Presented at AAS meeting, Washington DC Jan 2010 Laboratory Spectroscopy in Herschel/PACS Range of Astrophysically Important Minerals Tatiana Brusentsova, Doug Maukonen, Pedro Figueiredo, Himanshu Saxena, Robert E. Peale Andy Nissinboim, Joseph Boesenberg, Julie Leibold, Kristen Sherman George E. Harlow , Denton Ebel Karl Hibbitts and Carey Lisse Astro-relevant minerals high-T (>1000K) predictions from condensation calculations minerals found in carbonaceous chondrite meteorites minerals interpreted from Spitzer/Deep Impact spectrum, found in Stardust samples and in IDPs minerals found in differentiated meteorites and planets minerals reported in astronomical spectroscopy Lab measurements support PACS data analysis Thermal emission: 4 c () e0() d e0() = Planck function = (S/m) ln (1/T) = mass absorption coef. S = sample cross-section m = mass in sample T = transmittance spectrum Physical Characterization Select grains from AMNH mineral collection Crush to separate intergrowths Sweep magnetic impurities Dissolve carbonate impurities in HCl (acid) Hand pick clean grains Verify crystallography (single crystal x-ray) Electron microprobe on single grains Chemical composition Cation stoichiometry Make dust
Number of particles Pellet preparation and spectroscopy 100 50 micronizing mill 0 Stokes settling grain size distribution Cerussite 1 cerussite 2 3 4 5 6 Particle diameter (micron) 20 microns Weigh and mix in polyethylene powder Melt press to pellets Fourier transform spectrometer: 14-250 microns Disseminate results Planetary Data System, Cross-referenced Curation of all samples at AMNH Samples Pellets All data Carbonates: Calcite & Dolomite group PACS 185 155 117 79 263 - 220 259 166 154 - 100 0 Ca0.78Mn1.13(CO3)2 kutnohorite 40 20
300 400 -1 Wavenumber (cm ) 500 150 Minerals Sampled Nesosilicates: Olivines, Garnets, Phenakites Silica minerals Inosilicates: Pyroxenes (Clino- and Ortho-), Pyroxenoids Feldspars: Alkali and Plagioclase Double-chain silicates: Amphiboles (Orthorhombic, Calcic clino-) Cyclosilicates Carbonates: Calcites, Aragonites, Dolomites, hydroxylated, Hydrated-normal, acid Phyllosilicates: Smectites, Chlorites, Micas, Kaolinites, Serpentines, Talcs Sorosilicates Oxides Sulfides Applications Early PACS report: 69 m feature due to olivine. True? We find no olivine feature there. Simulation of dust emission spectrum Linear superposition of absorbance for (e.g.) 38% water ice, 22% forsterite, 22% orthopyroxene (Mg-rich end member), 8% pyrrohtite, 5% talc or nontronite, 2.5% magnesite, and 2.5% siderite Summary Laboratory far-IR absorption spectroscopy of 150 well-characterized minerals Spectral signatures found in the range of Herschel-PACS for 40 No features ever found beyond ~140 m Funding: NASA-JPL
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