Astronomers Discover Youngest Planet Ever Found

How Researchers Confirmed Elias 2-24 b Using Keck Archives

Bernardi’s team examined archived coronagraph observations of seven young stars surrounded by debris disks filled with dust, gas, and ice. A coronagraph blocks stellar glare, allowing instruments to spot faint companions hidden inside gaps carved out by forming worlds. By searching the Keck Observatory Archive—a collaboration between Keck Observatory and the NASA Exoplanet Science Institute at Caltech/IPAC—the team matched observations collected in 2018 and 2020. Tracking the object’s movement over time confirmed it as a bona fide exoplanet rather than a background star or instrumental artifact, according to findings detailed in the study.

Challenging Current Planet-Formation Models

Standard theories suggest that a Jupiter-sized planet sitting roughly 55 times farther from its star than Earth is from the Sun—the distance where Elias 2-24 b orbits—should take longer than 5 million years to form. Existing record holders, such as a four-way tie involving two planets orbiting PDS 70 and two orbiting WISPIT 2, are all more than 5 million years old, according to Lucas Cieza, a professor at the Instituto de Estudios Astrofísicos in Chile and co-author of the paper.

“Our planet-formation models already struggled to explain the previous record holders for the youngest known planet… Elias 2-24 b shows us that even our best planet-formation models are still missing some important processes,” Cieza stated.

Resolving a Decade-Old Debate Over Elias 2-24

The confirmation settles a scientific debate that began roughly ten years ago. Earlier data from the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile revealed a distinct gap in the dusty disk around the young star Elias 2-24. Subsequent imaging by the European Southern Observatory’s Very Large Telescope identified a faint point of light inside that gap. While researchers suspected it could be a planet, standard accretion theories argued against rapid gas-giant formation at such extreme distances. Archival tracking from Keck ultimately verified that the object is indeed carving out its home disk.

What NASA’s Roman Space Telescope Means for Exoplanet Hunting

Detecting baby planets directly remains exceptionally difficult because thick circumstellar dust obscures visible and infrared light. Most of the roughly 6,000 confirmed exoplanets have been discovered via transits, which favor older, closer-in worlds. However, newly launched missions promise to bridge this observational gap. The Nancy Grace Roman Space Telescope, which launched August 30, features an advanced coronagraph capable of resolving tight orbits and spotting hidden Jupiter analogs. “With new instruments like NASA’s Nancy Grace Roman Space Telescope, such detections should become easier,” Bernardi noted.

Frequently Asked Questions

What is Elias 2-24 b?

Elias 2-24 b is the youngest confirmed exoplanet, estimated to be less than 1 million years old. It has a mass comparable to Jupiter and orbits a star located 450 light-years from Earth.

Why was Elias 2-24 b difficult to discover?

The planet is surrounded by thick dust and gas within its host star’s debris disk, hiding it from standard transit detection methods and pushing the limits of current telescope capabilities.

How did researchers confirm the planet’s existence?

Researchers analyzed NASA-funded archival data from the W. M. Keck Observatory collected in 2018 and 2020, verifying that the object’s movement matched orbital behavior rather than background noise.

How does Elias 2-24 b change planet-formation theories?

Standard models dictate that forming a Jupiter-size planet at Jupiter’s distance from the Sun takes about 5 million years, and a giant planet much farther out should take even longer. Finding a massive planet in a system under 1 million years old proves that current theories miss crucial acceleration processes.

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