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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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EXOPLANET MODULATION OF STELLAR CORONAL RADIO EMISSION.

Offr Cohen1, Sofia-Paraskevi Moschou2, Alex Glocer3

  • 1Lowell Center for Space Science and Technology, University of Massachusetts Lowell 600 Suffolk St., Lowell, MA 01854, USA.

The Astronomical Journal
|January 29, 2021
PubMed
Summary
This summary is machine-generated.

We developed a new tool to predict exoplanet radio emissions from stellar wind interactions. This tool reveals significant radio modulations, suggesting exoplanet radio signatures may extend beyond low frequencies.

Keywords:
planet-star interactionsplanets and satellites: magnetic fieldsplasmasradio continuum: planetary systemsstars: magnetic field

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Area of Science:

  • Astronomy and Astrophysics
  • Planetary Science

Background:

  • Exoplanet detection traditionally focuses on auroral radio emissions from planet-stellar wind interactions.
  • Predicting ambient coronal radio emission and its modulations by exoplanets is crucial for broader detection strategies.

Purpose of the Study:

  • To introduce a new tool for predicting radio emission modulations induced by exoplanets.
  • To explore the parameter space influencing these radio modulations.

Main Methods:

  • Utilized a Magnetohydrodynamics (MHD) stellar corona model with a new radio prediction tool.
  • Simulated idealized cases varying planetary magnetic field strength and polarity, orbital separation, and stellar field strength.

Main Results:

  • Significant radio flux modulations (up to 100%) predicted for hot Jupiters in the 10-100 MHz range.
  • Observable modulations (2-10%) also predicted at higher frequencies (>250 MHz).
  • Modulation intensity is sensitive to planetary magnetic field polarity and stellar magnetic field strength.

Conclusions:

  • Exoplanet radio signatures may be detectable at frequencies higher than previously thought.
  • The new tool can predict observable modulation frequencies for current radio facilities.
  • This work expands the potential for exoplanet detection via radio astronomy.