James Webb Fishes Out an Invisible Planet from a Dusty Disk ⚡ экспресс
Using data from NIRSpec and MIRI aboard the James Webb Space Telescope, a third giant planet—β Pic d—has been found in the β Pictoris system. The planet was identified via spectral template matching at moderate spectral resolution, which for the first time allowed extraction of planetary molecular features from a bright debris disk. The spectrum shows clear absorption bands of CH₄, CO, and H₂O. Combining radial velocity measurements, astrometry, and orbital modeling, the semi-major axis exceeds 30 AU, consistent with the planet carving out the inner edge of the dust disk. Based on grids of atmospheric models and evolutionary tracks, its mass is estimated at 2–4 Jupiter masses. This result demonstrates the high sensitivity of spectral search methods to planets hidden in debris disks, which are difficult to detect with traditional broadband imaging.
Using James Webb, astronomers 'fished out' a third giant planet from the murky dust disk of the star β Pictoris. Two others were already known, but this one was hiding in the bright light, like a fish in muddy water.
Regular imaging didn't help, so they used splitting light into colors: it revealed the fingerprints of water, methane, and carbon monoxide. It's like fishing by chemical 'scent': instead of casting a net blindly, they used a precise lure—a template of molecular lines.
The fished-out planet β Pic d is 2–4 times more massive than Jupiter and orbits far out—farther than Neptune is from the Sun. With its gravity, it scrapes out the inner edge of the dust disk, like raking silt. A year on it lasts over a hundred Earth years, and the method itself opens our eyes: searching for worlds where before we saw only murk.
🎯 A year on β Pic d lasts at least a century and a half: the planet is so distant that a single orbit takes over 100 Earth years.