High Resolution Spectroscopy of [NeII] Emission from AA Tau and GM Aur

Abstract

We present high resolution (R=80,000) spectroscopy of [NeII] emission from two young stars, GM Aur and AA Tau, which have moderate to high inclinations. The emission from both sources appears centered near the stellar velocity and is broader than the [NeII] emission measured previously for the face-on disk system TW Hya. These properties are consistent with a disk origin for the [NeII] emission we detect, with disk rotation (rather than photoevaporation or turbulence in a hot disk atmosphere) playing the dominant role in the origin of the line width. In the non-face-on systems, the [NeII] emission is narrower than the CO fundamental emission from the same sources. If the widths of both diagnostics are dominated by Keplerian rotation, this suggests that the [NeII] emission arises from larger disk radii on average than does the CO emission. The equivalent width of the [NeII] emission we detect is less than that of the spectrally unresolved [NeII] feature in the Spitzer spectra of the same sources. Variability in the [NeII] emission or the mid-infrared continuum, a spatially extended [NeII] component, or a very (spectrally) broad [NeII] component might account for the difference in the equivalent widths.

Accepted for publication in ApJ

References in corpus (16)

• Magnetospheric accretion-ejection processes in the classical T Tauri star AA
• Spectro-astrometric imaging of molecular gas within protoplanetary disk gaps
• Demographics of Transition Objects
• Line Emission from Gas in Optically Thick Dust Disks around Young Stars
• Evidence for Disk Photoevaporation Driven by the Central Star
• Spitzer observations of HH54 and HH7-11: mapping the H2 ortho-to-para ratio in shocked molecular gas
• c2d Spitzer IRS Spectra of Disks around T Tauri Stars. III. [Ne II], [Fe I], and H_2 gas-phase lines
• Probing the Dust and Gas in the Transitional Disk of CS Cha with Spitzer
• Neon Fine-Structure Line Emission By X-ray Irradiated Protoplanetary Disks
• High spatial resolution mid-infrared observations of the low-mass young star TW Hya
• The Origins of Fluorescent H2 Emission From T Tauri~Stars
• [NeII] emission line profiles from photoevaporative disc winds
• High-resolution Spectroscopy of [Ne II] Emission from TW Hya
• Atomic Diagnostics of X-ray Irradiated Protoplanetary Disks
• An outflow origin of the [NeII] emission in the T Tau triplet
• CO Fundamental Emission from V836 Tau

Cited by in corpus (31)

• Radiation-Hydrodynamic Models of X-Ray & EUV Photoevaporating Protoplanetary Discs
• Evidence for Disk Photoevaporation Driven by the Central Star
• A Hubble Space Telescope Survey of H2 Emission in the Circumstellar Environments of Young Stars
• Diagnostic Line Emission from EUV and X-ray Illuminated Disks and Shocks around Low Mass stars
• The Atomic and Molecular Content of Disks Around Very Low-mass Stars and Brown Dwarfs
• Spitzer Spectroscopy of the Transition Object TW Hya
• On the origin of [NeII] 12.81 micron emission from pre-main sequence stars: Disks, jets, and accretion
• Theoretical spectra of photoevaporating protoplanetary discs: An atlas of atomic and low-ionisation emission lines
• Herschel/PACS Survey of protoplanetary disks in Taurus/Auriga -- Observations of [OI] and [CII], and far infrared continuum
• High resolution spectroscopy of Ne II emission from young stellar objects
• The Evolution of Disk Winds from a Combined Study of Optical and Infrared Forbidden Lines
• Low EUV Luminosities Impinging on Protoplanetary Disks
• Disks and Outflows in CO Rovibrational Emission from Embedded, Low-Mass Young Stellar Objects
• FUV and X-ray irradiated protoplanetary disks: a grid of models I. The disk structure
• Transition disks: the observational revolution from SEDs to imaging
• Imaging the photoevaporating disk and radio jet of GM Aur
• A new raytracer for modeling AU-scale imaging of lines from protoplanetary disks
• FUV and X-ray irradiated protoplanetary disks: a grid of models II - Gas diagnostic line emission
• On the origin of [Ne II] emission in young stars: mid-infrared and optical observations with the Very Large Telescope
• Herschel evidence for disk flattening or gas depletion in transitional disks
• Characterizing CO Fourth Positive Emission in Young Circumstellar Disks
• Tracing High-Energy Radiation from T Tauri Stars Using Mid-Infrared Neon Emission from Disks
• Searching for gas emission lines in Spitzer Infrared Spectrograph (IRS) spectra of young stars in Taurus
• CO and H2 Absorption in the AA Tauri Circumstellar Disk
• Fine-Structure Line Emission from the Outflows of Young Stellar Objects
• Near-IR Molecular Hydrogen Emission of Protostars: Probing Circumstellar Environments
• Observational Constraints on the Stellar Radiation Field Impinging on Transitional Disk Atmospheres
• Testing protoplanetary disc dispersal with radio emission
• Effects of X-ray irradiation and disk flaring on the [NeII] 12.8 micron emission from young stellar objects
• The gas disk: Evolution and chemistry
• Revealing Ionization Conditions of Sz 102 with Spatially Resolved [Ne III] Microjets