How did a planet this big form around a star this small?

The host star, TOI-6894, is a red dwarf with only 20% the mass of the Sun, typical of the most common stars in our galaxy. Until now, such low-mass stars were not thought capable of forming or retaining giant planets. But as published recently in Nature Astronomy, the unmistakable signature of a giant planet — TOI-6894b — has been detected in orbit around this tiny star.

This exceptional system was first identified in data from NASA’s Transiting Exoplanet Survey Satellite (TESS), as part of a large search for giant planets around small stars, led by Dr. Edward Bryant from UCL’s Mullard Space Science Laboratory.

The planetary nature of the signal was then confirmed by an extensive ground-based observation campaign, involving several telescopes — including those of the SPECULOOS and TRAPPIST projects, both led by the University of Liège.

Dr. Khalid Barkaoui, researcher on the SPECULOOS and TRAPPIST teams, oversaw these crucial follow-up observations. He explained: “The transit signal was unambiguous in our data. Our analysis ruled out all alternative explanations — the only viable scenario was that this tiny star hosts a Saturn-sized planet with an orbital period of just over three days. Additional observations confirmed that its mass is about half that of Saturn. This is clearly a giant planet.”

TOI-6894 is now the smallest star known to host a transiting giant planet, with a radius 40% smaller than that of any previous such host.

Prof. Jamila Chouquar, who was an astronomer at ULiege at the time of the discovery, added: “We previously believed that stars this small couldn’t form or hold on to giant planets. But stars like TOI-6894 are the most common type in the Milky Way — so our discovery suggests there may be far more giant planets out there than we thought.”

A Challenge to Planet Formation Models

According to current planet formation models, giant planets are rare around small stars. This is because their protoplanetary disks — the gas and dust reservoirs from which planets form — are thought to lack the material needed to build massive cores and accrete thick gas envelopes.

Dr. Mathilde Timmermans, member of the SPECULOOS team and ULiege astronomer at the time of the discovery, noted: “The existence of TOI-6894b is hard to reconcile with existing models. None can fully explain how it formed. This shows that our understanding is incomplete, and underscores the need to find more such planets. That’s exactly the goal of MANGO, a SPECULOOS sub-program led by myself and Dr. Georgina Dransfield at the University of Birmingham.”

Prof. Michaël Gillon,Fund for Scientific Research — FNRS Research Director at ULiege and head of the SPECULOOS and TRAPPIST programs, concluded: “This giant planet orbiting a tiny star reveals that planetary diversity in the galaxy is even greater than we imagined. Most of the targets observed by SPECULOOS and TRAPPIST are similar stars, or even smaller — so we’re well positioned to uncover more cosmic outliers in the years ahead.”

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‘That’s Quite A Flip-Flop’: BBC Presenter Burns Nigel Farage Over Deportation U-Turn

A BBC presenter accused Nigel Farage of performing “quite a flip-flop” as he prepares to unveil his plan to deport anyone who enters the UK illegally.

Jon Kay pointed out that the Reform UK leader said just a year ago that doing so was “impossible” so it was “pointless” to even discuss it.

In a remarkable U-turn, Farage will today announce that a Reform government would set up a “UK deportation command” if it wins the next election to remove all illegal immigrants from the country.

But asked by GB news last year if he supported the deportation of illegal immigrants, Farage said: “It’s impossible to do. Literally impossible to do.

“For us, at the moment, it’s a political impossibility.”

Asked if it was his “ambition” to do so, he replied: “No … it’s pointless even going there. It’s a political impossibility. We simply can’t do it.”

On BBC Breakfast this morning, Kay reminded former Reform chairman Zia Yusuf of Farage’s previous view.

He said: “Only a year ago, Nigel Farage was asked about removing all illegal immigrants. Back then he said it is ‘impossible’ to remove all illegal immigrants. ‘It is a political impossibility’.

“And then he was asked if it was an ambition for Reform UK and he said ‘no, it’s pointless even going there. It is a political impossibility, We simply can’t do it’. So what has changed in a year?”

Yusuf replied: “What’s changed is we’ve done the work. Nigel didn’t say it was impossible, he said it was a political impossibility. His view on that has decisively changed because of the facts on the ground and because of the fact that we’ve now done the work.”

But Kay told him: “That’s quite a flip-flop, isn’t it, by Mr Farage? To say 12 months ago it’s politically impossible, and now he’s saying we’re going to do it?”

Yusuf said: “We’ve done the work and Nigel has taken the view that not only can this be done, it must be done. As Winston Churchill said, he who never changes his mind never changes anything.”

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‘That’s quite a flip flop by Mr Farage to say 12 months ago it’s politically impossible and now he’s saying we’re going to do it?’

Zia Yusuf from Reform UK was questioned on #BBCBreakfast about plans to organise mass deportations of all illegal migrants to tackle small boats… pic.twitter.com/KpjfNrOnDr

— BBC Breakfast (@BBCBreakfast) August 26, 2025

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‘That’s quite a flip flop by Mr Farage to say 12 months ago it’s politically impossible and now he’s saying we’re going to do it?’

Zia Yusuf from Reform UK was questioned on #BBCBreakfast about plans to organise mass deportations of all illegal migrants to tackle small boats… pic.twitter.com/KpjfNrOnDr

— BBC Breakfast (@BBCBreakfast) August 26, 2025

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