HAT-P-50b, HAT-P-51b, HAT-P-52b, AND HAT-P-53b: THREE TRANSITING HOT JUPITERS AND A TRANSITING HOT SATURN FROM THE HATNET SURVEY

We report the discovery and characterization of four transiting exoplanets by the HATNet survey. The planet HAT-P-50b has a mass of 1.35 ?> M J ?> and radius of 1.29 ?> R J ?> , and orbits a bright ( V = 11.8 ?> mag) M = 1.27 ?> M ⊙ ?> , R = 1.70 ?> R ⊙ ?> star every P = 3.1220 ?> days. The planet HAT-P-51b has a mass of 0.31 ?> M J ?> and radius of 1.29 ?> R J ?> , and orbits a V = 13.4 ?> mag, M = 0.98 ?> M ⊙ ?> , R = 1.04 ?> R ⊙ ?> star with a period of P = 4.2180 ?> days. The planet HAT-P-52b has a mass of 0.82 ?> M J ?> and radius of 1.01 ?> R J ?> , and orbits a V = 14.1 ?> mag, M = 0.89 ?> M ⊙ ?> , R = 0.89 ?> R ⊙ ?> star with a period of P = 2.7536 ?> days. The planet HAT-P-53b has a mass of 1.48 ?> M J ?> and radius of 1.32 ?> R J ?> , and orbits a V = 13.7 ?> mag, M = 1.09 ?> M ⊙ ?> , R = 1.21 ?> R ⊙ ?> star with a period of P = 1.9616 ?> days. All four planets are consistent with having circular orbits and have masses and radii measured to better than 10% precision. The low stellar jitter and favorable R p ?> / R ⋆ ?> ratio for HAT-P-51 make it a promising target for measuring the Rossiter–McLaughlin effect for a Saturn-mass planet.

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