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dc.contributor.authorLaurent, B.
dc.contributor.authorCousins, C. R.
dc.contributor.authorPereira, M. F. C.
dc.contributor.authorMartins, Z.
dc.identifier.citationLaurent , B , Cousins , C R , Pereira , M F C & Martins , Z 2019 , ' Effects of UV-organic interaction and Martian conditions on the survivability of organics ' , Icarus , vol. In press .
dc.identifier.otherPURE: 257572765
dc.identifier.otherPURE UUID: 44a16171-2afb-43a7-9552-e005b390ef47
dc.identifier.otherRIS: urn:023D7D04C56ADA53E103F202FD542D95
dc.identifier.otherScopus: 85060884252
dc.identifier.otherORCID: /0000-0002-3954-8079/work/60196596
dc.identifier.otherWOS: 000461846100003
dc.descriptionThis work was funded by the Leverhulme Trust (RPG-2015-071). Dr. C. Cousins also wishes to acknowledge funding from the Royal Society of Edinburgh. This work was financed by FEDER - Fundo Europeu de Desenvolvimento Regional funds through the COMPETE 2020 - Operacional Programme for Competitiveness and Internationalisation (POCI), and by Portuguese funds through FCT - Fundação para a Ciência e a Tecnologia in the framework of the project POCI-01-0145-FEDER-029932 (PTDC/FIS-AST/29932/2017).en
dc.description.abstractExogenous organic molecules are delivered to the surface of Mars annually, yet their fate is largely unknown. Likewise, the survivability of putative organic biomarkers directly implicates current Mars surface exploration ambitions. Among these, amino acids are valuable target molecules due to their abiogenic and biological origins. We present the fundamental, but not previously considered, factors that affect the fate of amino acids embedded in Mars mineral analogues when exposed to ionising radiation. Using existing experimental datasets, we show that the attenuation coefficient at 200 nm for amino acids is an effective parameter for quantifying organic survivability, especially when mineral shielding is limited or absent. Conversely, the dielectric constant of a material is a potential key parameter regarding mineral shielding, as it accounts for iron content, and the physical properties of the material (pore size, surface area or water content). Finally, we combine Martian climatic parameters (surface temperature and atmospheric opacity) to show that the relative UV environment varies significantly on Mars as a function of latitude, providing a reference point for future Mars simulation studies.
dc.rightsCopyright © 2019 Published by Elsevier Inc. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectAttenuation coefficienten
dc.subjectAmino acidsen
dc.subjectGE Environmental Sciencesen
dc.titleEffects of UV-organic interaction and Martian conditions on the survivability of organicsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.description.statusPeer revieweden

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