Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-18
Astrophys.J. 616 (2004) 1204-1214
Astronomy and Astrophysics
Astrophysics
10 pages, 7 figures, accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/424988
We develop a new method of modeling microlensing events based on a Monte Carlo simulation that incorporates both a Galactic model and the constraints imposed by the observed characteristics of the event. The method provides an unbiased way to analyze the event especially when parameters are poorly constrained by the observed lightcurve. We apply this method to search for planetary companions of the lens in OGLE-2003-BLG-423, whose maximum magnification A_max=256+-43 (or A_max=400+-115 from the lightcurve data alone) is the highest among single-lens events ever recorded. The method permits us, for the first time, to place constraints directly in the planet-mass/projected-physical-separation plane rather than in the mass-ratio/Einstein-radius plane as was done previously. For example, Jupiter-mass companions of main-sequence stars at 2.5 AU are excluded with 80% efficiency.
DePoy Darren L.
Gal-Yam Avishay
Gaudi Scott B.
Gould Andrew
Han Cheongho
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