High-resolution [O I] line spectral mapping of TW Hya supportive of a magnetothermal wind

Abstract

Disk winds are thought to play a critical role in the evolution and dispersal of protoplanetary disks. A primary diagnostic of this physics is emission from the wind, especially in the low-velocity component of the [O I] $\lambda 6300$ line. However, the interpretation of the line is usually based on spectroscopy alone, which leads to confusion between magnetohydrodynamic winds and photoevaporative winds. Here we report that in high-resolution spectral mapping of TW Hya by the multi-unit spectroscopic explorer at the Very Large Telescope, 80% of the [O I] emission is confined to within 1 AU radially from the star. A generic model of a magnetothermal wind produces [O I] emission at the base of the wind that broadly matches the flux and the observed spatial and spectral profiles. The emission at large radii is much fainter that predicted from models of photoevaporation, perhaps because the magnetothermal wind partially shields the outer disk from energetic radiation from the central star. This result calls into question the previously assessed importance of photoevaporation in disk dispersal predicted by models.

Published in Nature Astronomy

References in corpus (20)

• Photoevaporation of protoplanetary discs II: evolutionary models and observable properties
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• Which jet launching mechanism(s) in TTauri stars?
• The Data Processing Pipeline for the MUSE Instrument
• The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection
• Photoevaporation of protoplanetary discs I: hydrodynamic models
• Global Simulations of the Inner Regions of Protoplanetary Disks with Comprehensive Disk Microphysics
• CO and dust properties in the TW Hya disk from high-resolution ALMA observations
• Line Emission from Gas in Optically Thick Dust Disks around Young Stars
• Tracing Slow Winds from T Tauri Stars via Low Velocity Forbidden Line Emission
• X-Shooter spectroscopy of young stellar objects: V - Slow winds in T Tauri stars
• Hall-effect Mediated Magnetic Flux Transport in Protoplanetary Disks
• Hydrodynamic Photoevaporation of Protoplanetary Disks with Consistent Thermochemistry
• A measure of the size of the magnetospheric accretion region in TW Hydrae
• Spectropolarimetry of the Classical T Tauri Star TW Hydrae
• Evidence for an MHD disk wind via optical forbidden line spectro-astrometry
• An Improved HR Diagram for the Orion Trapezium Cluster
• Forbidden emission lines in protostellar outflows and jets with MUSE
• A MUSE view of the asymmetric jet from HD 163296
• Discovery of a jet from the single HAe/Be star HD 100546

Cited by in corpus (7)

• Modeling JWST MIRI-MRS Observations of T Cha: Mid-IR Noble Gas Emission Tracing a Dense Disk Wind
• High-resolution [OI] line spectral mapping of TW Hya consistent with X-ray driven photoevaporation
• Disk Cooling and Wind Lines As Seen In the Spectral Line Evolution of V960 Mon
• Photoevaporation Can Reproduce Extended ${\mathrm{H}}_2$ Emission from Protoplanetary Disks Imaged by JWST MIRI
• On the diversification and dissipation of protoplanetary disks
• Forbidden Emission Line spectro-imaging of the RU Lupi jet and Low Velocity Component
• Photoevaporation from Inner Protoplanetary Disks Confronted with Observations