HAT - P - 6 b : A HOT JUPITER TRANSITING A BRIGHT F STAR

In the ongoing HATNet survey we have detected a giant planet, with radius 1.33±0.06RJup and mass 1.06± 0.12MJup, transiting the bright (V = 10.5) star GSC 03239-00992. The planet is in a circular orbit with period 3.852985± 0.000005days and mid-transit epoch 2,454,035.67575± 0.00028 (HJD). The parent star is a late F star with mass 1.29± 0.06M⊙, radius 1.46± 0.06R⊙, Teff ∼ 6570± 80K, [Fe/H] = −0.13 ± 0.08 and age ∼ 2.3 −0.7Gy. With this radius and mass, HAT-P-6b has somewhat larger radius than theoretically expected. We describe the observations and their analysis to determine physical properties of the HAT-P-6 system, and briefly discuss some implications of this finding. Subject headings: stars: individual (GSC 03239-00992, HAT-P-6) – planetary systems