Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0701s&link_type=abstract
American Astronomical Society Meeting 208, #7.01; Bulletin of the American Astronomical Society, Vol. 38, p.85
Other
Scientific paper
The 8-14 micron spectra of about 100 T Tauri stars in the Taurus/Auriga star-forming region obtained with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope are analyzed. From these high quality spectra, the 8-14 micron dust emissivity for each object is derived, assuming the 10 micron emission features originate from silicate grains in the optically thin surface layers of the T Tauri disks. The emissivities are fit with opacities of laboratory analogs of cosmic dust. The fits include small nonspherical grains of amorphous silicates, crystalline silicates (forsterite and pyroxene), quartz, and large fluffy amorphous silicate grains. A wide range in the fraction of crystalline silicate grains as well as large grains amongst these 1-3 Myr old stars is found. The dust in the transitional-disk objects CoKu Tau/4, GM Aur, and DM Tau tends to have the simplest form of silicates, with almost no hint of crystalline components and modest amounts of large grains. The 10 micron silicate emission features of the transitional-disk objects are very similar to that of the mass-losing supergiant Mu Ceph and also to the 10 micron ISM absorption feature measured along the line-of-sight to the Galactic Center. This indicates that the dust grains in the transitional-disk objects have been modified little from their origin in the interstellar medium. The relations of the mass fractions of the various dust components to stellar parameters as well as to the mass fractions of other dust components are explored. Support for this work was provided by NASA through contract number 1257184 issued by JPL/Caltech, JPL contract 960803 to Cornell University, and Cornell subcontracts 31419-5714 to the University of Rochester. Aigen Li acknowledges support from the University of Missouri Summer Research Fellowship, the University of Missouri Research Board, and the NASA award P20436.
Calvet Nuria
D'Alessio Paola
Forrest William John
Furlan Elise
Green David J.
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