KEPLER-20: A SUN-LIKE STAR WITH THREE SUB-NEPTUNE EXOPLANETS AND TWO EARTH-SIZE CANDIDATES

@article{Gautier2011KEPLER20AS,
  title={KEPLER-20: A SUN-LIKE STAR WITH THREE SUB-NEPTUNE EXOPLANETS AND TWO EARTH-SIZE CANDIDATES},
  author={Thomas Gautier and David Charbonneau and Jason F. Rowe and Geoffrey W. Marcy and Howard T. Isaacson and Guillermo Torres and François Fressin and Leslie A. Rogers and J.-M. D'esert and Lars A. Buchhave and David W. Latham and Samuel N. Quinn and David R. Ciardi and Daniel C. Fabrycky and Eric B. Ford and Ronald L. Gilliland and Lucianne M. Walkowicz and Stephen T. Bryson and William D. Cochran and Michael Endl and Debra A. Fischer and Steve B. Howel and Elliott P. Horch and Thomas Barclay and Natalie M. Batalha and William J. Borucki and Jessie L. Christiansen and John Charles Geary and Christopher E. Henze and Matthew J. Holman and Khadeejah A. Ibrahim and Jon M. Jenkins and Karen Kinemuchi and David G. Koch and Jack J. Lissauer and Dwight T. Sanderfer and Dimitar D. Sasselov and Sara Seager and Kathryn Silverio and Jeffrey C. Smith and Martin D. Still and Martin C. Stumpe and Peter Tenenbaum and Jeffrey Edward van Cleve},
  journal={The Astrophysical Journal},
  year={2011},
  volume={749}
}
We present the discovery of the Kepler-20 planetary system, which we initially identified through the detection of five distinct periodic transit signals in the Kepler light curve of the host star 2MASS J19104752+4220194. From high-resolution spectroscopy of the star, we find a stellar effective temperature Teff = 5455 ± 100 K, a metallicity of [Fe/H] = 0.01 ± 0.04, and a surface gravity of log g = 4.4 ± 0.1. We combine these estimates with an estimate of the stellar density derived from the… 

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