A Doomed Planet Keeps Its Secrets: The Mystery of WASP-12 b Deepens

By Space.Fan Editorial DeskSeptember 28, 2026 at 2:04 PM UTC

Astronomers are stumped as a gas giant planet spirals toward its star, forcing them to rethink how orbits decay.

Image · Space.Fan

The Drop

WASP-12 b is a giant that is slowly falling into its own . This is a process called orbital decay. Scientists have been trying to figure out why this moves closer to its so quickly. Usually, gravity and tides between a and a can explain this, but those theories do not match what we see here. The is falling much faster than expected. One popular idea was that another hidden, nearby was using its gravity to tilt WASP-12 b. This tilt would create heat and energy, which could explain the fast speed. Researchers tested this by looking for a small companion that could cause this tilt. If this mystery existed, it would have to be very massive to keep the moving that way. By checking old data and measuring the 's movement, scientists looked for signs of this hidden companion. Their data ruled out any s of the size needed to keep this process going. Without a nearby to push it, the reason for the quick spiral remains a mystery. The team used careful calculations of the 's wobble to confirm that no large hidden object is pulling on the system.

Why It Matters

This discovery forces scientists to reconsider their models of how s and s interact. Since our current math cannot explain why WASP-12 b is spiraling inward, it suggests there are unknown forces at play in space. Understanding these forces helps us learn more about how ary systems grow old and eventually vanish.

The Catch

While the researchers are confident that no large is responsible, their study cannot rule out everything. It is possible there are other, more complex things happening that we do not understand yet, or that our current methods for measuring movement have limits we have not fully uncovered.

Put That in Perspective

Scientists have tracked the path of WASP-12 b for a long time, noticing its orbit getting shorter. While this study closes the door on the 'hidden planet' theory, researchers will likely look at other ideas next, such as how the star's own internal magnetism might affect the planet's orbit.

Source September 28, 2026

Millholland, Laughlin

ApJL