Astronomers Confirm Discovery of the Youngest Known Exoplanet Ever

Astronomers have confirmed the discovery of the youngest known exoplanet, named Elias 2-24b, which is estimated to be around 1 million years old. This breakthrough discovery was made by a team of researchers led by Andrea Bernardi from Diego Portales University in Chile. The youngest exoplanets previously known were orbiting stars more than 5 million years old.

Elias 2-24b was identified by looking at seven protoplanetary disks with gaps in the dense matter, believed to be carved out by growing planets. The researchers used data from the W.M. Keck Observatory in Hawaii to analyze the positions of a bright spot within one of these gaps over time. They concluded that the dot was a celestial object gravitationally bound to Elias 2-24, confirming it as a planet.

The exoplanet orbits its star at a distance of approximately 55 astronomical units, and its mass is estimated to be between 1.9 to 4.0 times that of Jupiter. However, its relatively young age and far-away orbit have challenged existing planetary formation models. According to the core accretion model, giant planets like Jupiter should take around 5 million years to form. Yet, Elias 2-24b is already a giant planet behaving like one after only 1 million years.

This discovery suggests that current models may have some limitations and that more young planets could help refine these theories. The Nancy Grace Roman Space Telescope, launched by NASA recently, is equipped with a more advanced coronagraph than the one used in the original discovery. This new telescope is expected to detect more young planets and those obscured by their host stars, ushering in a new era of exoplanet discovery.