First Radio Signals Detected from Exoplanet β Pictoris b

Astronomers have announced the first direct detection of radio emissions from an exoplanet, the gas giant β Pictoris b orbiting the young star β Pictoris. Using the Atacama Large Millimeter/submillimeter Array (ALMA) and the Very Large Array (VLA), the team captured faint radio waves that are believed to originate from the planet’s magnetosphere interacting with stellar winds. The signal, measured at frequencies around 10 GHz, matches theoretical predictions for auroral radio emission from a planet with a strong magnetic field.

The discovery marks a milestone in exoplanet studies, providing a new probe of planetary magnetic fields, atmospheric composition, and star–planet interactions. β Pictoris b is a young, roughly 13‑Jupiter‑mass planet located about 63 light‑years from Earth; its rapid rotation and intense magnetic field are thought to generate the observed radio waves. By comparing the radio spectrum with models, researchers can infer the planet’s magnetic field strength and the density of its upper atmosphere, offering insights into the planet’s internal structure and evolution.

This first radio detection opens a new observational window for studying exoplanets beyond optical and infrared techniques. Future observations with next‑generation radio telescopes could survey a broader population of gas giants, helping to map magnetic environments and assess their potential influence on planetary habitability and atmospheric dynamics.