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Stellar Wind and the Efficiency of Plasma Radio Emission from Exoplanets

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Abstract

We present the results of our study of the influence of stellar activity on the efficiency of the plasma radio emission generation mechanism and the properties of this emission in the atmospheres of exoplanets with a weak magnetic field. The plasma generation mechanism can be efficiently realized in the case where the Langmuir frequency exceeds the electron gyrofrequency, and the electron cyclotron maser is inefficient. This mechanism, which depends significantly on plasma parameters, suggests the generation of plasma (quasi-static) waves by energetic electrons followed by their conversion into electromagnetic radiation. The stellar wind, depending on its intensity, can modify significantly the plasmasphere of an exoplanet and change its parameters. Using the interaction of the exoplanet HD 189733b with a stellar wind of various intensities from the central star as an example, we show that the plasma mechanism can be realized at any stellar wind intensity, only the requirements for the parameters of the plasma mechanism change. In particular, the plasma wave energy density needed to generate a radio flux accessible to detection by modern radio-astronomical means changes, and its frequency range changes. The latter will allow the detected radio emission to be used as an indicator of the activity of the parent star.

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Funding

The study was supported by the Russian Science Foundation (project no. 23-22-00014).

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Authors and Affiliations

  1. Institute of Applied Physics, Russian Academy of Sciences, 603950, Nizhny Novgorod, Russia

    V. V. Zaitsev & V. E. Shaposhnikov

  2. High School of Economics, National Research University, Nizhny Novgorod Branch, Nizhny Novgorod, Russia

    V. E. Shaposhnikov

  3. Space Research Institute, Austrian Academy of Sciences, Graz, Austria

    M. L. Khodachenko

  4. Institute of Laser Physics, Russian Academy of Sciences, Siberian Branch, Novosibirsk, Russia

    M. S. Rumenskikh

  5. Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Russia

    M. S. Rumenskikh

Authors
  1. V. V. Zaitsev
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  2. V. E. Shaposhnikov
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  3. M. L. Khodachenko
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  4. M. S. Rumenskikh
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Corresponding author

Correspondence to V. E. Shaposhnikov.

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Translated by V. Astakhov

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Zaitsev, V.V., Shaposhnikov, V.E., Khodachenko, M.L. et al. Stellar Wind and the Efficiency of Plasma Radio Emission from Exoplanets. Astron. Lett. 50, 81–91 (2024). https://doi.org/10.1134/S1063773724600188

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  • DOI: https://doi.org/10.1134/S1063773724600188

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