ALMA view of the L1448-mm protostellar system on disk scales: CH$_3$OH and H$^{13}$CN as new disk wind tracers
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2024
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| author | Nazari, P. Tabone, B. Ahmadi, A. Cabrit, S. van Dishoeck, E. F. Codella, C. Ferreira, J. Podio, L. Tychoniec, Ł. van Gelder, M. L. |
| author_facet | Nazari, P. Tabone, B. Ahmadi, A. Cabrit, S. van Dishoeck, E. F. Codella, C. Ferreira, J. Podio, L. Tychoniec, Ł. van Gelder, M. L. |
| contents | Protostellar disks are known to accrete, however, the exact mechanism that extracts the angular momentum and drives accretion in the low-ionization "dead" region of the disk is under debate. In recent years, magneto-hydrodynamic (MHD) disk winds have become a popular solution. Yet, observations of these winds require both high spatial resolution (${\sim}10$s au) and high sensitivity, which has resulted in only a handful of MHD disk wind candidates so far. In this work we present high angular resolution (${\sim}30$ au) ALMA observations of the emblematic L1448-mm protostellar system and find suggestive evidence for an MHD disk wind. The disk seen in dust continuum (${\sim}0.9$ mm) has a radius of ${\sim}23$ au. Rotating infall signatures in H$^{13}$CO$^+$ indicate a central mass of $0.4\pm 0.1$ M$_\odot$ and a centrifugal radius similar to the dust disk radius. Above the disk, we unveil rotation signatures in the outflow traced by H$^{13}$CN, CH$_3$OH, and SO lines and find a kinematical structure consistent with theoretical predictions for MHD disk winds. This is the first detection of an MHD disk wind candidate in H$^{13}$CN and CH$_3$OH. The wind launching region estimated from cold MHD wind theory extends out to the disk edge. The magnetic lever arm parameter would be $λ_ϕ \simeq 1.7$, in line with recent non-ideal MHD disk models. The estimated mass-loss rate is ${\sim}4$ times the protostellar accretion rate ($\dot{M}_{\rm acc} \simeq 2 \times 10^{-6} M_{\odot}/yr$) and suggests that the rotating wind could carry enough angular momentum to drive disk accretion. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_18631 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | ALMA view of the L1448-mm protostellar system on disk scales: CH$_3$OH and H$^{13}$CN as new disk wind tracers Nazari, P. Tabone, B. Ahmadi, A. Cabrit, S. van Dishoeck, E. F. Codella, C. Ferreira, J. Podio, L. Tychoniec, Ł. van Gelder, M. L. Astrophysics of Galaxies Earth and Planetary Astrophysics Solar and Stellar Astrophysics Protostellar disks are known to accrete, however, the exact mechanism that extracts the angular momentum and drives accretion in the low-ionization "dead" region of the disk is under debate. In recent years, magneto-hydrodynamic (MHD) disk winds have become a popular solution. Yet, observations of these winds require both high spatial resolution (${\sim}10$s au) and high sensitivity, which has resulted in only a handful of MHD disk wind candidates so far. In this work we present high angular resolution (${\sim}30$ au) ALMA observations of the emblematic L1448-mm protostellar system and find suggestive evidence for an MHD disk wind. The disk seen in dust continuum (${\sim}0.9$ mm) has a radius of ${\sim}23$ au. Rotating infall signatures in H$^{13}$CO$^+$ indicate a central mass of $0.4\pm 0.1$ M$_\odot$ and a centrifugal radius similar to the dust disk radius. Above the disk, we unveil rotation signatures in the outflow traced by H$^{13}$CN, CH$_3$OH, and SO lines and find a kinematical structure consistent with theoretical predictions for MHD disk winds. This is the first detection of an MHD disk wind candidate in H$^{13}$CN and CH$_3$OH. The wind launching region estimated from cold MHD wind theory extends out to the disk edge. The magnetic lever arm parameter would be $λ_ϕ \simeq 1.7$, in line with recent non-ideal MHD disk models. The estimated mass-loss rate is ${\sim}4$ times the protostellar accretion rate ($\dot{M}_{\rm acc} \simeq 2 \times 10^{-6} M_{\odot}/yr$) and suggests that the rotating wind could carry enough angular momentum to drive disk accretion. |
| title | ALMA view of the L1448-mm protostellar system on disk scales: CH$_3$OH and H$^{13}$CN as new disk wind tracers |
| topic | Astrophysics of Galaxies Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2402.18631 |