HAT-P-18b AND HAT-P-19b: TWO LOW-DENSITY SATURN-MASS PLANETS TRANSITING METAL-RICH K STARS

@article{Hartman2010HATP18bAH,
  title={HAT-P-18b AND HAT-P-19b: TWO LOW-DENSITY SATURN-MASS PLANETS TRANSITING METAL-RICH K STARS},
  author={Joel D. Hartman and G{\'a}sp{\'a}r {\'A}. Bakos and Bun’ei Sato and Guillermo Torres and Robert W. Noyes and David W. Latham and G. Kov'acs and D. A. Fischer and Andrew W. Howard and J. A. Johnson and Geoffrey W. Marcy and Lars A. Buchhave and G{\'a}bor F{\"u}r{\'e}sz and Gopakumar Perumpilly and Bence B'eky and Robert P. Stefanik and Dimitar D. Sasselov and Gilbert A. Esquerdo and Mark E. Everett and Zolt{\'a}n Csubry and J'ozsef L'az'ar and Istv{\'a}n Papp and P'al S'ari},
  journal={The Astrophysical Journal},
  year={2010},
  volume={726}
}
We report the discovery of two new transiting extrasolar planets. HAT-P-18b orbits the V = 12.759 K2 dwarf star GSC 2594−00646, with a period P = 5.508023 ±  0.000006 days, transit epoch Tc = 2454715.02174 ±  0.00020 (BJD), and transit duration 0.1131 ±  0.0009 days. The host star has a mass of 0.77 ±  0.03 M☉, radius of 0.75 ±  0.04 R☉, effective temperature 4803 ±  80 K, and metallicity [Fe/H] = +0.10 ±  0.08. The planetary companion has a mass of 0.197 ±  0.013 MJ and radius of 0.995 ±  0… 
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