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Title:
OGLE 2003-BLG-235/MOA 2003-BLG-53: A Planetary Microlensing Event
Authors:
Bond, I. A.; Udalski, A.; Jaroszyński, M.; Rattenbury, N. J.; Paczyński, B.; Soszyński, I.; Wyrzykowski, L.; Szymański, M. K.; Kubiak, M.; Szewczyk, O.; Żebruń, K.; Pietrzyński, G.; Abe, F.; Bennett, D. P.; Eguchi, S.; Furuta, Y.; Hearnshaw, J. B.; Kamiya, K.; Kilmartin, P. M.; Kurata, Y.; Masuda, K.; Matsubara, Y.; Muraki, Y.; Noda, S.; Okajima, K.; Sako, T.; Sekiguchi, T.; Sullivan, D. J.; Sumi, T.; Tristram, P. J.; Yanagisawa, T.; Yock, P. C. M.
Affiliation:
AA(Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK; .), AB(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; ), AC(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; ; Department of Astrophysical Sciences, Princeton University, Peyton Hall, Ivy Lane, Princeton NJ 08544-1001), AD(Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand; ), AE(Department of Astrophysical Sciences, Princeton University, Peyton Hall, Ivy Lane, Princeton NJ 08544-1001 ), AF(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; ), AG(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; ), AH(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; ), AI(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; ), AJ(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; ; Department of Astrophysical Sciences, Princeton University, Peyton Hall, Ivy Lane, Princeton NJ 08544-1001), AK(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; ), AL(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland; .; Universidad de Concepcion, Departmento de Física, Casilla 160-C, Concepcion, Chile.), AM(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AN(Department of Physics, University of Notre Dame, 225 Niewland Science Hall, Notre Dame, IN 46556; .), AO(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AP(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AQ(Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; ), AR(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AS(Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; .), AT(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AU(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AV(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AW(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AX(National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan; .), AY(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; ), AZ(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; .), BA(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan; , , , , , , , , , .), BB(School of Chemical and Physical Sciences, Victoria University, P.O. Box 600, Wellington, New Zealand; .), BC(Department of Astrophysical Sciences, Princeton University, Peyton Hall, Ivy Lane, Princeton NJ 08544-1001 , .), BD(Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand; ), BE(National Aerospace Laboratory, Jindaiji 7-44-1, Chofu, Tokyo 182-8522, Japan; .), BF(Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand; .)
Publication:
The Astrophysical Journal, Volume 606, Issue 2, pp. L155-L158. (ApJL Homepage)
Publication Date:
05/2004
Origin:
UCP
ApJ Keywords:
Cosmology: Gravitational Lensing, Stars: Planetary Systems, Stars: Individual: Alphanumeric: MOA 2003-BLG-53, Stars: Individual: Alphanumeric: OGLE 2003-BLG-235
DOI:
10.1086/420928
Bibliographic Code:
2004ApJ...606L.155B

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 to a single-lens profile was observed in both the MOA (Microlensing Observations in Astrophysics) and OGLE (Optical Gravitational Lensing Experiment) 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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