Ground-based Microlensing Surveys

Details Ground-based Microlensing Surveys Ground-based Microlensing Surveys

2007-04-05

arxiv.org/abs/0704.0767v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, white paper submitted to the NASA/NSF Exoplanet Task Force

Scientific paper

Microlensing is a proven extrasolar planet search method that has already yielded the detection of four exoplanets. These detections have changed our understanding of planet formation ``beyond the snowline'' by demonstrating that Neptune-mass planets with separations of several AU are common. Microlensing is sensitive to planets that are generally inaccessible to other methods, in particular cool planets at or beyond the snowline, very low-mass (i.e. terrestrial) planets, planets orbiting low-mass stars, free-floating planets, and even planets in external galaxies. Such planets can provide critical constraints on models of planet formation, and therefore the next generation of extrasolar planet searches should include an aggressive and well-funded microlensing component. When combined with the results from other complementary surveys, next generation microlensing surveys can yield an accurate and complete census of the frequency and properties of planets, and in particular low-mass terrestrial planets.

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