Astronomers using South Africa’s MeerKAT radio telescope array have directly detected radio emissions from Beta Pictoris b. This marks the first time radio signals have been confirmed as coming directly from an exoplanet rather than its host star. The international research team, featuring scientists from the Center for Astrophysics | Harvard & Smithsonian and the University of Oregon, announced the milestone breakthrough, shedding new light on planetary magnetic fields and extrasolar space weather.
Located roughly 63 light-years from Earth in the constellation Pictor, Beta Pictoris b is a young gas giant approximately 23 million years old. The massive planet possesses between 9 and 13 times the mass of Jupiter and orbits its magnetically quiet host star-an A6V star named Beta Pictoris-at eight times the Earth-Sun distance. The star system also hosts two other known planets, Beta Pictoris c and Beta Pictoris d.
Unlocking the Mystery of Exoplanet Auroras
For decades, researchers searched for radio waves from worlds beyond our Solar System, but previous detections could never be unambiguously separated from stellar activity. To solve this hurdle during observations conducted across four separate occasions in 2025 and 2026, the team used super-bright galaxy cores called quasars as reference points in their sky mapping. This technique allowed them to isolate the signal with a high degree of certainty.
The research team identified rapid, recurring, and strongly circularly polarized radio bursts, along with persistent emissions at frequencies ranging from 0.85 to 3.5 GHz. According to the study, these characteristics point directly to a physical process known as electron cyclotron maser instability (ECMI). This magnetosphere-ionosphere coupling process is the exact same mechanism that produces brilliant auroral radio emissions on Jupiter, Earth, and other planets within our own Solar System.
“Although auroral radio bursts are observed in Solar System planets and in some ultracool dwarfs, no radio detection has previously been unambiguously localized to an extrasolar planet rather than its host star,” the researchers noted in their study paper.
Direct Measurement of an Exoplanet’s Magnetic Field
Because auroral radio frequencies are directly tied to the magnetic field strength at their source, the detection provided scientists with a rare opportunity. A burst observed up to 3.5 GHz implies a localized magnetic field of at least 1.25 kilogauss-more than 1,000 gauss. In stark contrast, Earth’s magnetic field measures roughly half a gauss.
This milestone represents the first direct measurement of magnetic-field strength for an extrasolar planet. The massive strength of Beta Pictoris b’s field aligns closely with dynamo-scaling predictions for young, heavy giant planets. , the planet’s rapid rotation-completing a full spin in roughly 8 to 9 hours-likely plays a vital role in powering its intense auroral radio emissions.
Expanding Future Exoplanet Searches
While the findings remain preliminary pending formal peer review after being shared on arXiv on September 15, 2026, the astronomical community has greeted the discovery with widespread enthusiasm. Researchers are already looking ahead to apply this observational method to other targets. The team estimates that a five- to sevenfold improvement in instrument sensitivity from next-generation radio observatories will bring additional giant exoplanets across nearby star systems within reach of detection, ushering in a brand-new era of exoplanet meteorology and magnetosphere studies.
Frequently Asked Questions
Is the radio signal from Beta Pictoris b a sign of alien life?
No. While public interest often jumps to extraterrestrial communications when hearing about exoplanet radio signals, scientists have confirmed the emissions originate entirely from natural auroras-similar to the northern and southern lights on Earth and Jupiter-powered by electron cyclotron maser instability.
How far away is Beta Pictoris b from Earth?
Beta Pictoris b is located approximately 63 to 64 light-years away from Earth in the constellation Pictor.
What telescope was used to make this discovery?
The breakthrough detection was made using the MeerKAT radio telescope array, which is located in South Africa.
How strong is the magnetic field of Beta Pictoris b?
Data indicates that Beta Pictoris b possesses an immensely powerful magnetic field exceeding 1,000 gauss (or at least 1.25 kilogauss at the emission source), which is thousands of times stronger than Earth’s magnetic field.
Why was it so difficult to detect radio waves from exoplanets previously?
Previously, scientists struggled to separate planetary radio emissions from the intense radio noise produced by host stars. The research team overcame this by utilizing distant quasars as reference points on sky maps to unambiguously trace the signals directly to planet b.
