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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29857
Title: Photolysis of Cometary Organic Dust Analogs on the EXPOSE-R2 Mission at the International Space Station
Authors: BARATTA, Giuseppe 
Accolla, M.
Chaput, D.
Cottin, H.
PALUMBO, Maria Elisabetta 
Strazzulla, G.
Issue Date: 2019
Journal: ASTROBIOLOGY 
Number: 19
Issue: 8
First Page: 1018
Abstract: We describe the results obtained on a set of organic samples that have been part of the experiment "Photochemistry on the Space Station (PSS)" on the EXPOSE-R2 mission conducted on the EXPOSE-R facility situated outside the International Space Station (ISS). The organic samples were prepared in the Catania laboratory by 200 keV He<SUP>+</SUP> irradiation of N<SUB>2</SUB>:CH<SUB>4</SUB>:CO icy mixtures deposited at 17 K, on vacuum UV (VUV) transparent MgF<SUB>2</SUB> windows. This organic material contains different chemical groups, including triple CN bonds, that are thought to be of interest for astrobiology. It is widely accepted that materials similar to that produced in the laboratory by ion irradiation of frozen ices could be present in some astrophysical environments such as comets. Once expelled from comets, these materials are exposed to solar radiation during their interplanetary journey. In the young Solar System, some of these processed materials could have reached early Earth and contributed to its chemical and prebiotic evolution. The samples were exposed for 16 months to the unshielded solar UV photons. It was found that, if an interplanetary dust particle (IDP) containing organic material (50% vol) is large enough (>20-30 μm), relevant chemical groups, such as those containing the CN triple bond, can survive for many years (>10<SUP>4</SUP> years) in the interplanetary medium.
URI: http://hdl.handle.net/20.500.12386/29857
URL: https://www.liebertpub.com/doi/10.1089/ast.2018.1853
ISSN: 1531-1074
DOI: 10.1089/ast.2018.1853
Bibcode ADS: 2019AsBio..19.1018B
Fulltext: mixedopen
Appears in Collections:1.01 Articoli in rivista

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AstrobiologyPSS_Barattaetal.pdf[Administrators only]1.04 MBAdobe PDF
Barattaetal2019.pdfpreprint875.15 kBAdobe PDFView/Open
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