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Exoplanet Occurrence Rates from Microlensing Surveys
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The number of exoplanets detected using gravitational microlensing technique is currently larger than 200, which enables population studies. Microlensing is uniquely sensitive to low-mass planets orbiting at separations of several astronomical units, a parameter space that is not accessible to other planet-detection techniques, as well as free-floating planets, not orbiting around any star. In this review, we present the state-of-the-art knowledge on the demographics of exoplanets detected with microlensing, with a particular emphasis on their occurrence rates. We also summarize the current knowledge about free-floating planets, an elusive population of objects that seem to be more common than ordinary, gravitationally bound exoplanets.
Forward citations
Cited by 2 Pith papers
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Disc Fragmentation. III. The need for a new paradigm for formation of planets within close binary systems
Planets in tight binaries may form by gravitational fragmentation of a massive disc before the secondary star forms; massive, early-formed planets survive as S-types, low-mass planets are ejected as free-floating planets.
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Free Floating or Merely Detached?
Planet-planet scattering can leave 'detached' planets at hundreds of AU, and these may account for about half of the free-floating Neptunes detected by microlensing.
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