J/other/Nat/481.167      2002-2007 PLANET microlensing events     (Assan+, 2012)
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Beginning of ReadMe : J/other/Nat/481.167 2002-2007 PLANET microlensing events (Assan+, 2012) ================================================================================ One or more bound planets per Milky Way star from microlensing observations. Cassan A., Kubas D., Beaulieu J.-P., Dominik M., Horne K., Greenhill J., Wambsganss J., Menzies J., Williams A., Jorgensen U., Bennett D.P., Albrow M.D., Batista V., Brillant S., Caldwell J.A.R., Cole A., Coutures C., Cook H., Dieters S., Prester D.D., Donatowicz J., Fouque P., Hill K., Kains N., Kane S., Marquette J.-B., Martin R., Pollard K.R., Sahu K.C., Vinter C., Warren D., Watson B., Zub M., Sumi T., Szymanski M.K., Kubiak M., Poleski R., Soszynski I., Ulaczyk K., Pietrzynski G., Wyrzykowski L. <Nature, 481, 167-169 (2012)> =2012Natur.481..167C ================================================================================ ADC_Keywords: Gravitational lensing ; Stars, variable ; Milky Way ; Magnitudes Keywords: astronomy - astrophysics - planetary sciences Abstract: Most known extrasolar planets (exoplanets) have been discovered using the radial velocity or transit methods. Both are biased towards planets that are relatively close to their parent stars, and studies find that around 17-30% of solar-like stars host a planet. Gravitational microlensing on the other hand, probes planets that are further away from their stars. Recently, a population of planets that are unbound or very far from their stars was discovered by microlensing. These planets are at least as numerous as the stars in the Milky Way. Here we report a statistical analysis of microlensing data (gathered in 2002-07) that reveals the fraction of bound planets 0.5-10AU (Sun-Earth distance) from their stars. We find that of stars host Jupiter-mass planets (0.3-10M_J_, where M_J_=318M_earth_ and M_earth_ is Earth's mass). Cool Neptunes (10-30M_earth_) and super-Earths (5-10M_earth_) are even more common: their respective abundances per star are 52^+22^_-29_% and 62^+35^_-37_%. We conclude that stars are orbited by planets as a rule, rather than the exception.

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