Qatar Exoplanet Survey : Qatar-3b, Qatar-4b, and Qatar-5b

We report the discovery of Qatar-3b, Qatar-4b, and Qatar-5b, three new transiting planets identified by the Qatar Exoplanet Survey. The three planets belong to the hot Jupiter family, with orbital periods of {P}_{{Q}3{{b}}} = 2.50792 days, {P}_{{Q}4{{b}}} = 1.80539 days, and {P}_{{Q}5{{b}}} = 2.87923 days. Follow-up spectroscopic observations reveal the masses of the planets to be {M}_{{Q}3{{b}}} = 4.31 ± 0.47 {M}_{{J}}, {M}_{{Q}4{{b}}} = 6.10 ± 0.54 {M}_{{J}}, and {M}_{{Q}5{{b}}} = 4.32 ± 0.18 {M}_{{J}}, while model fits to the transit light curves yield radii of {R}_{{Q}3{{b}}} = 1.096 ± 0.14 {R}_{{J}}, {R}_{{Q}4{{b}}} = 1.135 ± 0.11 {R}_{{J}}, and {R}_{{Q}5{{b}}} = 1.107 ± 0.064 {R}_{{J}}. The host stars are low-mass main sequence stars with masses and radii M _Q3 = 1.145 ± 0.064 M _⊙, M _Q4 = 0.896 ± 0.048 M _⊙, M _Q5 = 1.128 ± 0.056 M _⊙ and R _Q3 = 1.272 ± 0.14 R _⊙, R _Q4 = 0.849 ± 0.063 R _⊙, and R _Q5 = 1.076 ± 0.051 R _⊙ for Qatar-3, 4, and 5 respectively. The V magnitudes of the three host stars are V _Q3 = 12.88, V _Q4 = 13.60, and V _Q5 = 12.82. All three new planets can be classified as heavy hot Jupiters (M > 4 M _J).