[사이테크 플러스] “The discus of estimated moon formation has been captured around an exoplanet 400 light-years away.”

International research team “First confirmation of exoplanets with moons”

(Seoul = Yonhap News) Reporter Joo-Young Lee = For the first time, a circumplanetary disk, believed to be forming the moon, has been detected around a gaseous Jupiter exoplanet 400 light-years away.

An international research team led by the Harvard-Smithsonian Center for Astrophysics (CfA) published on the 23rd in the International Journal of Astrophysical Journal Letters that one of two giant Jupiter exoplanets orbiting a star 400 light-years away (PDS 70c) ) discovered a disk around a planet made of material that could make the moon.

Close-up of the star PDS 70 400 light-years away and the young Jupiter planet PDS 70c orbiting the star

The star PDS 70 is in the center of the image on the left, while the enlarged image on the right shows the exoplanet PDS 70c and the surrounding disk between the star and the massive interstellar disk (bright red area) that surrounds it. Two planets were found in the star PDS 70, but the other planet PDS 70b is not visible in the picture. PDS 70c appears to have formed its own disk by pulling material from the disk around the star. Scientists believe that the moon is formed by the agglomeration of matter in the disk around the planet. [ALMA(ESO/NAOJ/NRAO)/Benisty et al. 제공. 재판매 및 DB 금지]

The research team explained that this is the first time that a moon-forming disk has been identified around an exoplanet. Previously, disk traces were found around the PDS 70c, but the disk and the surrounding environment were indistinguishable.

Dr. Miriam Benentiti of the University of Grenoble, who led the observation of exoplanets using the Atacama Large-Millimeter/Sub-Millimeter Assemblies (ALMA), a radio telescope in the northern desert of Chile, said, “This study is a study of planetary disks where satellites can be made It was clearly captured,” he said.

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He explained that the ALMA observations were high enough to clearly confirm that the disk was related to the central planet, and that it was possible to estimate the disk’s size for the first time.

As a result of the analysis, the diameter of this disk is about the distance between the Sun and Earth (150 million km), and the total mass is large enough to form up to three moon-sized moons.

The results of this study are expected to contribute to understanding the process by which the moon and planets are formed.

Planets are formed by the aggregation of matter in a disk made of matter left over from the formation of stars. As the planet grows and its gravitational force becomes stronger, it pulls on the surrounding matter to form a disk around it. Within the disk around the planet, it is believed that matter again aggregates and the masses collide to form the moon.

However, specific details such as when, where, and how the planets and the moon form are not known, so the academic community expects that the PDS 70c observational study will provide a good opportunity to improve our understanding.

Dr. Miriam Kepler at the Max Planck Institute of Astronomy in Germany, co-author of the paper, said, “So far, more than 4,000 exoplanets have been discovered, but all of them are in a mature stage. They are the only exoplanets discovered so far that are in the process of being formed.”

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