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Exoplanet Occurrence Rates from Microlensing Surveys

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arxiv 2310.07502 v2 pith:6GNQ3F4G submitted 2023-10-11 astro-ph.EP astro-ph.GA

classification astro-ph.EPastro-ph.GA
keywords microlensingexoplanetsplanetsdetectedfree-floatingknowledgeoccurrenceorbiting
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 3 citations worldwide. Full citation record

  1. Disc Fragmentation. III. The need for a new paradigm for formation of planets within close binary systems

    astro-ph.EP 2026-03 conditional novelty 6.0 of 10

    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.

  2. Free Floating or Merely Detached?

    astro-ph.EP 2025-07 conditional novelty 6.0 of 10

    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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