Original title: Discovery of radio emission from the exoplanet $β$ Pictoris b
Kevin N. Ortiz Ceballos, Edo Berger, Yvette Cendes · September 2026
Magnetic fields protect a planet's atmosphere from space winds and reveal what lies deep inside its core. Until now, scientists could never directly measure magnetic field strengths for planets outside our Solar System. To solve this, researchers used the MeerKAT telescope array to listen for radio waves from the giant alien world β Pictoris b. They looked for auroral radio emissions, which are natural radio signals produced when moving electrons spiral through strong magnetic fields. The highest frequency of these radio waves tells you how powerful the magnetic field is. The team detected recurring radio bursts alongside steady signals. This revealed that β Pictoris b has a magnetic field of at least 1.25 kG, marking the first direct measurement of its kind.
Imagine trying to hear a specific conversation in a crowded party. Normally, the background chatter drowns out individual voices. Now suppose one person speaks in a unique pitch that cuts through the noise. In this paper, the planet's radio emission has a unique circular polarization that allows the telescope to distinguish it from the star's emission, enabling the first detection.
This detection opens a new window for studying exoplanets. Measuring magnetic fields tells us about a planet's interior structure and its ability to shield an atmosphere from stellar winds. It could help identify which exoplanets might be habitable.
The detection is limited to a single giant planet with strong magnetic activity. The method requires a bright, nearby exoplanet and sensitive radio telescopes. The magnetic field strength is a lower limit; the actual field could be stronger. The emission mechanism is inferred but not directly confirmed.
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Discovery of radio emission from the exoplanet $β$ Pictoris b — Kevin N. Ortiz Ceballos, Edo Berger, Yvette Cendes
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.