Origin of the Shell Structure in the Primary Outflow from IRAS 15398-3359
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| Format: | Preprint |
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2025
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| _version_ | 1866916758653239296 |
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| author | Hanawa, Tomoyuki Okoda, Yuki Yang, Yao-Lun Sakai, Nami |
| author_facet | Hanawa, Tomoyuki Okoda, Yuki Yang, Yao-Lun Sakai, Nami |
| contents | IRAS 15398-3359, a Class 0 protostar in Lupus I star forming region, is associated with three generations of outflows. The primary outflow, i.e., the most recent one, shows internal structure named ``shell structure'' in the near infrared emission map. The shell structure is also seen in the emission lines of CO, H$_2$CO, and others species. We find a similar structure in an underexpanded jet produced in aerodynamics and other engineering applications. A high pressure gas ejected through a nozzle expands to form a supersonic flow. When the pressure of the ejected gas becomes lower than that of the ambient gas, the jet is compressed to form a shock wave. The shock heated gas expands again to form substructures along the jet. We examine the similarity between the primary outflow of IRAS 15398-3359 and industrial underexpanded jet and the possibility that the shell structure of the former is due to repeated expansion and compression in the direction perpendicular to the jet propagation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_08470 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Origin of the Shell Structure in the Primary Outflow from IRAS 15398-3359 Hanawa, Tomoyuki Okoda, Yuki Yang, Yao-Lun Sakai, Nami Astrophysics of Galaxies Solar and Stellar Astrophysics IRAS 15398-3359, a Class 0 protostar in Lupus I star forming region, is associated with three generations of outflows. The primary outflow, i.e., the most recent one, shows internal structure named ``shell structure'' in the near infrared emission map. The shell structure is also seen in the emission lines of CO, H$_2$CO, and others species. We find a similar structure in an underexpanded jet produced in aerodynamics and other engineering applications. A high pressure gas ejected through a nozzle expands to form a supersonic flow. When the pressure of the ejected gas becomes lower than that of the ambient gas, the jet is compressed to form a shock wave. The shock heated gas expands again to form substructures along the jet. We examine the similarity between the primary outflow of IRAS 15398-3359 and industrial underexpanded jet and the possibility that the shell structure of the former is due to repeated expansion and compression in the direction perpendicular to the jet propagation. |
| title | Origin of the Shell Structure in the Primary Outflow from IRAS 15398-3359 |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2505.08470 |