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  • 1
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    Physical and chemical evolution of reduced organic matter in the ISM (1995)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Icy mantles on interstellar grains have been a topic of study in airborne astronomy. Recent laboratory analog studies of the yield of organic residue from UV photolyzed ices have shown that this mechanism can be the most significant source of complex reduced organic matter in the interstellar medium. However, the total yield is a function of the occurrence of heating events that evaporate the ice, i.e. T is greater than 130 K, and the mechanism for such events is debated. Recently, we proposed that the recombination of radicals in the ice does not need high temperature excursions and, instead, occurs during a structural transformation of water ice at temperatures in the range 38 - 68 K.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific, Airborne Astronomy Symposium on the Galactic Ecosystem: From Gas to Stars to Dust, Volume 73; p 71-74
    Format: text
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  • 2
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    The nature and origin of interstellar diamond (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The C-delta component of the Allende meteorite is a microscopic diamond some of whose properties seem in conflict with those expected of diamond. High spatial resolution analytical data are presented here which may help explain such results. Surface and interfacial carbon atoms in the component, which may comprise as much as 25 percent of the total, impart an 'amorphous' character to some spectral data. These data support the proposed high-pressure conversion of amorphous carbon and graphite into diamonds due to grain-grain collisions in the ISM, although a low-pressure mechanism of formation cannot be ruled out.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 332; 611-613
    Format: text
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  • 3
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    Machine Learning Approaches to Data Reduction from the MapX X-ray Fluorescence Instrument for Detection of Biosignatures and Habitable Planetary Environments (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-28
    Description: The search for evidence of life or its processes involves the detection of biosignatures suggestive of extinct or extant life, or the determination that an environment either has or once had the potential to harbor life. In situ elemental imaging is useful in either case, since features on the mm to m scale reveal geological processes which may indicate past or present habitability. The Mapping X-ray Fluorescence Spectrometer (MapX) is an in-situ instrument designed to identify these features on planetary surfaces. Here we present progress on instrument development, data analysis methods, and element quantification.
    Keywords: Exobiology
    Type: ARC-E-DAA-TN69591 , AbSciCon 2019; Jun 24, 2019 - Jun 28, 2019; Bellevue, WA; United States
    Format: application/pdf
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  • 4
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    Occurrence and Forms of Water and Ice on the Earth and Beyond, and the Origin(s) of Life (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The natural history of the biogenic elements (H,C,O,N) from their first association within cold molecular clouds to their delivery to the Earth during the late bombardment of the inner solar system, is intimately linked to water ice. The earliest organic compounds are formed in cold interstellar molecular clouds as a result of UV and thermal processing of sub-micrometer ice grains which contain trapped carbon and nitrogen molecules. Structural changes in the water ice host underlie and fundamentally control important macroscopic phenomena such as the outgassing of volatiles, the rates of chemical reactions, and processing and retention of organic compounds. Prebiotic organic material was in all likelihood delivered the early Earth in a pristine state as a consequence of its sequestration within a protective water ice host.
    Keywords: Exobiology
    Type: ISOPOW 7 Symposium; Helsinki; Finland
    Format: application/pdf
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