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The Impact of Stellar Activity on the Detection and Characterization of Exoplanets

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Handbook of Exoplanets

Abstract

At the level of a stellar photosphere, stellar magnetic fields manifest themselves as the stellar equivalents of sunspots and faculae. The dark, localized spots give rise to a rotationally modulated background signal that both increases the fractional depth of exoplanet transits and increases the variability of the background against which they are detected. The convective motions of the electrically conducting photospheric gas are inhibited in spots and in facular regions, again producing rotationally modulated variability in spectral line shapes as the star rotates. Here I discuss the physical phenomena that give rise to these forms of variability, their impact on the detection and characterization of extrasolar planets, and proxy indicators and observing strategies that can mitigate this impact.

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Author information

Authors and Affiliations

  1. Centre for Exoplanet Science, SUPA School of Physics and Astronomy, University of St Andrews, St Andrews, UK

    Andrew Collier Cameron

Authors
  1. Andrew Collier Cameron
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Correspondence to Andrew Collier Cameron .

Editor information

Editors and Affiliations

  1. Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain

    Hans J. Deeg

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

    Juan Antonio Belmonte

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Cameron, A.C. (2018). The Impact of Stellar Activity on the Detection and Characterization of Exoplanets. In: Deeg, H., Belmonte, J. (eds) Handbook of Exoplanets . Springer, Cham. https://doi.org/10.1007/978-3-319-55333-7_23

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