WASP-64 b and WASP-72 b: two new transiting highly irradiated giant planets

We report the discovery by the WASP transit survey of two new highly irradiated giant planets. WASP-64 b is slightly more massive (1.271 plusmn 0.068 M$_Jup$) and larger (1.271 plusmn 0.039 R$_Jup$) than Jupiter, and is in very-short (a = 0.02648 plusmn 0.00024 AU, P = 1.5732918 plusmn 0.0000015 days) circular orbit around a V = 12.3 G7-type dwarf (1.004 plusmn 0.028 M$_⊙$, 1.058 plusmn 0.025 R$_⊙$, T$_eff$ = 5500 plusmn 150 K). Its size is typical of hot Jupiters with similar masses. WASP-72 b has also a mass a bit higher than Jupiter's (1.461$_-0.056$$^+0.059$ M$_Jup$) and orbits very close (0.03708 plusmn 0.00050 AU, P = 2.2167421 plusmn 0.0000081 days) to a bright (V = 9.6) and moderately evolved F7-type star (1.386 plusmn 0.055 M$_⊙$, 1.98 plusmn 0.24 R$_⊙$, T$_eff$ = 6250 plusmn 100 K). Despite its extreme irradiation (5.5 times 10$^9$ erg s$^-1$ cm$^-2$), WASP-72 b has a moderate size (1.27 plusmn 0.20 R$_Jup$) that could suggest a significant enrichment in heavy elements. Nevertheless, the errors on its physical parameters are still too high to draw any strong inference on its internal structure or its possible peculiarity. The photometric time-series used in this work are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/552/A82