First-Ever Radio Signal Detected From a Planet Beyond Our Solar System — and It’s Coming From a Giant Aurora

Astronomers have directly detected radio emission coming from a planet outside our solar system for the first time, according to research that — if it holds up under scrutiny — opens an entirely new way of studying the hidden magnetic hearts of distant worlds. The repeating bursts of radio waves appear to come from Beta Pictoris b, a giant exoplanet sitting about 63 light-years from Earth, and they are being generated not by any signal or message, but by colossal auroras powered by a magnetic field at least 200 times stronger than Jupiter’s, the researchers say.

The discovery was described in a paper posted to the arXiv preprint platform on September 15, 2026, according to CNN. It has not yet gone through peer review — the process in which independent experts assess a research paper before it is published in a scientific journal — and that review is now underway, expected to be completed over the coming months. The research team has asked for more telescope time to keep studying the planet and to work out one of its biggest puzzles: why its magnetic field is so extraordinarily strong.

“I know radio signals are associated with searches for extraterrestrial intelligence,” said Edo Berger, a professor of astronomy at Harvard University and a co-author of the study, according to CNN. “But this is something very different.”

The signal was picked up by MeerKAT, an array of 64 radio telescope dishes in the Karoo desert of South Africa, and the detection took place across four separate observing runs conducted between February 2025 and May 2026, according to reports. The team — led by doctoral researcher Kevin Ortiz Ceballos at the Center for Astrophysics | Harvard & Smithsonian, working with researchers including Berger and Yvette Cendes alongside colleagues from the University of Oregon — recorded both steady radio emission and fast, repeating bursts at frequencies between 0.85 and 3.5 gigahertz. Crucially, those bursts were strongly circularly polarized, a classic signature of a particular kind of natural radio emission that astronomers recognize as the fingerprint of auroras.

That fingerprint has been seen before — just never on an exoplanet. This kind of emission, called auroral radio emission, is produced when charged particles spiral along magnetic field lines near a planet’s poles and release their energy as radio waves, through a process physicists call electron cyclotron maser instability. The same physics drives the northern lights on Earth and the mighty auroras of Jupiter, Saturn and other planets in our own solar system. In this case, the process is happening on a scale far beyond anything seen close to home.

“In order to see radio waves that extend all the way to the frequencies that we observed, you need an incredibly strong magnetic field,” Berger said, according to CNN. The team estimates that the magnetic field in the planet’s radio-emitting region is at least 200 times stronger than Jupiter’s. Jupiter’s own magnetic field, according to NASA, is powerful enough to generate a magnetosphere — the region of space influenced by the field — that ranks as the largest structure in our solar system, stretching up to 2 million miles (3 million kilometers) toward the Sun. Other estimates of the Beta Pictoris b field put it at around 1,250 gauss in the emission region, compared with roughly 4.3 gauss for Jupiter’s field and about 0.5 gauss for Earth’s surface field, according to reports.

The hard part of the discovery was not hearing the radio waves — it was proving where they came from. Astronomers had previously detected possible radio emissions from exoplanetary systems, but they could never rule out the possibility that the signal was actually coming from the host star rather than the planet. That ambiguity kept every earlier claim from being confirmed. In the new study, the team used distant quasars — ultra-bright cores of far-off galaxies — as fixed landmarks in their sky maps, and the emission lined up exactly with the position of planet b, not with its star, according to reports. No known physical mechanism that causes radio emission in young stars of this type can explain what was observed, the researchers wrote, which is why they are confident the source is the planet itself.

The detection story itself began almost by accident. Berger told CNN that Ortiz Ceballos came into his office one day with the result. “My graduate student Kevin was going through the data. He came into my office one day with the detection and he said, ‘I don’t think you’re going to believe this,'” Berger recalled. The team had been running what he called “a bit of a fishing expedition,” observing the system knowing they would only pick up a signal if the planet’s magnetic field was enormously strong. “This was really unexpected for us,” he said.

The surprise has a reason: until now, astronomers had assumed that if exoplanets have magnetic fields at all, they would look roughly like Jupiter’s — and that their radio emissions would therefore appear at much lower frequencies than what the team actually found. The discovery, as Berger put it, was the result of “going against the perceived wisdom in the field.”

Beta Pictoris b is a particularly well-studied world, which made the surprise bigger. Discovered in 2008, it is a young gas giant with a mass estimated at roughly 9 to 13 times that of Jupiter, and it orbits its young star at about eight times the distance between Earth and the Sun, completing one orbit roughly every 24 years, according to reports. The planetary system is extraordinarily young by cosmic standards — only about 23 million years old, compared with our own solar system’s 4.5 billion years. Its star, Beta Pictoris, is about 1.75 times as massive as the Sun and is surrounded by a giant disk of dust and debris — photographed in detail by NASA’s Hubble Space Telescope in 2015 — along with some 30 orbiting comets, according to CNN. Two more planets in the system were discovered in 2019 and 2026, known as Beta Pictoris c and Beta Pictoris d.

Scientists who were not involved in the research reacted with cautious enthusiasm. Joseph Callingham, an associate professor at the Anton Pannekoek Institute for Astronomy at the University of Amsterdam, said in an email to CNN that there had been hints of radio emissions from exoplanets before but none had been confirmed, precisely because the star could not be ruled out as the source. “What is unique for this study is that they localise the emission to the planet itself, separate from the star,” he said. Jonathan Nichols, a professor in planetary auroras at the University of Leicester in England, said in an email to CNN that if the discovery holds up under peer review, it would be “an incredibly exciting and key step forward in understanding the behavior of worlds beyond our solar system.”

Berger himself emphasized the consistency of the detection. “We recorded it multiple times, at multiple frequencies. It’s there every single time,” he told CNN — and he says he is confident about the quality of the finding, even as peer review runs its course.

Analysis: Why It Matters

This is the kind of discovery whose importance is easy to miss behind the headline. On the surface it sounds simple — scientists heard radio noise from a faraway planet — but what was actually detected is a planetary magnetic field, measured from 63 light-years away, on a world no telescope will ever resolve as more than a point of light. That is a remarkable thing, and it matters for reasons that go well beyond this one gas giant.

For most of human history, astronomy has been the study of light. Telescopes collect light in its many forms — visible, infrared, radio — and from it, astronomers infer temperature, composition, distance and motion. But light has a built-in limitation: it tells us about the surfaces and atmospheres of things, not about their interiors. A planet’s magnetic field, by contrast, is generated deep inside, by the churning of electrically conducting material — molten iron in Earth’s outer core, metallic hydrogen in Jupiter’s interior. It is the most direct remote probe we have of what is happening inside a planet. A magnetic field strong enough to announce itself in radio waves is, in effect, the planet’s interior shouting across interstellar space.

That is why this result, if confirmed, is not really about Beta Pictoris b at all. It is about the technique. Once radio detection of exoplanetary auroras is an established tool, it can be aimed at other systems — including, eventually, smaller rocky planets. And magnetic fields are not a curiosity; they are central to the question of whether a world can support life. Earth’s magnetic field acts as a shield, deflecting the solar wind’s stream of charged particles that would otherwise strip the atmosphere away into space. This is not speculation: Mars, which lost its global magnetic field billions of years ago, had its atmosphere largely eroded away by the solar wind, leaving the thin, cold air it has today. A magnetic field is, in a real sense, part of a planet’s life-support system. A radio telescope that can measure an exoplanet’s magnetic field is therefore, at one remove, a habitability instrument. Today the method has been demonstrated on a giant; tomorrow, with more sensitive instruments like the Square Kilometre Array coming online, it may be aimed at rocky worlds in the habitable zones of their stars.

The youth of the Beta Pictoris system adds a second layer of interest. At 23 million years old, this system is a baby — a snapshot of what our own solar system may have looked like when its planets were still glowing with the heat of formation and their magnetic fields were possibly at their most violent. Dynamo theory, the physics that explains how planetary magnetic fields are generated, was built from observations of just eight planets and a handful of moons. Every one of those is old and relatively quiet. Beta Pictoris b gives theorists something they have never had: a young, massive, fast-spinning gas giant with a measured field enormously stronger than Jupiter’s. Why is it so strong? Is it the planet’s youth, its rapid rotation, its mass, or some combination that has not been imagined yet? Berger told CNN he expects the question to “occupy people for a while.” That is science-speak for: our models are about to be tested hard, and that is a good thing.

There is also a lesson in the story of the discovery itself, and it is worth stating plainly: the finding came from defying a field’s shared assumption. Astronomers had collectively decided that exoplanet magnetic fields would behave like Jupiter’s, and so most searches looked for radio emission at Jupiter-like low frequencies. The Beta Pictoris b signal was at higher frequencies precisely because the field is far stronger than Jupiter’s — which is exactly what the consensus said not to expect. Progress here did not come from better instruments alone; it came from a willingness to run a “fishing expedition” on a premise the field considered unlikely. That kind of contrarian observation is how surprises get found.

A note of necessary caution belongs here too, and the researchers themselves have offered it: this is a preprint, not yet peer-reviewed. The history of astronomy includes radio signals that turned out to be something else — instrument artifacts, stellar flares mistaken for planets, and at least one famous case of a microwave oven. The team has addressed the obvious alternatives: multiple detections at multiple frequencies, precise localization against the star using quasar reference points, and a physical explanation — auroral emission — that fits the signal’s polarization and frequency structure. Independent experts, from Amsterdam to Leicester, have called the result exciting while urging exactly the right posture: wait for peer review. The caution is not a flaw in the story; it is the scientific method working as designed.

What to watch next is straightforward. First, the peer review of the paper over the coming months — confirmation would cement this as a landmark in exoplanet science. Second, the team’s request for more telescope time: follow-up observations will refine the field measurement and test whether the bursts repeat with the planet’s rotation, which would tighten the magnetic-field estimate further. Third, replication on other young giant planets — if Beta Pictoris b’s giant field is typical of young gas giants rather than an oddity, dynamo theory will need a substantial rewrite. And finally, the long game: the Square Kilometre Array and its successors pushing this technique down to ever smaller planets. A century ago, astronomers argued about whether other solar systems existed at all. Today they number in the thousands. Now, for the first time, we can hear their magnetic fields.

Sources

• CNN — Radio signal detected for the first time from a planet outside our solar system (October 2, 2026)
• New York Post — Researchers detect a direct radio signal from planet beyond solar system for the first time (September 26, 2026)
• The paper described in this article was posted as a preprint to arXiv on September 15, 2026, and is awaiting peer-reviewed publication.