HAT - P - 12 b : A LOW - DENSITY SUB - SATURN MASS PLANET TRANSITING A METAL - POOR K DWARF
نویسندگان
چکیده
We report on the discovery of HAT-P-12b, a transiting extrasolar planet orbiting the moderately bright V ≈ 12.8 K4 dwarf GSC 03033-00706, with a period P = 3.2130598 ± 0.0000021 d, transit epoch Tc = 2454419.19556± 0.00020 (BJD) and transit duration 0.0974± 0.0006d. The host star has a mass of 0.73 ± 0.02M⊙, radius of 0.70 +0.02 −0.01R⊙, effective temperature 4650 ± 60K and metallicity [Fe/H ] = −0.29 ± 0.05. The planetary companion has a mass of 0.211 ± 0.012MJ, and radius of 0.959 −0.021RJ yielding a mean density of 0.295 ± 0.025 g cm . Comparing these observations with recent theoretical models we find that HAT-P-12b is consistent with a ∼ 1−4.5 Gyr, mildly irradiated, H/He dominated planet with a core mass MC . 10M⊕. HAT-P-12b is thus the least massive H/He dominated gas giant planet found to date. This record was previously held by Saturn. Subject headings: planetary systems — stars: individual (HAT-P-12, GSC 03033-00706) techniques: spectroscopic, photometric
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