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Published November 20, 2007 | Published
Journal Article Open

High-resolution spectroscopy of [Ne II] emission from TW Hydrae


We present high-resolution echelle spectra of [Ne II] 12.81 μm emission from the classical T Tauri star (CTTS) TW Hya, obtained with MICHELLE on Gemini North. The line is centered at the stellar radial velocity and has an intrinsic FWHM of 21 ± 4 kms^-1. The line width is broader than other narrow emission lines typically associated with the disk around TW Hya. If formed in a disk, the line broadening could result from turbulence in a warm disk atmosphere, Keplerian rotation at an average distance of 0.1 AU from the star, or a photoevaporative flow from the optically thin region of the disk. We place upper limits on the [Ne II] emission flux from the CTTSs DP Tau and BP Tau.

Additional Information

© 2007 The American Astronomical Society. Received 2007 April 19; accepted 2007 June 26. We thank the anonymous referee for helpful comments that improved the clarity of the discussion. This observing time was awarded by Caltech as part of the Keck/Gemini exchange program. We thank Kevin Volk for observing support with MICHELLE during the run and for helping to identify the atmospheric lines with ATRAN. We thank Andrew Pickles for observing TW Hya during the recommissioning of the East Arm Echelle Spectrograph. We thank David Hollenbach for discussing the application of photoevaporation models to the [Ne II] line.

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Published - HERapj07.pdf


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