FAUST XII. Accretion streamers and jets in the VLA 1623--2417 protocluster
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| Format: | Preprint |
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2024
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| author | Codella, C. Podio, L. De Simone, M. Ceccarelli, C. Ohashi, S. Chandler, C. J. Sakai, N. Pineda, J. E. Segura-Cox, D. M. Bianchi, E. Cuello, N. López-Sepulcre, A. Fedele, D. Caselli, P. Charnley, S. Johnstone, D. Zhang, Z. E. Maureira, M. J. Zhang, Y. Sabatini, G. Svoboda, B. Jiménez-Serra, I. Loinard, L. Mercimek, S. Murillo, N. Yamamoto, S. |
| author_facet | Codella, C. Podio, L. De Simone, M. Ceccarelli, C. Ohashi, S. Chandler, C. J. Sakai, N. Pineda, J. E. Segura-Cox, D. M. Bianchi, E. Cuello, N. López-Sepulcre, A. Fedele, D. Caselli, P. Charnley, S. Johnstone, D. Zhang, Z. E. Maureira, M. J. Zhang, Y. Sabatini, G. Svoboda, B. Jiménez-Serra, I. Loinard, L. Mercimek, S. Murillo, N. Yamamoto, S. |
| contents | The ALMA interferometer has played a key role in revealing a new component of the Sun-like star forming process: the molecular streamers, i.e. structures up to thousands of au long funneling material non-axisymmetrically to disks. In the context of the FAUST ALMA LP, the archetypical VLA1623-2417 protostellar cluster has been imaged at 1.3 mm in the SO(5$_6$--4$_5$), SO(6$_6$--5$_5$), and SiO(5--4) line emission at the spatial resolution of 50 au. We detect extended SO emission, peaking towards the A and B protostars. Emission blue-shifted down to 6.6 km s$^{-1}$ reveals for the first time a long ($\sim$ 2000 au) accelerating streamer plausibly feeding the VLA1623 B protostar. Using SO, we derive for the first time an estimate of the excitation temperature of an accreting streamer: 33$\pm$9 K. The SO column density is $\sim$ 10$^{14}$ cm$^{-2}$, and the SO/H$_2$ abundance ratio is $\sim$ 10$^{-8}$. The total mass of the streamer is 3 $\times$ 10$^{-3}$ $Msun$, while its accretion rate is 3--5 $\times$ 10$^{-7}$ Msun yr$^{-1}$. This is close to the mass accretion rate of VLA1623 B, in the 0.6--3 $\times$ 10$^{-7}$ Msun yr$^{-1}$ range, showing the importance of the streamer in contributing to the mass of protostellar disks. The highest blue- and red-shifted SO velocities behave as the SiO(5--4) emission, the latter species detected for the first time in VLA1623-2417: the emission is compact (100-200 au), and associated only with the B protostar. The SO excitation temperature is $\sim$ 100 K, supporting the occurrence of shocks associated with the jet, traced by SiO. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_10258 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | FAUST XII. Accretion streamers and jets in the VLA 1623--2417 protocluster Codella, C. Podio, L. De Simone, M. Ceccarelli, C. Ohashi, S. Chandler, C. J. Sakai, N. Pineda, J. E. Segura-Cox, D. M. Bianchi, E. Cuello, N. López-Sepulcre, A. Fedele, D. Caselli, P. Charnley, S. Johnstone, D. Zhang, Z. E. Maureira, M. J. Zhang, Y. Sabatini, G. Svoboda, B. Jiménez-Serra, I. Loinard, L. Mercimek, S. Murillo, N. Yamamoto, S. Solar and Stellar Astrophysics Astrophysics of Galaxies The ALMA interferometer has played a key role in revealing a new component of the Sun-like star forming process: the molecular streamers, i.e. structures up to thousands of au long funneling material non-axisymmetrically to disks. In the context of the FAUST ALMA LP, the archetypical VLA1623-2417 protostellar cluster has been imaged at 1.3 mm in the SO(5$_6$--4$_5$), SO(6$_6$--5$_5$), and SiO(5--4) line emission at the spatial resolution of 50 au. We detect extended SO emission, peaking towards the A and B protostars. Emission blue-shifted down to 6.6 km s$^{-1}$ reveals for the first time a long ($\sim$ 2000 au) accelerating streamer plausibly feeding the VLA1623 B protostar. Using SO, we derive for the first time an estimate of the excitation temperature of an accreting streamer: 33$\pm$9 K. The SO column density is $\sim$ 10$^{14}$ cm$^{-2}$, and the SO/H$_2$ abundance ratio is $\sim$ 10$^{-8}$. The total mass of the streamer is 3 $\times$ 10$^{-3}$ $Msun$, while its accretion rate is 3--5 $\times$ 10$^{-7}$ Msun yr$^{-1}$. This is close to the mass accretion rate of VLA1623 B, in the 0.6--3 $\times$ 10$^{-7}$ Msun yr$^{-1}$ range, showing the importance of the streamer in contributing to the mass of protostellar disks. The highest blue- and red-shifted SO velocities behave as the SiO(5--4) emission, the latter species detected for the first time in VLA1623-2417: the emission is compact (100-200 au), and associated only with the B protostar. The SO excitation temperature is $\sim$ 100 K, supporting the occurrence of shocks associated with the jet, traced by SiO. |
| title | FAUST XII. Accretion streamers and jets in the VLA 1623--2417 protocluster |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2402.10258 |