Discovery of a collimated jet from the low luminosity protostar IRAS 16253$-$2429 in a quiescent accretion phase with the JWST
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| Format: | Preprint |
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2023
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| _version_ | 1866909070849474560 |
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| author | Narang, Mayank P., Manoj Tyagi, Himanshu Watson, Dan M. Megeath, S. Thomas Federman, Samuel Rubinstein, Adam E. Gutermuth, Robert Garatti, Alessio Caratti o Beuther, Henrik Bourke, Tyler L. Van Dishoeck, Ewine F. Evans II, Neal J. Anglada, Guillem Osorio, Mayra Stanke, Thomas Muzerolle, James Looney, Leslie W. Yang, Yao-Lun Tobin, John J. Klaassen, Pamela Karnath, Nicole Atnagulov, Prabhani Brunken, Nashanty Fischer, William J. Furlan, Elise Green, Joel Habel, Nolan Hartmann, Lee Linz, Hendrik Nazari, Pooneh Pokhrel, Riwaj Rahatgaonkar, Rohan Rocha, Will R. M. Sheehan, Patrick Slavicinska, Katerina Stutz, Amelia Tychoniec, Lukasz Wolk, Scott |
| author_facet | Narang, Mayank P., Manoj Tyagi, Himanshu Watson, Dan M. Megeath, S. Thomas Federman, Samuel Rubinstein, Adam E. Gutermuth, Robert Garatti, Alessio Caratti o Beuther, Henrik Bourke, Tyler L. Van Dishoeck, Ewine F. Evans II, Neal J. Anglada, Guillem Osorio, Mayra Stanke, Thomas Muzerolle, James Looney, Leslie W. Yang, Yao-Lun Tobin, John J. Klaassen, Pamela Karnath, Nicole Atnagulov, Prabhani Brunken, Nashanty Fischer, William J. Furlan, Elise Green, Joel Habel, Nolan Hartmann, Lee Linz, Hendrik Nazari, Pooneh Pokhrel, Riwaj Rahatgaonkar, Rohan Rocha, Will R. M. Sheehan, Patrick Slavicinska, Katerina Stutz, Amelia Tychoniec, Lukasz Wolk, Scott |
| contents | Investigating Protostellar Accretion (IPA) is a JWST Cycle~1 GO program that uses NIRSpec IFU and MIRI MRS to obtain 2.9--28~$μ$m spectral cubes of young, deeply embedded protostars with luminosities of 0.2 to 10,000~L$_{\odot}$ and central masses of 0.15 to 12~M$_{\odot}$. In this Letter, we report the discovery of a highly collimated atomic jet from the Class~0 protostar IRAS~16253$-$2429, the lowest luminosity source ($L_\mathrm{bol}$ = 0.2 $L_\odot$) in the IPA program. The collimated jet is detected in multiple [Fe~II] lines, [Ne~II], [Ni~II], and H~I lines, but not in molecular emission. The atomic jet has a velocity of about 169~$\pm$~15~km\,s$^{-1}$, after correcting for inclination. The width of the jet increases with distance from the central protostar from 23 to~60 au, corresponding to an opening angle of 2.6~$\pm$~0.5\arcdeg. By comparing the measured flux ratios of various fine structure lines to those predicted by simple shock models, we derive a shock {speed} of 54~km\,s$^{-1}$ and a preshock density of 2.0$\times10^{3}$~cm$^{-3}$ at the base of the jet. {From these quantities and using a suite of jet models and extinction laws we compute a mass loss rate between $0.4 -1.1\times10^{-10}~M_{\odot}$~yr~$^{-1}$.} The low mass loss rate is consistent with simultaneous measurements of low mass accretion rate ($2.4~\pm~0.8~\times~10^{-9}~M_{\odot}$~yr$^{-1}$) for IRAS~16253$-$2429 from JWST observations (Watson et al. in prep), indicating that the protostar is in a quiescent accretion phase. Our results demonstrate that very low-mass protostars can drive highly collimated, atomic jets, even during the quiescent phase. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_14061 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Discovery of a collimated jet from the low luminosity protostar IRAS 16253$-$2429 in a quiescent accretion phase with the JWST Narang, Mayank P., Manoj Tyagi, Himanshu Watson, Dan M. Megeath, S. Thomas Federman, Samuel Rubinstein, Adam E. Gutermuth, Robert Garatti, Alessio Caratti o Beuther, Henrik Bourke, Tyler L. Van Dishoeck, Ewine F. Evans II, Neal J. Anglada, Guillem Osorio, Mayra Stanke, Thomas Muzerolle, James Looney, Leslie W. Yang, Yao-Lun Tobin, John J. Klaassen, Pamela Karnath, Nicole Atnagulov, Prabhani Brunken, Nashanty Fischer, William J. Furlan, Elise Green, Joel Habel, Nolan Hartmann, Lee Linz, Hendrik Nazari, Pooneh Pokhrel, Riwaj Rahatgaonkar, Rohan Rocha, Will R. M. Sheehan, Patrick Slavicinska, Katerina Stutz, Amelia Tychoniec, Lukasz Wolk, Scott Solar and Stellar Astrophysics Astrophysics of Galaxies Investigating Protostellar Accretion (IPA) is a JWST Cycle~1 GO program that uses NIRSpec IFU and MIRI MRS to obtain 2.9--28~$μ$m spectral cubes of young, deeply embedded protostars with luminosities of 0.2 to 10,000~L$_{\odot}$ and central masses of 0.15 to 12~M$_{\odot}$. In this Letter, we report the discovery of a highly collimated atomic jet from the Class~0 protostar IRAS~16253$-$2429, the lowest luminosity source ($L_\mathrm{bol}$ = 0.2 $L_\odot$) in the IPA program. The collimated jet is detected in multiple [Fe~II] lines, [Ne~II], [Ni~II], and H~I lines, but not in molecular emission. The atomic jet has a velocity of about 169~$\pm$~15~km\,s$^{-1}$, after correcting for inclination. The width of the jet increases with distance from the central protostar from 23 to~60 au, corresponding to an opening angle of 2.6~$\pm$~0.5\arcdeg. By comparing the measured flux ratios of various fine structure lines to those predicted by simple shock models, we derive a shock {speed} of 54~km\,s$^{-1}$ and a preshock density of 2.0$\times10^{3}$~cm$^{-3}$ at the base of the jet. {From these quantities and using a suite of jet models and extinction laws we compute a mass loss rate between $0.4 -1.1\times10^{-10}~M_{\odot}$~yr~$^{-1}$.} The low mass loss rate is consistent with simultaneous measurements of low mass accretion rate ($2.4~\pm~0.8~\times~10^{-9}~M_{\odot}$~yr$^{-1}$) for IRAS~16253$-$2429 from JWST observations (Watson et al. in prep), indicating that the protostar is in a quiescent accretion phase. Our results demonstrate that very low-mass protostars can drive highly collimated, atomic jets, even during the quiescent phase. |
| title | Discovery of a collimated jet from the low luminosity protostar IRAS 16253$-$2429 in a quiescent accretion phase with the JWST |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2310.14061 |