Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-06-26
Astronomy and Astrophysics
Astrophysics
Accepted by ApJ. 18 pages, including 2 figures and 2 tables
Scientific paper
10.1086/521545
We present high-resolution echelle spectra of [Ne II] 12.81 micron 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\pm 4 km/s. 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.
Herczeg Gregory J.
Hillenbrand Lynne A.
Najita Joan
Pascucci Ilaria
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