Rogue Planet Gave Itself Away with Warped Light ⚡ экспресс
Astronomers have spotted a free-floating planet—no host star attached—in the microlensing event KMT-2024-BLG-0816. This one's special because of the finite-source effect (the lensing object actually felt the disk of the background star) and a bunch of extra blended light from some unresolved neighbor. It’s the only known free-floating planet with a finite-source effect that also has unresolved blended light. That mixed light might be coming from a star the planet orbits—meaning it's not truly alone, just very distant.
The lone planet KMT-2024-BLG-0816, one of many free-floating planets, was discovered when its gravity acted like a magnifying glass for a few hours. Passing in front of a distant star, the invisible body warped space like a glass marble, and boosted the background light. Thanks to a rare coincidence, the planet passed so close to the line of sight that telescopes could observe how the brightness of different parts of the stellar disk changed — the lens slid across its surface.
A faint stray light added to the mystery: it doesn't look like starlight, but could be the ghost of its former host. If confirmed, for the first time a lone planet will be seen together with its parent star — albeit separated by trillions of kilometers. Subsequent brightness measurements in different colors will test this hypothesis.
🎯 Gravitational lensing was predicted by Einstein back in 1936, but he thought it impossible to detect.
🎬 In science fiction, rogue planets are icy worlds holding secrets of ancient civilizations, like in Asimov's novel 'Nemesis'.