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

Abstract

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  = 2.50792 days,  = 1.80539 days, and  = 2.87923 days. Follow-up spectroscopic observations reveal the masses of the planets to be  = 4.31 ± 0.47 ,  = 6.10 ± 0.54 , and  = 4.32 ± 0.18 , while model fits to the transit light curves yield radii of  = 1.096 ± 0.14 ,  = 1.135 ± 0.11 , and  = 1.107 ± 0.064 . 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 ).