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Dust Processing and Grain Growth in Protoplanetary Disks in the Taurus-Auriga Star-Forming Region
B. A. Sargent, W. J. Forrest, C. Tayrien +9
Mid-infrared spectra of 65 T Tauri stars (TTS) taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope are modeled using dust at two temperatures to probe t…
Silica in Protoplanetary Disks
B. A. Sargent, W. J. Forrest, C. Tayrien +10
Mid-infrared spectra of a few T Tauri stars (TTS) taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope show prominent narrow emission features indicating…
On Dust Extinction of Gamma-ray Burst Host Galaxies
Aigen Li, S. L. Liang, D. A. Kann +3
Although it is well recognized that gamma-ray burst (GRB) afterglows are obscured and reddened by dust in their host galaxies, the wavelength-dependence and quantity of dust extinc…
The relations among 8, 24, and 160 micron dust emission within nearby spiral galaxies
G. J. Bendo, B. T. Draine, C. W. Engelbracht +9
We investigate the relations among the stellar continuum-subtracted 8 micron polycyclic aromatic hydrocarbon (PAH 8 micron) emission, 24 micron hot dust emission, and 160 micron co…
Variations in 24 micron morphologies among galaxies in the Spitzer Infrared Nearby Galaxies Survey: New insights into the Hubble sequence
G. J. Bendo, D. Calzetti, C. W. Engelbracht +7
To study the distribution of star formation and dust emission within nearby galaxies, we measured five morphological parameters in the 3.6 and 24 micron wave bands for 65 galaxies…
The Dust and Gas Around beta Pictoris
C. H. Chen, A. Li, C. Bohac +12
We have obtained Spitzer IRS 5.5 - 35 micron spectroscopy of the debris disk around beta Pictoris. In addition to the 10 micron silicate emission feature originally observed from t…