Webb Data Reveals Hidden Giant Planet After Software Clears Starlight

But telescopes wobble, even in space. JWST needs cryocoolers to keep its NIRCam instrument extremely cold, and the coolers' small motors vibrate the mirrors. That tiny movement scatters starlight and leaves behind enough glare to bury a planet.

The takeaway: the problem isn't collecting data. It's cleaning it.

What is a 'digital twin' of a telescope?

Wang and colleagues built a tool called Physics-based Learning for Imaging Planets, or FLIP. It creates a digital twin — a virtual replica that simulates how starlight travels through the telescope's mirrors and onto its detectors.

The team then tunes the twin to match millions of tiny imperfections in the real instrument, adjusting it until it aligns with actual observations. Astronomers subtract the simulated glare from the real image, and faint planets pop out.

To test the method, the researchers reanalyzed JWST observations of two star systems with known exoplanets — HIP 65426 and 51 Eridani — plus one system, TYC 5899, with no known planets.

The results were decisive. In detecting faint exoplanets, FLIP beat conventional image-processing techniques by a factor of two to 15. That margin pulled 51 Eridani b out of the two-year-old data.

"We showed that we can actually recover a planet that people previously couldn't see," Wang said. "This is real data in a real scenario. It was science left on the table because we didn't have the right tools to analyze the data in the most optimal way."

The plain-English version: better software turned old images into a discovery.

Could this find Earth-like planets someday?

The team hopes other astronomers adopt FLIP to recover undiscovered exoplanets still buried in starlight. The stakes extend beyond one gas giant.

NASA has proposed the Habitable Worlds Observatory, a future mission designed to directly photograph Earth-like planets orbiting distant sun-like stars. Techniques like FLIP could prove essential to that goal.

Team leader Rodrigo Ferrer-Chavez of Northwestern University framed the bigger picture: "We know of no planets around other stars that are like those in our own solar system. It's not that they don't exist. It's that we cannot see them."

"Every time we improve our techniques, we discover new types of planets," he added. "By finding more planets, we can better understand how planetary systems form and evolve, and ultimately how typical our own solar system truly is."

One caveat deserves attention. The Nature paper demonstrates the method on known targets; the true test — finding planets nobody expected — still lies ahead.

For now, one hidden giant has stepped out of the glare. Others may follow.