Keele Research Repository

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 ${P}_{{\rm{Q}}3{\rm{b}}}$ = 2.50792 days, ${P}_{{\rm{Q}}4{\rm{b}}}$ = 1.80539 days, and ${P}_{{\rm{Q}}5{\rm{b}}}$ = 2.87923 days. Follow-up spectroscopic observations reveal the masses of the planets to be ${M}_{{\rm{Q}}3{\rm{b}}}$ = 4.31 ± 0.47 ${M}_{{\rm{J}}}$, ${M}_{{\rm{Q}}4{\rm{b}}}$ = 6.10 ± 0.54 ${M}_{{\rm{J}}}$, and ${M}_{{\rm{Q}}5{\rm{b}}}$ = 4.32 ± 0.18 ${M}_{{\rm{J}}}$, while model fits to the transit light curves yield radii of ${R}_{{\rm{Q}}3{\rm{b}}}$ = 1.096 ± 0.14 ${R}_{{\rm{J}}}$, ${R}_{{\rm{Q}}4{\rm{b}}}$ = 1.135 ± 0.11 ${R}_{{\rm{J}}}$, and ${R}_{{\rm{Q}}5{\rm{b}}}$ = 1.107 ± 0.064 ${R}_{{\rm{J}}}$. 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).