Emma Chickles was sitting at the Magellan telescopes in Chile, staring at a single patch of sky, when the light started doing something genuinely unsettling. Every 8.5 minutes, it would brighten and dim, brighten and dim, as if someone were toggling a cosmic flashlight. Except this was not a flashlight. It was two dead stars locked in the fastest orbital dance astronomers have ever managed to catch in this much detail, and one of them is quite literally devouring the other.
The system, officially named ATLAS J1013−4516, is what astronomers call an ultracompact binary, and it is every bit as dramatic as that sounds. It contains two white dwarfs, the burnt-out cores left behind when sun-like stars exhaust their nuclear fuel. Each one is roughly Earth-sized but packs a mass comparable to our Sun. In other words, these things are absurdly dense. The donor star, the one getting stripped for parts, has an interior density roughly 250 times that of lead. Try to picture that. Now picture it being torn apart by gravity.
Chickles, an astronomer at MIT, led the team that published the discovery in The Astrophysical Journal on May 23, 2026. The system was first flagged by the ATLAS survey, which photographs huge swaths of sky looking for anything that changes. An algorithm caught minute brightness variations that previous studies had missed. That got Chickles on a plane to Chile with a brand new high-speed camera called proto-Lightspeed.
"Pointing at the system, I could actually watch the light rising and falling in real time as the two stars eclipsed each other," she told Phys.org. That is one of those sentences that sounds cool until you really think about it. She was watching two Earth-sized balls of degenerate matter circle each other so fast that the entire orbit fits into a commercial break. Every time one slid in front of the other, the light dipped. Because the system eclipses from our vantage point, the team could weigh and measure both stars with a precision that is usually impossible for objects this exotic.
Here is what is happening. The two white dwarfs are so close together, gravity is pulling plasma from the surface of one and slinging it toward the other. That stolen material forms an accretion disk, superheated to temperatures far above the surface of our Sun, swirling around the cannibal star in a glowing ring roughly the size of Saturn. It is stellar vampirism at its most violent, and it is happening in our cosmic backyard.
The 8.5-minute orbit is not just a fun fact for trivia night. Systems like this are prime targets for LISA, the Laser Interferometer Space Antenna, a space-based gravitational wave observatory scheduled for launch in the 2030s. LISA will listen for the ripples in spacetime that binary systems like ATLAS J1013−4516 pump out as they spiral closer together. Einstein's general relativity predicts that the orbital energy bleeds away as gravitational waves, which means these two dead stars are slowly but surely falling toward each other. Eventually, they will merge, probably triggering a Type Ia supernova or forming something even stranger.
"The system is on the short list of binaries that LISA should detect directly," Chickles says. That is a big deal. We have detected gravitational waves from black holes and neutron stars. White dwarfs are smaller, quieter, harder to hear. Finding a loud, nearby, well-understood system like this gives LISA a calibration target that could sharpen its sensitivity for everything else.
But the really wild part might be how many more of these systems are hiding in the data we already have. Chickles and her team found this one by combing through millions of images taken over the past decade. The signal was always there. It just needed the right algorithm and the right follow-up to pull it out of the noise. "If we found one this extreme already, many more are likely sitting in archives we already have," she says. "We just need better ways to look."
It is a reminder that space does not stop being weird just because we are not looking. Somewhere in the sky right now, there are stars tearing each other apart on timescales measured in minutes, and we have only just learned how to find them.
