Abstract

Gravitational microlensing surveys presently discover over 2000 candidate lensing events per year. Only a small fraction of these are ever studied in detail, primarily those thought to be likely candidates for exoplanet discovery. We present results of a comprehensive study, using theoretical models which incorporate lens and source blending, to fit the light curves of all OGLE¹ microlensing candidates discovered during the 2011, 2012 and 2013 observing seasons. We consider the full range of effects, reporting on point-lens fitting of which we find 2123 out of 5293 candidates provide acceptable fits. In addition we have found that there are catalogued counterparts to around 27% of the events. Our study will be the first large and comprehensive study to attempt detailed modeling of lenses with counterparts,

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including point-like lenses, binaries, and planets. To conduct this work we are developing tools that can be applied to ongoing events during future observing seasons, thereby increasing the rates at which we discover binaries and exoplanets.