Orbital motion changes binary-lens caustic-crossing cross sections dramatically in specific geometries but averages to ~0.1% over a realistic Milky Way population, leaving a predicted caustic-crossing rate of 6.3% among u0<1 events.
Binary Lenses in OGLE III EWS Database. Season 2005
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abstract
We present nine new binary lens candidates from OGLE-III Early Warning System database for the season of 2005. We have also found four events interpreted as single mass lensing of double sources. The candidates have been selected by visual light curves inspection. Examining the models of binary lenses in our previous studies (10 caustic crossing events of OGLE-II seasons 1997--1999 and 34 binary lens events of OGLE-III seasons 2002--2004, including one planetary event), in this work and in three publications concerning planetary events of season 2005, we find four cases of extreme mass ratio binaries (q<0.01), and almost all other models with mass ratios in the range 0.1<q<1.0, which may indicate the division between planetary systems and binary stars.
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Rate of caustic crossing microlensing events in stellar binary lenses with significant orbital motion
Orbital motion changes binary-lens caustic-crossing cross sections dramatically in specific geometries but averages to ~0.1% over a realistic Milky Way population, leaving a predicted caustic-crossing rate of 6.3% among u0<1 events.