At the end of September 2026, astronomers announced an event that had long remained only a theoretical possibility. Using the South African radio telescope MeerKAT, they managed for the first time to confidently detect radio emission coming directly from an exoplanet rather than from its star. The source was the young gas giant Beta Pictoris b, located roughly 63–64 light-years from Earth.
A team led by Kevin Ortiz Ceballos of the Harvard-Smithsonian Center for Astrophysics, together with colleagues Edo Berger and Yvette Cendes, observed the Beta Pictoris system four times in 2025 and 2026. The instrument operated in the 0,85–3,5 GHz bands. A radio source was registered in each session. But the decisive factor was pinpointing its position precisely. Using distant quasars as reference points, the researchers aligned the radio images with the known coordinates of the system's objects. The signal coincided with the position of planet b and proved incompatible with the star at the level of 4,4 sigma and with planet c at 4,8 sigma.
The emission consisted of rapid repeating bursts with high circular polarization — from 40 to 70 percent — as well as fainter steady emission between them. This combination is characteristic of electron-cyclotron maser emission, which arises in auroral regions. Charged particles, accelerating along the field lines of the planet's powerful magnetic field, generate radio waves. The maximum recorded frequency of about 3,5 GHz indicates a field strength of at least 1,25 kilogauss in the emission zone. This is the first direct measurement of an exoplanet's magnetic field. For comparison: Earth's surface field is about 0,5 gauss, while Jupiter's is around 4 gauss.
Beta Pictoris b is a massive world, 10–12 times heavier than Jupiter, with a rotation period of only 8–9 hours. The planet is young, and its strong magnetic field agrees well with theoretical dynamo models for such objects. The system's star is relatively quiet in the radio range, which helped separate the planet's signal. The work is still at the peer-review stage, and the results have been published as a preprint on arXiv.
This discovery has nothing to do with the search for extraterrestrial civilizations — the signals are entirely natural. However, it provides a new tool. Planetary magnetic fields influence atmospheric retention, interaction with the stellar wind, and internal structure. Until now, such measurements for worlds beyond the Solar System were not directly accessible. Now there is an opportunity to study exoplanetary magnetospheres through their radio flares.
Imagine: tens of light-years away, a huge ball of gas is rotating. In its polar regions, processes rage similar to Earth's northern lights, only incomparably more powerful. Electrons spiral along invisible field lines, and energy escapes into space as radio waves. These waves cross interstellar space, reach Earth, and are caught by a network of antennas in the deserts of South Africa. All of this is part of the same physics that operates both here, with us, and there, at a distant star. The Universe turns out to be arranged so that even the most distant objects leave traces that we are gradually learning to read. Each such trace adds detail to a picture of the world where planets, magnetic fields, and radiation are bound into a single complex yet comprehensible system.
