Correlating Mid-infrared Spectral Variability of Silicates, [Ne II], H, and H20 in Actively Accreting T Tauri Stars

Details Correlating Mid-infrared Spectral Variability of Silicates, [Ne II], H, and H20 in Actively Accreting T Tauri Stars Correlating Mid-infrared Spectral Variability of Silicates, [Ne II], H, and H20 in Actively Accreting T Tauri Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6212l&link_type=abstract

American Astronomical Society, AAS Meeting #211, #62.12; Bulletin of the American Astronomical Society, Vol. 39, p.849

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present Spitzer IRS data from a multi-epoch mid-infrared spectroscopic survey of 11 actively accreting T Tauri stars in Taurus-Auriga to investigate temporal variations of the gas and dust features residing between 5 and 14 µm. We detect [Ne II] fine structure emission at 12.81 μm as well as the H I (7-6) emission line at 12.37 μm in the transitional disks of GM Aur and DM Tau. Both the H I and neon emission features exhibit marginally detected variability in line flux with timescales on the order of days to weeks with their fluctuations appearing to be correlated. A correlation between these gas phase features suggests a common origin for their emission and have the potential to constrain the mechanisms responsible for stimulating the observed line emission. In addition, we detect a water vapor absorption band centered between 5.6 and 5.8 μm in the majority of our objects that varies on the timescale of months. We also report the detection of significant variability in the 10 μm silicate feature over a similar timescale in CW Tau, DG Tau, and XZ Tau. The high accretion rates previously measured for the sources in our survey suggest that the variations in these gas phase features as well as those of the silicate features may be due to fluctuations in the accretion luminosity, high energy photons incident upon the disk, and possible line-of-sight effects due to mixing in and rotation of the disks.

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