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

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

2004-04-15

arxiv.org/abs/astro-ph/0404309v1

Astrophys.J.606:L155-L158,2004

Astronomy and Astrophysics

Astrophysics

13 pages, 3 colour figures. To appear in Astrophysical Journal Letters (May 2004)

Scientific paper

10.1086/420928

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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