2023-08-04 07:14:00
Seoul National University Department of Physics and Astronomy Professor Jeong-Eun Lee’s research team’s image of triplets being formed in interstellar clouds observed with the Atacama millimeter/submillimeter radio interferometer (ALMA). / A research team led by ALMA domestic researchers is born in space dust The formation process of ‘dung-i-byeol’ was revealed. This research result is a combination of radio telescope observations and supercomputer simulations, and for the first time confirmed the process of receiving materials necessary for the birth of a fetal star. An international research team led by Professor Lee Jung-eun of the Department of Physics and Astronomy at Seoul National University has developed a multi-primitive stellar system ‘IRAS 04239’. As a result of observing +2436′ with the Atacama Millimeter/Submillimeter Radio Interferometer (ALMA) radio telescope in Chile, it was announced on the 4th that a large spiral arm exists around three embryonic stars. Usually, several stars are formed at the same time. It is born with ‘multiplicity’. To date, several scenarios have been proposed to explain the star formation process, but the multiplicity formation process has not been identified. Formation multiplicity is very important for a comprehensive understanding of star formation theory. What is mainly reported in observations of embryonic stars is a ‘streamer’, a structure of gas flowing towards the embryonic star. The streamer, which supplies substances to the embryonic star, serves as an umbilical cord that supplies nutrients to the embryo. It shows how a fetal star inhales gas to grow, but it is not yet known how the streamer’s gas flow is formed. Interstellar observations by Seoul National University’s Department of Physics and Astronomy Professor Jeongeun Lee’s research team with the Atacama Millimeter/Submillimeter Radio Interferometer (ALMA) The phenomenon observed by the ALMA research team is three polystars that appeared at a distance of 460 light years (regarding 9.46 trillion km, the distance that light travels in a year) from Earth. It is a spiral gas structure that appeared around it. This structure was discovered in the light emitted by sulfur monoxide molecules. The sulfur monoxide molecules spread to 400 AU (astronomical unit, 1 AU is the distance between the Earth and the sun) around the embryonic star. The research team calculated the speed of sulfur monoxide gas using the Doppler effect. The Doppler effect refers to a phenomenon in which the measured electromagnetic wave wavelength changes when an object emitting electromagnetic waves moves closer or farther away from an observer. As a result of analyzing the motion of the gas, the three giant sulfur monoxide gas structures were confirmed to be streamers flowing in the embryonic star. To improve the accuracy of the observations, the research team compared the velocity data of sulfur monoxide molecules with supercomputer fluid dynamics simulations. did. The simulation was performed using the National Astronomical Observatory (NAOJ) astronomical supercomputer with a team led by Professor Tomoaki Matsumoto of Hosei University in Japan. The research team explained that stars are born in a ‘hybrid scenario’ by comparing observation data and simulation. It is a combination of the ‘turbulent eruption scenario’, in which interstellar clouds with turbulent flow erupt into several dense gas masses, and the ‘disk eruption scenario’, in which the surrounding gas forms like a spiral arm and sucks in matter. It is an analysis that multiple stars and streamers are formed only when a dynamic situation occurs in the universe. Depending on the pattern of star formation, it is possible to estimate whether planets can be formed around them. Professor Lee Jeong-eun said, “Planets can be formed in the gas and dust disks that form around protostars, and only when a calm environment lasts for a long time.” It will not be conducive to the formation of planets due to the close proximity of stars.”
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