UV-Visible Laboratory Spectra Of Presolar Oxide And CAI Analogs: Corundum, Spinel, Hibonite, And Melilites

Details UV-Visible Laboratory Spectra Of Presolar Oxide And CAI Analogs: Corundum, Spinel, Hibonite, And Melilites UV-Visible Laboratory Spectra Of Presolar Oxide And CAI Analogs: Corundum, Spinel, Hibonite, And Melilites

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932001p&link_type=abstract

American Astronomical Society, AAS Meeting #219, #320.01

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There is a paucity of UV-visible wavelength spectra and optical (dielectric) functions for important interstellar and circumstellar dust species. Whereas the isotopic properties and infrared spectral signatures of some oxide compounds have been well studied in astronomy, it is critical to extend the wavelength coverage as shortward as possible to calculate the temperature of dust and properly account for the energy budget in radiative transfer calculations of many astronomical environments. In this work, we will present the spectral behavior of selected oxides that have been found as presolar grains or calcium-aluminum inclusions (CAIs) in meteorites, covering the mid-UV to HST wavelength range (λ =190-1100 nm). We focus on corundum (Al2O3), spinel (MgAl2O4), and hibonite ((Ca,Ce)(Al,Ti,Mg)12O19) as the main analogs to the phases occurring in CAIs within primitive chondritic meteorites that condensed from the early solar nebula. We also present new UV-vis data for Ca- and Al-endmember melilites, which are early (high-temperature/pressure) condensation sequence products. Whereas Mg and Fe silicates are expected to dominate if dust formation goes to equilibrium, the high-temperature Ca-Al condensates are important for non-equilibrium processes. Collectively, these new UV-vis data have potential applications for observational and modeling studies of red giants and supergiants, AGB stars, protoplanetary disks, and SN. This work is supported through NSF AST-1009544.

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