JWST Peers into the Class I Protostar TMC1A: Atomic Jet and Spatially Resolved Dissociative Shock Region

Abstract

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 {\it JWST} NIRSpec Integral Field Unit (IFU) observations of atomic and H${}_2$ lines from 1 -- 5.1 $\mu$m 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 $\mu$m along with corresponding extended H${}_2$ 2.12 $\mu$m emission. Towards the protostar, we detected spectrally broad H I and He I emissions with velocities up to 300 km/s that can be explained by a combination of protostellar accretion and a wide-angle wind. The 2$\mu$m 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 {\it 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.

arXiv commentAccepted for publication on ApJL, 10 pages, 6 figures including appendix

References in corpus (39)

• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The Spitzer c2d Legacy Results: Star Formation Rates and Efficiencies; Evolution and Lifetimes
• The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope I. Overview of the instrument and its capabilities
• The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
• Water in star-forming regions with Herschel (WISH): II. Evolution of 557 GHz 110-101 emission in low-mass protostars
• Probing T Tauri Accretion and Outflow with 1 Micron Spectroscopy
• On the formation of H-alpha line emission around classical T Tauri stars
• Mapping ices in protostellar environments on 1000 AU scales: Methanol-rich ice in the envelope of Serpens SMM 4
• Resolved images of a protostellar outflow launched by an extended disk wind
• Structure and kinematics of the Taurus star-forming region from Gaia-DR2 and VLBI astrometry
• Embedded Protostars in the Dust, Ice, and Gas In Time (DIGIT) Key Program: Continuum SEDs, and an Inventory of Characteristic Far-Infrared Lines from PACS Spectroscopy
• ALMA discovery of a rotating SO/SO${}_2$ flow in HH212. A possible MHD disk wind?
• Spitzer IRS Spectra and Envelope Models of Class I Protostars in Taurus
• Extreme Active Molecular Jets in L1448C
• APEX-CHAMP+ high-J CO observations of low-mass young stellar objects: IV. Mechanical and radiative feedback
• Episodic molecular outflow in the very young protostellar cluster Serpens South
• Origins of the H, He I, and Ca II Line Emission in Classical T Tauri Stars
• Evidence for the start of planet formation in a young circumstellar disk
• ALMA reveals a large structured disk and nested rotating outflows in DG Tau B
• Jets from Young Stars
• The jet and the disk of the HH 212 low-mass protostar imaged by ALMA: SO and SO2 emission
• Disks and Outflows in CO Rovibrational Emission from Embedded, Low-Mass Young Stellar Objects
• Origin of the wide-angle hot H2 in DG Tauri: New insight from SINFONI spectro-imaging
• A highly collimated, extremely high velocity outflow in Taurus
• Observational evidence for dissociative shocks in the inner 100 AU of low-mass protostars using Herschel-HIFI
• Interpreting Near Infrared Hydrogen Line Ratios in T Tauri Stars
• An extremely high velocity molecular jet surrounded by an ionized cavity in the protostellar source Serpens SMM1
• Wide-angle protostellar outflows driven by narrow jets in stratified cores
• c2d Spitzer IRS spectra of embedded low-mass young stars: gas-phase emission lines
• On the excitation of the infrared knots in the HH99 outflow
• Observations of the Brackett decrement in the Class I source HH100 IR
• Resolved molecular line observations reveal an inherited molecular layer in the young disk around TMC1A
• Nature of shocks revealed by SOFIA OI observations in the Cepheus E protostellar outflow
• Steady Wind-Blown Cavities within Infalling Rotating Envelopes: Application to the Broad Velocity Component in Young Protostars
• The He I $\lambda$10830 $\mathring{A}$ line as a probe of winds and accretion in young stars in Lupus and Upper Scorpius
• Mass ejection and time variability in protostellar outflows: Cep E. SOLIS XVI
• Atomic Shocks in the Outflow of L1551 IRS 5 Identified with SOFIA-upGREAT Observations of [OI]

Cited by in corpus (16)

• Investigating Protostellar Accretion-Driven Outflows Across the Mass Spectrum: JWST NIRSpec IFU 3-5~$\mu$m Spectral Mapping of Five Young Protostars
• JWST Observations of Young protoStars (JOYS): overview of program and early results
• JWST Observations of Young protoStars (JOYS): Linked accretion and ejection in a Class I protobinary system
• JWST Observations of Young protoStars (JOYS). Overview of gaseous molecular emission and absorption in low-mass protostars
• JWST study of the DG Tau B disk wind candidate: I -- Overview and Nested H${}_2$/CO outflows
• The Asymmetric Bipolar Fe II Jet and H2 Outflow of TMC1A Resolved with JWST's NIRSpec IFU
• A kinematical study of the launching region of the blueshifted HH 46/47 outflow with SINFONI K-band observations
• PROJECT-J: the shocking H2 outflow from HH46
• PENELLOPE VII: Revisiting empirical relations to measure accretion luminosity
• Externally irradiated young stars in NGC 3603. A JWST NIRSpec catalogue of pre-main-sequence stars in a massive star formation region
• UV-irradiated outflows from low-mass protostars in Ophiuchus with JWST/MIRI
• Molecular Jets from an Evolved Protostar: Insights from JWST-ALMA Synergy
• Sulfur oxides tracing streamers and shocks at low mass protostellar disk-envelope interfaces
• Kinematic evidence of magnetospheric accretion for Herbig Ae stars with JWST NIRSpec
• Mid-infrared extinction curve for protostellar envelopes from JWST-detected embedded jet emission: the case of TMC1A
• Jets in Low-Mass Protostars