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Finding Planets via Gravitational Microlensing

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Abstract

Gravitational microlensing is a technique to probe compact objects toward the center of the galaxy, such as distant stars, planets, white and brown dwarfs, black holes, and neutron stars. Since the first microlensing planet discovered in 2003, more than 40 planets have been detected with this technique, as well as several black hole candidates, and a population of potential free-floating planets. This chapter first provides a presentation of the microlensing theory, including numerical aspects to solve binary and triple lens problems, and a discussion of the microlensing planetary detection efficiency, with a high potential regarding cold planets beyond the snow line. It also explains how the planetary characterization can be facilitated when the microlensing light curves exhibit distortions due to second-order effects, such as parallax, planetary orbital motion, and extended source, and how they can also introduce degeneracies in the models. The chapter then reviews the main discoveries to date and the recent statistical results from high-cadence ground-based surveys and space-based observations, especially on the planet mass function and the distance distribution of the microlensing planetary systems. Finally, future prospects are discussed, with the expected advances from dedicated space missions, extending the planet sensitivity range down to Mercury masses.

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Authors and Affiliations

  1. Institut d’astrophysique de Paris, 75014, 98bis boulevard Arago, Paris, France

    Virginie Batista

  2. Centre National d’Etudes Spatiales, 75039, 2 place Maurice Quentin, Paris Cedex 1, France

    Virginie Batista

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  1. Virginie Batista
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  1. Instituto de Astrofísica de Canarias , La Laguna, Spain

    Hans J. Deeg

  2. Instituto de Astrofísica de Canarias, La Laguna, Spain

    Juan Antonio Belmonte

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  1. Department of Astronomy &Astrophysics and Center for Exoplanets &Habitable Worlds, The Pennsylvania State University, 525 Davey Lab, 16802, University Park, PA, USA

    Alexander Wolszczan

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Batista, V. (2018). Finding Planets via Gravitational Microlensing. In: Deeg, H., Belmonte, J. (eds) Handbook of Exoplanets . Springer, Cham. https://doi.org/10.1007/978-3-319-30648-3_120-2

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    Finding Planets via Gravitational Microlensing
    Published:
    15 December 2017

    DOI: https://doi.org/10.1007/978-3-319-30648-3_120-2

  2. Original

    Finding Planets via Gravitational Microlensing
    Published:
    13 October 2017

    DOI: https://doi.org/10.1007/978-3-319-30648-3_120-1

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