The galaxy is collapsing into an interstellar cloud of gas and dust, just like our own shape



2020-11-24 13:48:32
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The galaxy is like our own shape, collapsing into interstellar gas and dust clouds, creating young stars surrounded by protoplanetary disks. Planets formed within these protoplanetary disks, leaving distinct gaps, which were recently observed in the evolutionary system as the parent cloud was cleared. ALMA has now unveiled an evolved protoplanetary disk in which the surrounding clouds still offer large openings through large filament growth. This indicates that the accumulation of matter on the protoplanetary disk is taking longer than previously thought, affecting the future evolution of the planetary system.

A team of astronomers led by Dr. Felipe Alves of the Geochemical Research Center (CAS) of the Max Planck Institute for Extraterrestrial Physics (MPE) uses the Atacama damm / ya Millimeter Array (ALMA) studies the accretion process of stellar objects[BHB2007] 1. The system at the end of the molecular cloud of the pipeline. ALMA data shows that there is a disk of dust and gas around the protostar, and a large gas thread around the disk. Scientists interpret these filaments as growth belts, which direct materials from the surrounding clouds to discs.

The disc will reprocess the growth material and release it to the protostar. When the stellar disk has formed and matured to form a planet, the observed structure is very unusual for a stellar object at this stage of evolution (estimated age is 1,000,000 years). Alves said, “We are very surprised to see such prominent accretion filaments fall into the disk.” “The activity of the accumulated filaments shows that the disk is still growing and that protostars are growing.

The team also reported massive cavities in the disk. The cavity has a width of 70 astronomical units and contains a dense region of hot molecular gas. In addition, the additional data from the very large array (VLA) on the radio frequency indicated that there is non-thermal radiation in the same location where the hot gas is detected. These two pieces of evidence indicate that there is an interstellar object (a young giant planet or brown dwarf) in the stellar hole. When this companion sucks material off the disc, it heats the gas and can drive the highly ionized wind and / or jet. The research team estimated that an object with a mass between 4 and 70 Jupiter’s mass would be needed to create the observed orifice on the disk.

Paola Caselli, MPE Director and CAS Team Leader, said, “We have proposed a new star and planet formation together.” “Our observations strongly indicate that the protoplanetary disk is still absorbing matter after the planet begins to form. This is very important. Important, because the fresh matter falling into the disk, the chemical composition of the future planetary system and the dynamic evolution of the entire disk. “” These observations also set a new time limit for the formation of planets and the evolution of the disk, showing that it is just like us, how the galaxy was carved out of primitive clouds.


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