Beta Pictoris d has been identified as the third known planet orbiting the young star Beta Pictoris, about 63 light-years from Earth. The gas giant appears to have evaded detection for more than a decade because it is roughly 100 times dimmer than its planetary neighbour, Beta Pictoris b, and lies against a bright disk of dust and debris.¹

The two discovery teams arrived at the result independently, using notably different techniques. Researchers working with NASA’s James Webb Space Telescope did not initially set out to find another planet. As lead author Aidan Gibbs put it, “We weren’t looking for a new planet. We were trying to understand one we already knew.”² Webb’s NIRSpec instrument found the object through a spectral pattern associated with carbon monoxide; subsequent MIRI observations detected water vapour and methane, strengthening the case that the signal came from a gas-giant atmosphere rather than reflected dust.²

A separate team using the European Southern Observatory’s Very Large Telescope in Chile identified the planet in direct images made with the ERIS instrument. By revisiting older SPHERE observations, researchers also found faint indications of the same object in archival data and tracked its changing position, supporting the conclusion that it is orbiting the star.¹

The findings converge on a planet with an estimated mass of about 2.4 times Jupiter’s and an orbit near 30 astronomical units from its star, broadly comparable to Neptune’s distance from the Sun. Beta Pictoris is only about 23 million years old, making its dusty disk and three-planet system a valuable setting for studying how young planets interact with the material left over from their formation.¹

The contrast between spectroscopy and direct imaging is central to the result: one method identified the planet by its chemical “fingerprint,” the other by its motion in images. Their agreement suggests that re-examining astronomical archives with newer instruments and techniques may reveal other worlds concealed in plain sight.²