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Study by MOA of extrasolar planets in gravitational microlensing events of high magnification |
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| Authors: | I A Bond N J Rattenbury J Skuljan F Abe R J Dodd J B Hearnshaw M Honda J Jugaku P M Kilmartin A Marles K Masuda Y Matsubara Y Muraki T Nakamura G Nankivell S Noda C Noguchi K Ohnishi M Reid To Saito H Sato M Sekiguchi D J Sullivan T Sumi M Takeuti Y Watase S Wilkinson R Yamada T Yanagisawa P C M Yock |
| Institution: | Faculty of Science, University of Auckland, Auckland, New Zealand,; Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand,; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464, Japan,; School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand,; Carter Observatory, PO Box 2909, Wellington, New Zealand,; Institute of Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188, Japan,; Research Institute of Civilization, Tama 206, Japan,; Department of Physics, Kyoto University, Kyoto 606, Japan,; Nagano National College of Technology, Japan,; Tokyo Metropolitan College of Aeronautics, Tokyo 116, Japan,; Tohoku University, Sendai, Japan and; KEK Laboratory, Tsukuba 305, Japan |
| Abstract: | A search for extrasolar planets was carried out in three gravitational microlensing events of high magnification, MACHO 98–BLG–35 , MACHO 99–LMC–2 and OGLE 00–BUL–12 . Photometry was derived from observational images by the MOA and OGLE groups using an image subtraction technique. For MACHO 98–BLG–35 , additional photometry derived from the MPS and PLANET groups was included. Planetary modelling of the three events was carried out in a supercluster computing environment. The estimated probability for explaining the data on MACHO 98–BLG–35 without a planet is <1 per cent. The best planetary model has a planet of mass ∼(0.4–1.5)× M |
| Keywords: | gravitational lensing planetary systems |