Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-10
Astronomy and Astrophysics
Astrophysics
12 pages, 2 figures, to appear in "Extreme Solar Systems," ASP Conference Series, ed. Debra Fischer, Fred Rasio, Steve Thorset
Scientific paper
Microlensing is potentially sensitive to multiple-planet systems containing analogs of all the solar system planets except Mercury, as well as to free floating planets. I review the landscape of microlensing planet searches, beginning with an outline of the method itself, and continuing with an overview of the results that have been obtained to date. Four planets have been detected with microlensing. I discuss what these detections have taught us about the frequency of terrestrial and giant planets with separations beyond the ``snow line.'' I then discuss the near and long-term prospects for microlensing planet searches, and in particular speculate on the expected returns of next-generation microlensing experiments both from the ground and from space. 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 essentially all planets with masses greater than that of Mars.
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