Seminar

Results from the OGLE-MOA-WISE Microlensing Survey

The discovery of thousands of extrasolar planets ranks among the most exciting scientific developments of the past decade. Among the techniques currently used to discover extrasolar planets, microlensing has some unique capabilities. It is the most sensitive technique to detect planets beyond the "snowline," where gas and ice giants are likely to form. Starting April 2011, we have begun a "second generation" microlensing survey, combining OGLE, MOA, and the WISE observatory. I will present a preliminary statistical analysis for the first three seasons of the survey. Over 10% of the events that were observed by all three sites showed a deviation from a single-lens microlensing, and for almost 1/3 of those the anomaly might be explained by a planetary companion. By accounting for our detection efficiency, we find a ~20-25% planetary system abundance, which is in line with previous microlensing estimates. Moreover, our results suggests that massive planets around low-mass stars are common, which may be in conflict with planetary formation scenarios. The data also can set constraints on the multiplicity fraction and the binary mass ratio distribution.

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