Astronomers have directly imaged the faintest exoplanet yet captured from the ground, a gas giant circling the young star Beta Pictoris some 63 light-years from Earth. The discovery rests on patient re-examination of data stretching back more than ten years and on new observations that caught the planet in a moment when its brighter sibling no longer masked it.
Beta Pictoris d, as the new world is called, weighs roughly 2.4 Jupiter masses, measures 1.26 Jupiter radii across and registers an effective temperature of about 600 Kelvin. It orbits at 26 astronomical units from its host star on a path almost edge-on to our line of sight, neatly aligned with the system’s debris disk. That alignment is no coincidence. The planet’s gravity appears to carve the disk’s sharp inner edge, offering a live example of the dynamical sculpting long predicted by models of planetary formation.
A serendipitous find
The detection began as an attempt to track changes in the already-known planet Beta Pictoris b. Ben J. Sutlieff, astronomer at the University of Edinburgh, recalled the moment the team realised something else was present.
This was a serendipitous discovery. We initially wanted to look more at a known planet in the system, Beta Pictoris b, to see how it changed over time. However, when we went to analyse our images of the system, we noticed something else that led us down an entirely new path.
The crucial data came from non-coronagraphic observations with the Very Large Telescope’s Enhanced Resolution Imager and Spectrograph in December 2025, combined with eleven years of archival images from the James Webb Space Telescope’s Near Infrared Camera and the Very Large Telescope’s Sphere instrument. Astrometric measurements across that baseline confirmed the object shares the star’s motion and lies in the plane of the debris disk, ruling out a background star or galaxy.
Jayne L. Birkby, professor at the University of Oxford, captured the decade-long game of astronomical hide-and-seek.
Planet d, it seems, has been playing a game of hide-and-seek with us for over a decade and only now can we say found you!
Atmospheric clues and formation context
The planet’s colours stand out. Its red F410M minus F444W hue points to strong carbon dioxide absorption and elevated metallicity in the atmosphere, distinct from free-floating objects of similar age and temperature. Such chemistry offers a direct window into the raw material from which the planet assembled, reinforcing the picture of ordered processes at work in the disk.
