Determining the methanol deuteration in the disk around V883 Orionis with laboratory measured spectroscopy
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| Format: | Preprint |
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2025
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| _version_ | 1866910996279328768 |
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| author | Zeng, Shaoshan Jeong, Jae-Hong Oyama, Takahiro Lee, Jeong-Eun Yang, Yao-Lun Sakai, Nami |
| author_facet | Zeng, Shaoshan Jeong, Jae-Hong Oyama, Takahiro Lee, Jeong-Eun Yang, Yao-Lun Sakai, Nami |
| contents | Deuterium fractionation, as studied through mono-deuterated methanol, is frequently used as a diagnostic tool to trace the physical conditions and chemical evolution of interstellar sources. This study investigates methanol deuteration in the disk around V883 Ori, utilising recent laboratory spectroscopic data for CH$_2$DOH and CH$_3$OD along with ALMA observations. The derived column densities for CH$_2$DOH and CH$_3$OD are (5.14$\pm$0.08) $\times $10$^{16}$ cm$^{-2}$ and (4.22$\pm$0.06) $\times$ 10$^{16}$ cm$^{-2}$, respectively. The analysis demonstrates the influence of spectroscopic data on determining molecular column density, excitation temperature, and, most importantly, the inferred D/H ratio. The D/H ratio for CH$_2$DOH is calculated to be (7.3$\pm$1.5) $\times$ 10$^{-3}$ after applying a statistical correction, whilst the D/H ratio for CH$_3$OD is (1.79$\pm$0.36) $\times$ 10$^{-2}$. The discovery of an unexpectedly low CH$_2$DOH/CH$_3$OD ratio (1.22$\pm$0.02) in V883 Ori, however, raises further questions about the synthesis and chemical processes involved in CH$_3$OD formation. Overall, this study underscores the importance of accurate spectroscopic data for studies of isotopic fractionation and provides new insights into methanol deuteration chemistry in star-forming regions. Future research, combining updated spectroscopy and chemical modelling, will help further constrain these processes across different masses and evolutionary stages. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_07794 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Determining the methanol deuteration in the disk around V883 Orionis with laboratory measured spectroscopy Zeng, Shaoshan Jeong, Jae-Hong Oyama, Takahiro Lee, Jeong-Eun Yang, Yao-Lun Sakai, Nami Solar and Stellar Astrophysics Astrophysics of Galaxies Deuterium fractionation, as studied through mono-deuterated methanol, is frequently used as a diagnostic tool to trace the physical conditions and chemical evolution of interstellar sources. This study investigates methanol deuteration in the disk around V883 Ori, utilising recent laboratory spectroscopic data for CH$_2$DOH and CH$_3$OD along with ALMA observations. The derived column densities for CH$_2$DOH and CH$_3$OD are (5.14$\pm$0.08) $\times $10$^{16}$ cm$^{-2}$ and (4.22$\pm$0.06) $\times$ 10$^{16}$ cm$^{-2}$, respectively. The analysis demonstrates the influence of spectroscopic data on determining molecular column density, excitation temperature, and, most importantly, the inferred D/H ratio. The D/H ratio for CH$_2$DOH is calculated to be (7.3$\pm$1.5) $\times$ 10$^{-3}$ after applying a statistical correction, whilst the D/H ratio for CH$_3$OD is (1.79$\pm$0.36) $\times$ 10$^{-2}$. The discovery of an unexpectedly low CH$_2$DOH/CH$_3$OD ratio (1.22$\pm$0.02) in V883 Ori, however, raises further questions about the synthesis and chemical processes involved in CH$_3$OD formation. Overall, this study underscores the importance of accurate spectroscopic data for studies of isotopic fractionation and provides new insights into methanol deuteration chemistry in star-forming regions. Future research, combining updated spectroscopy and chemical modelling, will help further constrain these processes across different masses and evolutionary stages. |
| title | Determining the methanol deuteration in the disk around V883 Orionis with laboratory measured spectroscopy |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2506.07794 |