Radio Armor: Detecting a Magnetic Shield on YZ Ceti b

Scientists using the VLA detected strongly polarized, repeating radio bursts synchronized with the 2-day orbit of rocky YZ Ceti b, revealing a planetary magnetic field via star-planet interactions. This first direct hint of a magnetosphere around a terrestrial exoplanet 12 light-years away offers a powerful tool to assess atmospheric retention and habitability around active red dwarfs, and marks a major leap in how we search for long-term planetary survival beyond the habitable zone. We unpack the physics of star-planet interaction, why polarized radio light signals a magnetosphere, and what this means for future exoplanet magnetic studies.

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