Silica in Protoplanetary Disks

Details Silica in Protoplanetary Disks Silica in Protoplanetary Disks

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1006s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #10.06; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Mid-infrared spectra of a handful of Class II Young Stellar Objects taken using the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope show very prominent narrow emission features indicating silica (crystalline silicon dioxide). Silica is not believed to be a major constituent of the interstellar medium; therefore, any silica present in the circumstellar disks of Class II YSOs must be largely the result of processing of primitive dust material in the protoplanetary disks surrouding these stars. We model the silica features in our spectra using the opacities of various polymorphs of silica and amorphous versions thereof computed from earth-based laboratory measurements. This modeling suggests that the polymorphs of silica that form at high temperatures and low pressures are the dominant forms of silica in some Class II YSO disks. In turn, this constrains the locations within the disk and the physical processes involved in the thermal processing of dust grains. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. 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.

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