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How does the protoplanetary disk form a new planet? Astronomers Reveal Details of "Dust Waterfall" – TechNews Technology News



Newborn stars and planetary systems originate from protoplanetary disks full of gas dust Scientists recently used ALMA to uncover the majestic view of gas flow during the formation of the planet, which looks like a dusty waterfall.

The Proplyd or Protoplanetary disk is a dense disk of gas surrounding a newly formed young star, and the planetary system begins with the remaining material of the protoplanetary disk to form a star. This is also the most widely formed and evolved galaxy. Accept the nebula hypothesis model.

The Carnegie Science Institute and the University of Michigan team recently collected large millimeter and sub-millimeter ATAKAMA (ALMA) data to observe the specific wavelength of light emitted by carbon monoxide in the young star system HD 163296. , discovering the protoplanet. More details: The movement of the gas on the planet's original disk is more complex than expected, flowing like a waterfall from a height to a low, not just flowing on a plane.

This is the first time astronomers have measured the velocity of gas flowing in three different directions: the movement of gas around a star towards or outside a star and the upward or downward rotation of a vertical protoplanetary disk forming a stereoscopic 3D image that finds gas. In the form of three concentric rings, the original protoplanetary disk faces downwards and the distance from the central star is 87 AU, 140 AU and 237 AU, respectively.

After using this data to build a computer simulation, the researchers tried to place 3 planets at the three distance points above, and over time, the dust cascades observed by the team in HD 163296 appeared at these locations. It is likely that the new planet caused this spectacular flow of gas.

▲ The simulation found that the dust cascade was caused by a new planet.

Seeing a problem to be solved here: think of the farthest planet from the solar system, Neptune, and the distance from the sun is only 30 AU. In other words, the distance between the above-mentioned nascent planets and the parent star is quite distant, so these planets will remain after formation. After orbit or near orbit formation, does it migrate inward, becoming the existence of a gaseous giant planet like Saturn and Jupiter in the solar system?

According to Carnegie Institution astrophysicist Jaehan Bae, we can deduce all the information on how they get the atmosphere, but it takes longer. The current study focuses on the most abundant gas in the protoplanetary disk: carbon monoxide, which can be changed later . Detect low content gas such as methane and methanol to better understand the details of the original planetary disk.

The new article was published in the journal Nature.

(Source: National Radio Observatory)

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