Newfound 'baby' planet smashes record for youngest known world

A new exoplanet, Elias 2-24 b, has been confirmed as the youngest known planet, less than a million years old. It is still growing within the disk of gas and dust surrounding its host star. The discovery was made using archival data from the W. M. Keck Observatory, which partners with NASA. The planet is about as massive as Jupiter and orbits a star 450 light-years away. The confirmation of this baby planet challenges existing planet-formation models, which struggled to explain previous record holders that were more than 5 million years old.

• The team led by Andrea Bernardi analyzed archival observations of seven stars with debris disks, searching for planets embedded in the dusty disks. They found Elias 2-24 b in the gaps of these disks, which are believed to be the sites of planet formation.
• The planet's existence supports the core-accretion theory of planet formation, where planets form from material in the disk. The planet is still growing, which suggests that the process is ongoing.
• The discovery highlights the limitations of current telescopes in detecting young planets, as most telescopes cannot see these baby planets due to the dust and light from the stars.

This finding offers a time machine for scientists to study the early stages of planetary formation. The confirmation using Keck data solves a mystery that has puzzled astronomers for a decade. The planet is located in a narrow gap in the disk, which is a key indicator of planet formation. The discovery also emphasizes the importance of using multiple telescopes together to detect such young planets.

The confirmation of Elias 2-24 b is significant because it shows that current telescopes are not capable of detecting these young planets due to the dust and light from the stars. With new instruments like the Nancy Grace Roman Space Telescope, such detections should become easier. The discovery also highlights the need for more research into the early stages of planetary formation and the role of young stars and disks in shaping planetary systems.

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