 11.6) . It has a mass of 0.128^{+0.010}_{-0.009} MJ, a radiusof 0.51^{+0.02}_{-0.02} RJ, a density of 1.0^{+0.1}_{-0.1} rhoJ, an equilibriumtemperature of 970^{+30}_{-20} K and an orbital period of 3.83 days. WASP-151bis slightly inflated, while WASP-153b presents a significant radius anomaly.WASP-156b, being one of the few well characterised Super-Neptunes, will help toconstrain the formation of Neptune size planets and the transition between gasand ice giants. The estimates of the age of these three stars confirms thetendency for some stars to have gyrochronological ages significantly lower thantheir isochronal ages. We propose that high eccentricity migration couldpartially explain this behaviour for stars hosting a short period planet.Finally, these three planets also lie close to (WASP-151b and WASP-153b) orbelow (WASP-156b) the upper boundary of the Neptunian desert. Theircharacteristics support that the ultra-violet irradiation plays an importantrole in this depletion of planets observed in the exoplanet population.

The discovery of WASP-151b, WASP-153b, WASP-156b: Insights on giant planet migration and the upper boundary of the Neptunian desert