Tag: exoplanet

Prince Mario-Max Schaumburg-Lippe: First Radio Signal Detected Directly From an Exoplanet

Somewhere 63 light-years from Earth, a giant planet is putting on a light show so powerful we can hear it. Astronomers have, for the first time, traced a radio signal directly to an exoplanet rather than its star: repeating bursts of auroral radio emission from Beta Pictoris b, a gas giant roughly a dozen times Jupiter’s mass. The detection, made with South Africa’s MeerKAT radio telescope array, was reported this week and is already being called a landmark in observational astronomy.

How they caught it

Finding radio waves from an exoplanet is a needle-in-a-haystack problem with a twist: the needle and the haystack both glow. Stars are loud in radio. The team, led by graduate student Kevin Ortiz Ceballos of the Center for Astrophysics (Harvard and Smithsonian) with colleagues at the University of Oregon, had to prove the bursts came from the planet and not from Beta Pictoris itself.

Their calibration trick was elegant. Across four observing sessions in 2025 and 2026, they lined up their radio images against distant quasars, objects so far away they barely appear to move, using them as fixed pins on the sky. With that grid in place, the emission sat squarely on the planet. The signal carried strong circular polarization, the calling card of electron cyclotron maser emission, the same physics behind auroral radio bursts at Jupiter, Saturn, and Earth. In plain terms: this is a northern-lights broadcast from another world.

A magnetic field, measured from 63 light-years away

Here is the part that made astronomers sit up. The highest-frequency emission the team recorded implies a magnetic field of at least 1,250 gauss at the emitting region. Earth’s surface field is about half a gauss. Jupiter, the heavyweight of our solar system, tops out around 4 to 14 gauss depending on where you measure. Beta Pictoris b dwarfs them both by a staggering margin.

That number matters because magnetic fields are planetary armor. They deflect the charged particle streams pouring off a star, shielding the atmosphere from being stripped away over billions of years. When astronomers eventually hunt for habitable worlds, a magnetic field reading could become one of the first boxes they check. This is the first time anyone has measured one directly on a planet beyond our solar system.

The system itself is a beauty: Beta Pictoris b is only about 23 million years old, a baby by cosmic standards, still warm from its formation. The star hosts at least two more planets and a broad disk of gas and dust that may one day settle into a Kuiper Belt of its own. Its star is magnetically quiet, which is precisely what made the planet’s own signal stand out.

A fair note on the science

The paper has not yet completed peer review; it was posted as a preprint on September 15. That is worth saying plainly. Preprints are how fast-moving astronomy works these days, but the findings will face scrutiny before they enter the textbooks. The team’s calibration against quasars and the four separate observing sessions give the result real weight, and independent teams will surely try to reproduce it with other arrays.

What this unlocks

The practical payoff goes beyond one planet. If auroral radio emission can be picked up across dozens of light-years, astronomers suddenly have a new way to take a distant world’s vital signs. Magnetic fields, rotation periods, even hints about atmospheric composition could, in principle, be read from the radio dial. Teams are already talking about aiming the same technique at other young, massive exoplanets, and at the ultracool dwarf stars that sit on the blurry line between stars and planets.

There is a broader lesson in the method, too. The detection hinged on patience: four observing sessions spread across two years, and a calibration scheme clever enough to tell planet from star. Breakthroughs in astronomy increasingly look like this, not a single eureka night but a slow accumulation of careful measurements until the signal stands up and introduces itself.

Why this one feels different

Astronomy has given us a decade of firsts: first image of a black hole’s shadow, first gravitational waves, first atmospheric chemistry on distant worlds. But there is something unusually intimate about this one. We are not looking at Beta Pictoris b. We are listening to it. A magnetosphere flexing, auroras crackling at the poles of a world no human will ever visit, and the physics is the same physics that paints green curtains across Arctic skies. Stand under a dark sky sometime this fall (the city’s holiday lights season is about to begin, and Radio City’s own light show returns before long, but the real show is the one that never turns off) and remember: the universe is humming. Now, for the first time, we’ve picked out one voice in the choir and traced it home.

Prince Mario-Max Schaumburg-Lippe: Lava World HD 3167 b Keeps a Surprising Atmosphere

There is a planet 154 light-years away, in the constellation Pisces, where a year lasts a single Earth day. Its surface is hot enough to melt rock. By every rule astronomers thought they knew, it should be a naked ball of magma — any atmosphere long since blasted away by stellar wind and high-energy radiation.

It has an atmosphere anyway.

The planet is HD 3167 b, a rocky super-Earth orbiting a K-type star so closely that it completes a full lap in about 24 hours. And according to new research trending through the science press on September 30, it is now the coldest lava world found to date with evidence of an atmosphere. “Coldest” is doing a lot of heavy lifting in that sentence — this is still a world of molten rock — but in the physics of atmospheres, relative cold changes everything. Or so we thought. HD 3167 b just voted otherwise.

How do you weigh air on a world of lava?

You cannot exactly send a weather balloon. The team used the James Webb Space Telescope and a technique called the secondary eclipse method: they measured the tiny dip in light when the planet slips behind its star, disappearing from view. By comparing the system’s brightness with and without the planet’s contribution, astronomers can work out how hot the planet’s day side is.

Here is the part that made researchers sit up: the day side was cooler than expected. On an airless rock, heat has nowhere to go — the day side broils while the night side freezes. But HD 3167 b’s dayside temperature suggested heat was being carried around to the night side. Something was moving that heat. The best explanation, and the one the team landed on, is an atmosphere redistributing warmth around the globe — the same kind of heat-spreading blanket effect we see on Venus.

The study was led by University of Chicago graduate student Brandon Park Coy, working with Edwin Kite, and published in The Astrophysical Journal Letters. It is the first result from a broader program led by Megan Weiner Mansfield of the University of Maryland, which is surveying ten ultra-hot lava worlds. One world in, and the survey has already broken a record. Not a bad start.

Why this one matters more than most

Of the more than 6,300 exoplanets catalogued so far, only a handful are rocky worlds with evidence of atmospheres. Gas giants are easy to study; small rocky planets are faint, their atmospheres whisper-thin against the glare of their stars. Every confirmed rocky atmosphere is precious data.

But HD 3167 b carries an extra layer of meaning, and it is the one Coy himself highlighted: “We’re interested in studying these kinds of planets because we think early Earth might have looked a lot like a lava world.”

Read that again. Four and a half billion years ago, our own planet may have been a magma-ocean world not unlike HD 3167 b — and yet here we are, with oceans, forests, and someone writing about it on a Wednesday morning. Understanding how a lava world can cling to an atmosphere is, in a very real sense, studying the opening chapter of our own story. The question is not just “what is that planet like?” It is “how did a place like that become a place like this?”

That is the quiet thrill running underneath the exoplanet field right now. Each of these scorched rocks is a time machine pointed at Earth’s infancy.

What comes next

The Mansfield survey still has nine lava worlds to go, and HD 3167 b has set the tone: expect surprises. A few things to watch:

Confirmation and composition. “Evidence of an atmosphere” is the careful phrasing of good science. Follow-up observations will try to pin down what that atmosphere is actually made of — and how thick it is. Different gases tell different stories about where the air came from: outgassed from the interior, or delivered from elsewhere.

The wind-stripping puzzle. Close-orbiting rocky planets face a brutal environment. Stellar wind and high-energy photons should strip atmospheres fast. HD 3167 b is holding on anyway, which means our models of atmospheric escape need updating — or the planet has a way of replenishing its air that we have not figured out yet. Either answer is interesting.

The early-Earth connection. Every lava world with an atmosphere is another data point for models of how Earth kept its own air through the magma-ocean era. The same spirit of patient, ambitious engineering that is teaching aircraft to fly themselves past highway traffic is at work here — except the vehicle is a space telescope, and the destination is deep time.

There is something deeply optimistic about this kind of discovery. The universe keeps handing us worlds that should not exist according to the old rules, and each one forces the rules to get better. HD 3167 b is 154 light-years of molten rock with a wisp of atmosphere it has no business keeping — and it may be holding a mirror up to the planet we live on.

Not bad for a Wednesday. It has been a week for looking up — whether at the future of flight over New York or at a lava world 154 light-years out — and the view keeps getting better.