Revealing Ionization Conditions of Sz 102 with Spatially Resolved [Ne III] Microjets

Abstract

Forbidden neon emission lines from small-scale microjets can probe high-energy processes in low-mass young stellar systems. We obtained spatially resolved [Ne III] spectra of the microjets from the classical T Tauri Star Sz 102 using the Hubble Space Telescope Imaging Spectrograph (HST/STIS) at a spatial resolution of ~0".1. The blueshifted and redshifted [Ne III] emission both peak in intensity within ~0".1 of the star and gradually decay along the flow outward to ~0".24. The spatial distribution and extent of the [Ne III] microjet is consistent with a jet that is ionized close to the base and subsequently recombines on a longer timescale than the flow time. Ca II H and K lines are also detected from the redshifted microjet with a line full-width at half-maximum of ~170 km/s, consistent with those of other forbidden emission lines, atop a 300-km/s wide stellar component. The launching radius of the Sz 102 jet, inferred from the observed line centroids and the range of inclination angles and stellar masses from the literature, is on the order of ~0.03 au. The possible proximity of the launching region to the star allows immediate ionization without distance dilution from the circumstellar ionization sources, most likely keV X-ray flares generated by magnetic reconnection events in the star-disk system, to sustain the observed [Ne III] flux.

16 pages, 10 figures, 2 tables; accepted by ApJ

References in corpus (18)

• c2d Spitzer IRS Spectra of Disks around T Tauri Stars. III. [Ne II], [Fe I], and H_2 gas-phase lines
• An ALMA Survey of CO isotopologue emission from Protoplanetary Disks in Chamaeleon I
• Neon Fine-Structure Line Emission By X-ray Irradiated Protoplanetary Disks
• Discovery of a bipolar X-ray jet from the T Tauri star DG Tau
• T Tauri Jet Physics Resolved Near The Launching Region with the Hubble Space Telescope
• X-rays from jet-driving protostars and T Tauri stars
• [NeII] emission line profiles from photoevaporative disc winds
• High-resolution Spectroscopy of [Ne II] Emission from TW Hya
• Low EUV Luminosities Impinging on Protoplanetary Disks
• The nature of the soft X-ray source in DG Tau
• Revealing the fastest component of the DG Tau outflow through X-rays
• ESO-H$\alpha$~574 and Par-Lup3-4 Jets: Exploring the spectral, kinematical and physical properties
• ALMA observations of the Th 28 protostellar disk - A new example of counter-rotation between disk and optical jet
• Fine-Structure Line Emission from the Outflows of Young Stellar Objects
• Recollimation boundary layers as X-ray sources in young stellar jets
• The [Ne III] Jet of DG Tau and its Ionization Scenarios
• Velocity-Resolved [Ne III] from X-Ray Irradiated Sz 102 Microjets
• Predicting the time variation of radio emission from MHD simulations of a flaring T-Tauri star

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• Accretion and Outflows in Young Stars with CUBES
• Investigating the asymmetry of young stellar outflows: Combined MUSE-X-shooter study of the Th 28 jet
• The accretion-ejection connection in the asymmetric Th 28 jet revealed by MUSE-NFM