Disk Composition from Spectra
First Author:
Jeroen Bouwman
Email: bouwman AT mpia.de
MPIA Heidelberg
Koenigstuhl 17
Heidelberg D69117 Germany
Abstract
In this review I discuss IR spectroscopic observations with Spitzer of Herbig~Ae (HAE) and T~Tauri (TT) systems. These latter type of systems represent the final stage of pre-main-sequence evolution oflow and intermediate-mass stars ($\sim$0.1 to 2 solar masses). The disks in HAE and TT systems most likely representthe environment in and from which the formation of planets occur. Infrared Spectroscopy provides an unparalleled tool to study the composition, i.e. the mineralogy of the dust in protoplanetary disks and the processes that play a role in its evolution. These IR observations have revealed an incredible richness of solid state emission features characteristic for dust species such as amorphous silicates, crystalline silicates, iron oxide and sulfides, ices and Polycyclic Aromatic Hydrocarbon molecules. These emission features show systematic variations which can be correlated with the evolutionary processes of the circumstellar disk. To correctly interpret the rich IR spectroscopic data, comparisons to experimental and theoretical studies are required. In this review, therefore, I will extensively discuss the interplay between observations and experiments/theory.
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