Early Planet Formation in Embedded Disks (eDisk) XXII: Keplerian disk, disk structures and jets/outflows in the Class 0 protostar IRAS 04166+2706
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arXiv
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| Natura: | Preprint |
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2025
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| author | Phuong, Nguyen Thi Lee, Chang Won Tobin, John J. Ohashi, Nagayoshi Jørgensen, Jes K. Takakuwa, Shigehisa Aikawa, Yuri Aso, Yusuke Li, Zhi-Yun Koch, Patrick M. Williams, Jonathan P. Gavino, Sacha Lin, Zhe-Yu Daniel Tomida, Kengo Kwon, Woojin Looney, Leslie W. Han, Ilseung Santamarıa-Miranda, Alejandro Lai, Shih-Ping Hsi-Wei, Yen Thieme, Travis J. Sai, Jinshi Flores, Christian |
| author_facet | Phuong, Nguyen Thi Lee, Chang Won Tobin, John J. Ohashi, Nagayoshi Jørgensen, Jes K. Takakuwa, Shigehisa Aikawa, Yuri Aso, Yusuke Li, Zhi-Yun Koch, Patrick M. Williams, Jonathan P. Gavino, Sacha Lin, Zhe-Yu Daniel Tomida, Kengo Kwon, Woojin Looney, Leslie W. Han, Ilseung Santamarıa-Miranda, Alejandro Lai, Shih-Ping Hsi-Wei, Yen Thieme, Travis J. Sai, Jinshi Flores, Christian |
| contents | We present ALMA observations of the Class 0 protostar IRAS 04166+2706, obtained as part of the ALMA large program Early Planet Formation in Embedded Disks (eDisk). These observations were made in the 1.3 mm dust continuum and molecular lines at angular resolutions of $\sim 0.05''$ ($\sim 8$ au) and $\sim 0.16''$ ($\sim25$ au), respectively. The continuum emission shows a disk-like structure with a radius of $\sim22$ au. Kinematical analysis of $^{13}$CO(2-1), C$^{18}$O(2-1), H$_2$CO (3$_{0,3}$-2$_{0,2}$), CH$_3$OH (4$_2$-3$_1$) emission demonstrates that these molecular lines trace the infalling-rotating envelope and possibly a Keplerian disk, enabling us to estimate the protostar mass to be $0.15 \rm{M_\odot} < \rm{M_\star} < 0.39 M_\odot$. The dusty disk is found to exhibit a brightness asymmetry along its minor axis in the continuum emission, probably caused by a flared distribution of the dust and the high optical depth of the dust emission. In addition, the CO(2-1) and SiO(5-4) emissions show knotty and wiggling motions in the jets. Our high angular resolution observations revealed the most recent mass ejection events, which have occurred within the last $\sim 25$ years. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_07212 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Early Planet Formation in Embedded Disks (eDisk) XXII: Keplerian disk, disk structures and jets/outflows in the Class 0 protostar IRAS 04166+2706 Phuong, Nguyen Thi Lee, Chang Won Tobin, John J. Ohashi, Nagayoshi Jørgensen, Jes K. Takakuwa, Shigehisa Aikawa, Yuri Aso, Yusuke Li, Zhi-Yun Koch, Patrick M. Williams, Jonathan P. Gavino, Sacha Lin, Zhe-Yu Daniel Tomida, Kengo Kwon, Woojin Looney, Leslie W. Han, Ilseung Santamarıa-Miranda, Alejandro Lai, Shih-Ping Hsi-Wei, Yen Thieme, Travis J. Sai, Jinshi Flores, Christian Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies We present ALMA observations of the Class 0 protostar IRAS 04166+2706, obtained as part of the ALMA large program Early Planet Formation in Embedded Disks (eDisk). These observations were made in the 1.3 mm dust continuum and molecular lines at angular resolutions of $\sim 0.05''$ ($\sim 8$ au) and $\sim 0.16''$ ($\sim25$ au), respectively. The continuum emission shows a disk-like structure with a radius of $\sim22$ au. Kinematical analysis of $^{13}$CO(2-1), C$^{18}$O(2-1), H$_2$CO (3$_{0,3}$-2$_{0,2}$), CH$_3$OH (4$_2$-3$_1$) emission demonstrates that these molecular lines trace the infalling-rotating envelope and possibly a Keplerian disk, enabling us to estimate the protostar mass to be $0.15 \rm{M_\odot} < \rm{M_\star} < 0.39 M_\odot$. The dusty disk is found to exhibit a brightness asymmetry along its minor axis in the continuum emission, probably caused by a flared distribution of the dust and the high optical depth of the dust emission. In addition, the CO(2-1) and SiO(5-4) emissions show knotty and wiggling motions in the jets. Our high angular resolution observations revealed the most recent mass ejection events, which have occurred within the last $\sim 25$ years. |
| title | Early Planet Formation in Embedded Disks (eDisk) XXII: Keplerian disk, disk structures and jets/outflows in the Class 0 protostar IRAS 04166+2706 |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2508.07212 |