Microlensing Surveys for Exoplanet Research (MOA)
The first 22 years of a search for exoplanets by gravitational microlensing that is being conducted by the Japan/NZ collaboration known as MOA are described. A range of techniques that was developed in association with other international collaborations is outlined, and these are typified by a chronological sequence of examples from the published literature. The detection of exoplanets in gravitational microlensing events of high and moderately high magnification is emphasized. Physical descriptions of these processes are given. Evidence for free-floating planets is also presented, and recent results on the mass-radius distribution of planets and on the planetary mass-function are given. Current plans for the near-term future of the international microlensing community are described, and also for the more distant future. The latter includes a survey of exoplanets that will be conducted by the WFIRST space telescope in the coming decade. Brief remarks are also made on early and current searches for dark matter by MOA.
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