Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common

Details Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0903g&link_type=abstract

American Astronomical Society Meeting 208, #9.03; Bulletin of the American Astronomical Society, Vol. 38, p.88

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We report the detection a Neptune mass-ratio (q 8e-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&sun; 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 to 1.6 Einstein radii, corresponding to 1.6--4.3 AU in the present case. Only two other such events were monitored well enough to detect Neptunes, and so this detection by itself suggests that Neptune mass-ratio planets are common. Moreover, another Neptune was recently discovered at a similar distance from its parent star in a low-magnification event, which are more common but are individually much less sensitive to planets. Combining the twodetections yields 90% upper and lower frequency limits f=0.37+0.30-0.21 over just 0.4 decades of planet-star separation. Analogs of OGLE-2005-BLG-169Lb orbiting nearby stars would be difficult to detect by other methods of planet detection, including radial velocities, transits, or astrometry.

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