Triple Spiral Arms of a Triple Protostar System Imaged in Molecular Lines

Abstract Most stars form in multiple-star systems. For a better understanding of their formation processes, it is important to resolve the individual protostellar components and the surrounding envelope and disk material at the earliest possible formation epoch, because the formation history can be...

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Bibliographic Details
Published in:The Astrophysical journal 2023-08, Vol.953 (1), p.82
Main Authors: Lee, Jeong-Eun, Matsumoto, Tomoaki, Kim, Hyun-Jeong, Lee, Seokho, Harsono, Daniel, Bae, Jaehan, Evans II, Neal J., Inutsuka, Shu-ichiro, Choi, Minho, Tatematsu, Ken’ichi, Lee, Jae-Joon, Jaffe, Daniel
Format: Article
Language:English
Subjects:
Accretion
Astrophysics
Deposition
Emission
Magnetohydrodynamic simulation
Numerical simulations
Protostars
Radio telescopes
Star formation
Stellar systems
Sulfur dioxide
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Summary:Abstract Most stars form in multiple-star systems. For a better understanding of their formation processes, it is important to resolve the individual protostellar components and the surrounding envelope and disk material at the earliest possible formation epoch, because the formation history can be lost in a few orbital timescales. Here we present Atacama Large Millimeter/submillimeter Array observational results of a young multiple protostellar system, IRAS 04239+2436, where three well-developed large spiral arms were detected in the shocked SO emission. Along the most conspicuous arm, the accretion streamer was also detected in the SO 2 emission. The observational results are complemented by numerical magnetohydrodynamic simulations, where those large arms only appear in magnetically weakened clouds. Numerical simulations also suggest that the large triple spiral arms are the result of gravitational interactions between compact triple protostars and the turbulent infalling envelope.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/acdd5b