Thursday, June 9, 2016

The hot Jupiters HATS-11b and HATS-12b

HATS-11b and HATS-12b: Two transiting Hot Jupiters orbiting sub-solar metallicity stars selected for the K2 Campaign 7


Rabus et al


We report the discovery of two transiting extrasolar planets from the HATSouth survey. HATS-11, a V=14.1 G0-star shows a periodic 12.9 mmag dip in its light curve every 3.6192 days and a radial velocity variation consistent with a Keplerian orbit. HATS-11 has a mass of 1.000 ± 0.060 M⊙, a radius of 1.444 ± 0.057 M⊙ and an effective temperature of 6060 ± 150 K, while its companion is a 0.85 ± 0.12 MJ, 1.510 ± 0.078 RJ planet in a circular orbit. HATS-12 shows a periodic 5.1 mmag flux decrease every 3.1428 days and Keplerian RV variations around a V=12.8 F-star. HATS-12 has a mass of 1.489 ± 0.071 M⊙, a radius of 2.21 ± 0.21 R⊙, and an effective temperature of 6408 ± 75 K. For HATS-12, our measurements indicate that this is a 2.38 ± 0.11 MJ, 1.35 ± 0.17 RJ planet in a circular orbit. Both host stars show sub-solar metallicity of -0.390 ± 0.060 dex and -0.100 ± 0.040 dex, respectively and are (slightly) evolved stars. In fact, HATS-11 is amongst the most metal-poor and, HATS-12 is amongst the most evolved stars hosting a hot Jupiter planet. Importantly, HATS-11 and HATS-12 have been observed in long cadence by Kepler as part of K2 campaign 7 (EPIC216414930 and EPIC218131080 respectively).

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