JWST Observations of Young protoStars (JOYS) Linked accretion and ejection in a Class I protobinary system

Autor(en): Łukasz Tychoniec, Martijn L. van Gelder, Ewine F. van Dishoeck, Logan Francis, Will R.M. Rocha, Alessio Caratti O. Garatti, Henrik Beuther, Caroline Gieser, Kay Justtanont, Harold Linnartz, Valentin J.M. Le Gouellec, Giulia Perotti, Rangaswamy Devaraj, Benoît Tabone, Thomas P. Ray, Nashanty G.C. Brunken, Yuan Chen, Patrick J. Kavanagh, Pamela Klaassen, Katerina Slavicinska, Manuel Güdel, Goran Östlin
Abstrakt: Context. Accretion and ejection dictate the outcomes of star and planet formation processes. The mid-infrared (MIR) wavelength range offers key tracers of processes that have been difficult to detect and spatially resolve in protostars until now. Aims. We aim to characterize the interplay between accretion and ejection in the low-mass Class I protobinary system TMC1, comprising two young stellar objects: TMC1-W and TMC1-E at a 85 au separation. Methods. Using the James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) observations in 5–28 µm range, we measured the intensities of emission lines of H₂, atoms, and ions, for instance, the [Fe II] and [Ne II], and HI recombination lines. We analyzed the spatial distribution of the different species using the MIRI Medium Resolution Spectrometer (MRS) capabilities to spatially resolve emission at 0^'.́2–0^'.́7 scales. we compared these results with the corresponding Atacama Large Millimeter/submillimeter Array (ALMA) maps tracing cold gas and dust. Results. We detected H₂ outflow coming from TMC1-E, with no significant H₂ emission from TMC1-W. The H₂ emission from TMC1-E outflow appears narrow and extends to wider opening angles with decreasing E_up from S(8) to S(1) rotational transitions, indicating the disk wind as its origin. The outflow from TMC1-E protostar shows spatially extended emission lines of [Ne II], [Ne III], [Ar II], and [Ar III], with their line ratios consistent with UV radiation as a source of ionization. With ALMA, we detected an accretion streamer infalling from >1000 au scales onto the TMC1-E component. The TMC1-W protostar powers a collimated jet, detected with [Fe II] and [Ni II], making it consistent with energetic flow. A much weaker ionized jet is observed from TMC1-E, and both jets appear strikingly parallel to each other, indicating that the disks are co-planar. TMC1-W is associated with strong emission from hydrogen recombination lines, tracing the accretion onto the young star. Conclusions. MIRI-MRS observations provide an unprecedented view of protostellar accretion and ejection processes on 20 au scales. Observations of a binary Class I protostellar system show that the two processes are clearly intertwined, with accretion from the envelope onto the disk influencing a wide-angle wind ejected on disk scales. Finally, the accretion from the protostellar disk onto the protostar is associated with the source launching a collimated high-velocity jet within the innermost regions of the disk.
Organisation(en): Institut für Astrophysik
Externe Organisation(en): Leiden University, European Southern Observatory (Germany), Max-Planck-Institut für extraterrestrische Physik, INAF-Osservatorio Astronomico di Capodimonte, Max-Planck-Institut für Astronomie, Chalmers University of Technology, NASA Ames Research Center, Dublin Institute for Advanced Studies, Université Paris XI - Paris-Sud, Université Paris Saclay, National University of Ireland, Maynooth, The Royal Observatory, Edinburgh, Eidgenössische Technische Hochschule Zürich, Oskar Klein Centre
Journal: Astronomy and Astrophysics
Band: 687
Anzahl der Seiten: 17
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202348889
Publikationsdatum: 07-2024
Peer-reviewed: Ja
ÖFOS 2012: 103003 Astronomie, 103004 Astrophysik
Schlagwörter
ASJC Scopus Sachgebiete: Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/2f8a6296-bc6b-425b-9a78-1ae21c96b2e6

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