Microlens OGLE-2005-BLG-169 Implies That Cool Neptune-like Planets Are Common

@article{Gould2006MicrolensOI,
  title={Microlens OGLE-2005-BLG-169 Implies That Cool Neptune-like Planets Are Common},
  author={A. Gould and Andrzej Udalski and Deokkeun An and David P. Bennett and A. Y. Zhou and Subo Dong and Nicholas J. Rattenbury and B. Scott Gaudi and Ph. Yock and Ian A. Bond and Grant W. Christie and Keith D. Horne and J. M. Anderson and Krzysztof Zbigniew Stanek and Darren Lee Depoy and C. Han and J. Mccormick and B.-G. Park and Richard W. Pogge and Shawn Poindexter and Igor Soszyński and Michał K. Szymański and Marcin Kubiak and Grzegorz Pietrzyński and Olaf Szewczyk and Łukasz Wyrzykowski and Krzysztof Ulaczyk and Bohdan Paczyński and D. M. Bramich and Colin Snodgrass and Iain A. Steele and Martin J. Burgdorf and Michael F. Bode and Christine S. Botzler and Shude Mao and S. Swaving},
  journal={The Astrophysical Journal Letters},
  year={2006},
  volume={644},
  pages={L37 - L40}
}
We detect a Neptune mass ratio (q ≃ 8 × 10-5) planetary companion to the lens star in the extremely high magnification (A ~ 800) microlensing event OGLE-2005-BLG-169. If the parent is a main-sequence star, it has mass M ~ 0.5 M☉, implying a planet mass of ~13 M⊕ and projected separation of ~2.7 AU. When intensely monitored over their peak, high-magnification events similar to OGLE-2005-BLG-169 have nearly complete sensitivity to Neptune mass ratio planets with projected separations of 0.6-1.6… 
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