Searching for Extrasolar Planets in the Gravitational Microlensing Event MB10311

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2011-03

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The Ohio State University

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We analyze the microlensing event MOA-2010-BLG-311 that took place in June 2010. MOA-2010-BLG-311 has a high magnification (Amax ∼ 600) with complete data coverage over the peak, making it very sensitive to planetary signals. The lightcurve, composed of observations from twelve observatories, is fitted by a single-lens model with finite-source effect. By looking at the residuals from the fit, we find no obvious planetary signals. The result can be confirmed with additional data that is currently being processed. In general, the probability of detecting a planet strongly depends on the planet mass, the planet separation from its parent star, and the angle of the source trajectory with respect to the binary axis. By simulating lightcurves and fitting them with single lens models, we constrain the range of planets that should be detected, if present, in this event.

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Searching for Extrasolar Planets

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