* Astronomy

Title: 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
Author: Joel D. Hartman (Princeton), Waqas Bhatti (Princeton), Gáspár A. Bakos (Princeton), Allyson Bieryla (CfA), Géza Kovács (Konkoly), David W. Latham (CfA), Zoltan Csubry (Princeton), Miguel de Val-Borro (Princeton), Kaloyan Penev (Princeton), Lars A. Buchhave (CfA), Guillermo Torres (CfA), Andrew W. Howard (IfA), Geoff W. Marcy (UC Berkeley), John A. Johnson (CfA), Howard Isaacson (UC Berkeley), Bun'ei Sato (Tokyo Inst. of Tech.), Isabelle Boisse (Aix Marseille Université), Emilio Falco (CfA), Mark E. Everett (NOAO), Tamas Szklenar (Hungarian Astronomical Association), Benjamin J. Fulton (IfA), Avi Shporer (JPL), Tamas Kovács (Konkoly), Terese Hansen (Landessternwarte), Bence Béky (Google), Robert W. Noyes (CfA), József Lázár (Hungarian Astronomical Association), et al. (2 additional authors not shown)

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 a radius of 1.29 R_J, and orbits a bright (V = 11.8 mag) M = 1.27 M_sun, R = 1.70 R_sun star every P = 3.1220 days. The planet HAT-P-51b has a mass of 0.31 M_J and a radius of 1.29 R_J, and orbits a V = 13.4 mag, M = 0.98 M_sun, R = 1.04 R_sun star with a period of P = 4.2180 days. The planet HAT-P-52b has a mass of 0.82 M_J and a radius of 1.01 R_J, and orbits a V = 14.1 mag, M = 0.89 M_sun, R = 0.89 R_sun star with a period of P = 2.7536 days. The planet HAT-P-53b has a mass of 1.48 M_J and a radius of 1.32 R_J, and orbits a V = 13.7 mag, M = 1.09 M_sun, R = 1.21 R_sun 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_star 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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