Astronomers have confirmed the discovery of Elias 2-24b, the youngest known exoplanet, located approximately 450 light-years from Earth. The research team, led by Andrea Bernardi at Diego Portales University in Chile, identified the exoplanet within a protoplanetary disk surrounding the star Elias 2-24. This discovery is significant as it challenges existing models of planetary formation.
The team focused on seven protoplanetary disks, looking for gaps believed to be created by forming planets. They reanalyzed coronagraph data, which blocks out the central star's light, allowing dimmer celestial bodies to be observed. The researchers confirmed that a bright spot detected in the disk was gravitationally bound to Elias 2-24, indicating it is a planet.
Elias 2-24b orbits its star at a distance of approximately 55 astronomical units and has a mass estimated to be between 1.9 and 4.0 times that of Jupiter. Its host star is less than 1 million years old, suggesting that Elias 2-24b is similarly young. Previously, the youngest confirmed exoplanets were over 5 million years old, making this discovery notable.
The findings suggest that the core accretion model of planet formation, which posits that giant planets form from a solid core attracting gas, may need reevaluation. Lucas Siesa, a professor at Diego Portales University and coauthor of the study, stated that Elias 2-24b demonstrates that current models may be missing important processes in planet formation.
The Nancy Grace Roman Space Telescope, launched by NASA in August, is expected to enhance the search for young planets with its advanced coronagraph technology. Siesa remarked that this represents the beginning of a new era in planetary discovery, allowing astronomers to observe planet formation in action.