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OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event

I. A. Bond·A. Udalski·M. Jaroszynski·N. J. Rattenbury·B. Paczynski·I. Soszynski·L. Wyrzykowski·M. K. Szymanski·M. Kubiak·O. Szewczyk·K. Zebrun·G. Pietrzynski·F. Abe·D. P. Bennett·S. Eguchi·Y. Furuta·J. B. Hearnshaw·K. Kamiya·P. M. Kilmartin·Y. Kurata·K. Masuda·Y. Matsubara·Y. Muraki·S. Noda·K. Okajima·T. Sako·T. Sekiguchi·D. J. Sullivan·T. Sumi·P. J. Tristram·T. Yanagisawa·P. C. M. Yock
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Abstract

We present observations of the unusual microlensing event OGLE 2003-BLG-235/MOA 2003-BLG-53. In this event a short duration (~7 days) low amplitude deviation in the light curve due a single lens profile was observed in both the MOA and OGLE survey observations. We find that the observed features of the light curve can only be reproduced using a binary microlensing model with an extreme (planetary) mass ratio of 0.0039 +/- (11, 07) for the lensing system. If the lens system comprises a main sequence primary, we infer that the secondary is a planet of about 1.5 Jupiter masses with an orbital radius of ~3 AU.

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I. A. Bond, A. Udalski, M. Jaroszynski, N. J. Rattenbury, B. Paczynski, I. Soszynski, L. Wyrzykowski, M. K. Szymanski, M. Kubiak, O. Szewczyk, K. Zebrun, G. Pietrzynski, F. Abe, D. P. Bennett, S. Eguchi, Y. Furuta, J. B. Hearnshaw, K. Kamiya, P. M. Kilmartin, Y. Kurata, K. Masuda, Y. Matsubara, Y. Muraki, S. Noda, K. Okajima, T. Sako, T. Sekiguchi, D. J. Sullivan, T. Sumi, P. J. Tristram, T. Yanagisawa, P. C. M. Yock. 2004-04-15. OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event. https://doi.org/10.1086/420928

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