JWST Peers into the Class I Protostar TMC1A: Atomic Jet and Spatially Resolved Dissociative Shock Region
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JWST Peers into the Class I Protostar TMC1A : Atomic Jet and Spatially Resolved Dissociative Shock Region. / Harsono, D.; Bjerkeli, P.; Ramsey, J. P.; Pontoppidan, K. M.; Kristensen, L. E.; Jørgensen, J. K.; Calcutt, H.; Li, Z. Y.; Plunkett, A.
I: Astrophysical Journal Letters, Bind 951, Nr. 2, L32, 10.07.2023.Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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TY - JOUR
T1 - JWST Peers into the Class I Protostar TMC1A
T2 - Atomic Jet and Spatially Resolved Dissociative Shock Region
AU - Harsono, D.
AU - Bjerkeli, P.
AU - Ramsey, J. P.
AU - Pontoppidan, K. M.
AU - Kristensen, L. E.
AU - Jørgensen, J. K.
AU - Calcutt, H.
AU - Li, Z. Y.
AU - Plunkett, A.
N1 - Publisher Copyright: © 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/7/10
Y1 - 2023/7/10
N2 - Outflows and winds launched from young stars play a crucial role in the evolution of protostars and the early stages of planet formation. However, the specific details of the mechanism behind these phenomena, including how they affect the protoplanetary disk structure, are still debated. We present JWST NIRSpec integral field unit observations of atomic and H2 lines from 1 to 5.1 μm toward the low-mass protostar TMC1A. For the first time, a collimated atomic jet is detected from TMC1A in the [Fe ii] line at 1.644 μm along with corresponding extended H2 2.12 μm emission. Toward the protostar, we detected spectrally broad H i and He i emissions with velocities up to 300 km s−1 that can be explained by a combination of protostellar accretion and a wide-angle wind. The 2 μm continuum dust emission, H i, He i, and O i all show emission from the illuminated outflow cavity wall and scattered line emission. These observations demonstrate the potential of JWST to characterize and reveal new information about the hot inner regions of nearby protostars; in this case, a previously undetected atomic wind and ionized jet in a well-known outflow.
AB - Outflows and winds launched from young stars play a crucial role in the evolution of protostars and the early stages of planet formation. However, the specific details of the mechanism behind these phenomena, including how they affect the protoplanetary disk structure, are still debated. We present JWST NIRSpec integral field unit observations of atomic and H2 lines from 1 to 5.1 μm toward the low-mass protostar TMC1A. For the first time, a collimated atomic jet is detected from TMC1A in the [Fe ii] line at 1.644 μm along with corresponding extended H2 2.12 μm emission. Toward the protostar, we detected spectrally broad H i and He i emissions with velocities up to 300 km s−1 that can be explained by a combination of protostellar accretion and a wide-angle wind. The 2 μm continuum dust emission, H i, He i, and O i all show emission from the illuminated outflow cavity wall and scattered line emission. These observations demonstrate the potential of JWST to characterize and reveal new information about the hot inner regions of nearby protostars; in this case, a previously undetected atomic wind and ionized jet in a well-known outflow.
U2 - 10.3847/2041-8213/acdfca
DO - 10.3847/2041-8213/acdfca
M3 - Letter
AN - SCOPUS:85164932984
VL - 951
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L32
ER -
ID: 360813560