Kepler-9: A System of Multiple Planets Transiting a Sun-Like Star, Confirmed by Timing Variations

  title={Kepler-9: A System of Multiple Planets Transiting a Sun-Like Star, Confirmed by Timing Variations},
  author={M. Holman and D. Fabrycky and D. Ragozzine and E. Ford and J. Steffen and W. Welsh and J. Lissauer and D. Latham and G. Marcy and L. Walkowicz and N. Batalha and J. Jenkins and J. Rowe and W. Cochran and F. Fressin and G. Torres and L. Buchhave and D. Sasselov and W. Borucki and D. Koch and G. Basri and T. Brown and D. Caldwell and D. Charbonneau and E. Dunham and T. Gautier and J. Geary and R. Gilliland and M. R. Haas and S. Howell and D. Ciardi and M. Endl and D. Fischer and G. F{\"u}r{\'e}sz and J. Hartman and H. Isaacson and J. Johnson and P. MacQueen and A. Moorhead and R. C. Morehead and J. Orosz},
  pages={51 - 54}
Extra Exoplanet? A planet is said to transit its star if it can be seen to pass in front of the star; 19% of the known extrasolar planets are transiting planets. A lone planet will transit in an exactly periodic manner; if other planets are present, however, variations in transit duration are expected because of gravitational interactions. Holman et al. (p. 51, published online 26 August; see the cover; see the Perspective by Laughlin) report timing variations in the transits of two exoplanets… Expand
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