We report the discovery of two transiting extrasolar planets from the HATSouth survey. HATS-11, a V = 14.1 G0-star shows a periodic 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 1.0000 0.060 M⊙, a radius of 1.444 ± 0.057 R⊙ 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-12b, 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 subsolar metallicities of -0.390 ± 0.060 dex and dex, respectively, and are (slightly) evolved stars. In fact, HATS-11 is among the most metal-poor and, HATS-12, with a log g∗ of 3.923 0.0065, is among 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).
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- planetary systems
- stars: individual (HATS-11 - HATS-12)
- techniques: photometric
- techniques: spectroscopic