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Improving the prospects for detecting extrasolar planets in gravitational microlensing events in 2002

Authors:	I ABond FAbe R JDodd J BHearnshaw P MKilmartin KMasuda YMatsubara YMuraki SNoda O K LPetterson N JRattenbury MReid ToSaito YSaito TSako JSkuljan D JSullivan TSumi SWilkinson RYamada TYanagisawa P C MYock

Institution:	¹Faculty of Science, University of Auckland, Auckland, New Zealand; ²Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand; ³Solar–Terrestrial Environment Laboratory, Nagoya University, Nagoya 464, Japan; ⁴School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand; ⁵Tokyo Metropolitan College of Aeronautics, Tokyo 116, Japan

Abstract:	Gravitational microlensing events of high magnification have been shown to be promising targets for detecting extrasolar planets. However, only a few events of high magnification have been found using conventional survey techniques. Here we demonstrate that high-magnification events can be readily found in microlensing surveys using a strategy that combines high-frequency sampling of target fields with on-line difference imaging analysis. We present 10 microlensing events with peak magnifications greater than 40 that were detected in real-time towards the Galactic bulge during 2001 by the Microlensing Observations in Astrophysics (MOA) project. We show that Earth-mass planets can be detected in future events such as these through intensive follow-up observations around the event peaks. We report this result with urgency as a similar number of such events are expected in 2002.

Keywords:	gravitational lensing planetary systems

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