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Kepler-20: A Sun-like star with three sub-Neptune exoplanets and two Earth-size candidates

Authors
  • Thomas N Iii, Gautier
  • David, Charbonneau
  • Jason Rowe
  • Geoffrey W, Marcy
  • Howard, Isaacson
  • Guillermo, Torres
  • Francois, Fressin
  • Leslie A, Rogers
  • Jean-Michel, Désert
  • Lars A, Buchhave
  • David W, Latham
  • Samuel N, Quinn
  • David R, Ciardi
  • Daniel C, Fabrycky
  • Eric B, Ford
  • Ronald L, Gilliland
  • Lucianne M, Walkowicz
  • Stephen T, Bryson
  • William D, Cochran
  • Michael, Endl
  • And 24 more
Type
Published Article
Journal
The Astrophysical Journal
Publisher
American Astronomical Society
Publication Date
Mar 16, 2012
Volume
749
Issue
1
Pages
15–15
Source
SETI Institute
License
Unknown

Abstract

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 T eff= 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 transit light curves to deduce a stellar mass of M sstarf= ...

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