JOYS: Launching and destruction of dust in protostellar jets. The case of BHR71-IRS1 with JWST/MIRI
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| author | Tychoniec, Łukasz Francis, Logan Navarro, Maria Gabriela Vorster, Jakobus M. van Dishoeck, Ewine F. Garatti, Alessio Caratti o Assani, Korash Gouellec, Valentin J. M. Le Tabone, Benoît Klaassen, Pamela Janssen, Adriaan G. M. Justtanont, Kay Harsono, Daniel Nazari, Pooneh Reyes, Simon Slavicinska, Katerina Gieser, Caroline Bourke, Tyler Yang, Yao-Lun Nisini, Brunella Giannini, Teresa Beuther, Henrik Devaraj, R. Ray, Thomas P. Brunken, Nashanty G. C. Chen, Yuan van Gelder, Martijn L. |
| author_facet | Tychoniec, Łukasz Francis, Logan Navarro, Maria Gabriela Vorster, Jakobus M. van Dishoeck, Ewine F. Garatti, Alessio Caratti o Assani, Korash Gouellec, Valentin J. M. Le Tabone, Benoît Klaassen, Pamela Janssen, Adriaan G. M. Justtanont, Kay Harsono, Daniel Nazari, Pooneh Reyes, Simon Slavicinska, Katerina Gieser, Caroline Bourke, Tyler Yang, Yao-Lun Nisini, Brunella Giannini, Teresa Beuther, Henrik Devaraj, R. Ray, Thomas P. Brunken, Nashanty G. C. Chen, Yuan van Gelder, Martijn L. |
| contents | Protostellar winds can theoretically lift solids from the planet-forming disks, but direct evidence for launched dust has been scarce so far. Numerous atomic lines that are unique to mid-infrared (IR) wavelengths reveal refractories eroded from dust grains and provide information on wind properties in the earliest stages of the star formation process. We present JWST/MIRI-MRS spectral imaging of the inner 2000 au of the BHR71-IRS1 blueshifted side of the outflow. Atomic line intensities are compared to shock models to constrain the physical conditions and elemental abundances of the outflowing gas. Dust continuum maps are constructed from PSF-subtracted cubes, and the dust spectral energy distribution is analyzed. The ionized central jet of BHR71-IRS1 is spatially resolved and imaged for the first time, revealing a unique inventory of refractory, volatile, and noble-gas fine-structure lines (Fe, Ni, Co, Cl, S, Ne, Ar). The emission is concentrated along four bright knots that wiggle along the jet axis. PSF-subtracted continuum maps reveal extended mid-IR continuum emission co-spatial with the jet bullets and within the H$_2$-traced outflow cone. Spectral energy distributions along the jet are fit together with the extinction, revealing a warm (200-400 K) and a cold (70-90 K) dust component. Shock modeling constrained by the mid-IR lines indicates a decline in shock velocity from 70 to 35 km s$^{-1}$ and pre-shock density from $>$10$^5$ to $ 4\times 10^4$ cm$^{-3}$ with distance from the protostar. Gas-phase Fe and Ni are measurably depleted relative to Solar abundances, consistent with a substantial fraction of refractories remaining locked in grains in spite of the shocks. These JWST observations provide direct evidence that dust is launched in a Class 0 jet and at least partly survives shock processing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_11904 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | JOYS: Launching and destruction of dust in protostellar jets. The case of BHR71-IRS1 with JWST/MIRI Tychoniec, Łukasz Francis, Logan Navarro, Maria Gabriela Vorster, Jakobus M. van Dishoeck, Ewine F. Garatti, Alessio Caratti o Assani, Korash Gouellec, Valentin J. M. Le Tabone, Benoît Klaassen, Pamela Janssen, Adriaan G. M. Justtanont, Kay Harsono, Daniel Nazari, Pooneh Reyes, Simon Slavicinska, Katerina Gieser, Caroline Bourke, Tyler Yang, Yao-Lun Nisini, Brunella Giannini, Teresa Beuther, Henrik Devaraj, R. Ray, Thomas P. Brunken, Nashanty G. C. Chen, Yuan van Gelder, Martijn L. Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies Protostellar winds can theoretically lift solids from the planet-forming disks, but direct evidence for launched dust has been scarce so far. Numerous atomic lines that are unique to mid-infrared (IR) wavelengths reveal refractories eroded from dust grains and provide information on wind properties in the earliest stages of the star formation process. We present JWST/MIRI-MRS spectral imaging of the inner 2000 au of the BHR71-IRS1 blueshifted side of the outflow. Atomic line intensities are compared to shock models to constrain the physical conditions and elemental abundances of the outflowing gas. Dust continuum maps are constructed from PSF-subtracted cubes, and the dust spectral energy distribution is analyzed. The ionized central jet of BHR71-IRS1 is spatially resolved and imaged for the first time, revealing a unique inventory of refractory, volatile, and noble-gas fine-structure lines (Fe, Ni, Co, Cl, S, Ne, Ar). The emission is concentrated along four bright knots that wiggle along the jet axis. PSF-subtracted continuum maps reveal extended mid-IR continuum emission co-spatial with the jet bullets and within the H$_2$-traced outflow cone. Spectral energy distributions along the jet are fit together with the extinction, revealing a warm (200-400 K) and a cold (70-90 K) dust component. Shock modeling constrained by the mid-IR lines indicates a decline in shock velocity from 70 to 35 km s$^{-1}$ and pre-shock density from $>$10$^5$ to $ 4\times 10^4$ cm$^{-3}$ with distance from the protostar. Gas-phase Fe and Ni are measurably depleted relative to Solar abundances, consistent with a substantial fraction of refractories remaining locked in grains in spite of the shocks. These JWST observations provide direct evidence that dust is launched in a Class 0 jet and at least partly survives shock processing. |
| title | JOYS: Launching and destruction of dust in protostellar jets. The case of BHR71-IRS1 with JWST/MIRI |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2604.11904 |