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Szymanski, M. Kubiak, M.Zub, N. Kains, P. Fouque, R. Martin, R. Poleski, S. Brillant, S. Dieters, S. Kane, T. Sumi, U.G. Jorgensen, V. Batista","submitted_at":"2012-02-04T15:31:05Z","abstract_excerpt":"Most known extrasolar planets (exoplanets) have been discovered using the radial velocity$^{\\bf 1,2}$ or transit$^{\\bf 3}$ methods. Both are biased towards planets that are relatively close to their parent stars, and studies find that around 17--30% (refs 4, 5) of solar-like stars host a planet. Gravitational microlensing$^{\\bf 6\\rm{\\bf -}\\bf 9}$, 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$^{\\bf 10}$. 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