The IRS Spectra of Weak-line T Tauri Stars

Details The IRS Spectra of Weak-line T Tauri Stars The IRS Spectra of Weak-line T Tauri Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5013c&link_type=abstract

American Astronomical Society, AAS Meeting #211, #50.13; Bulletin of the American Astronomical Society, Vol. 39, p.813

Astronomy and Astrophysics

Astronomy

Scientific paper

Weak-line T Tauri stars (WTTSs) are low-mass pre-main-sequence stars that are not longer accreting. Recent Spitzer studies have shown that only 20% of the WTTSs in nearby star-forming regions have circumstellar disks detectable at 24 micron or shorter wavelengths. However, the Spectral Energy distributions (SEDs) of the few WTTSs that do have a disk show a wide range of morphologies that can be interpreted in terms of an evolutionary sequence of disk dissipation and dust aggregation, linking classical T Tauri Star (CTTS) disks with debris disks. We use Infrared Spectrograph data from the Spitzer archive to characterize the mid-IR spectra of WTTS disks and compare them to those of CTTS disks. The dense SED sampling of the IRS spectra allow us to study the structure of the disk in much more detail that is possible with Spitzer photometry alone. Also, the IRS data allow us to investigate the connection between circumstellar dust properties, such as grain growth and crystallinity, and the structure of the disk.

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