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DOI10.1073/pnas.2106197118
Quantitative evaluation of the feasibility of sampling the ice plumes at Enceladus for biomarkers of extraterrestrial life
New J.S.; Kazemi B.; Spathis V.; Price M.C.; Mathies R.A.; Butterworth A.L.
Date Issued2021
ISSN0027-8424
Volume118Issue:37
Other AbstractEnceladus, an icy moon of Saturn, is a compelling destination for a probe seeking biosignatures of extraterrestrial life because its subsurface ocean exhibits significant organic chemistry that is directly accessible by sampling cryovolcanic plumes. State-of-the-art organic chemical analysis instruments can perform valuable science measurements at Enceladus provided they receive sufficient plume material in a fly-by or orbiter plume transit. To explore the feasibility of plume sampling, we performed light gas gun experiments impacting micrometer-sized ice particles containing a fluorescent dye biosignature simulant into a variety of soft metal capture surfaces at velocities from 800 m · s-1 up to 3 km · s-1. Quantitative fluorescence microscopy of the capture surfaces demonstrates organic capture efficiencies of up to 80 to 90% for isolated impact craters and of at least 17% on average on indium and aluminum capture surfaces at velocities up to 2.2 km · s-1. Our results reveal the relationships between impact velocity, particle size, capture surface, and capture efficiency for a variety of possible plume transit scenarios. Combined with sensitive microfluidic chemical analysis instruments, we predict that our capture system can be used to detect organic molecules in Enceladus plume ice at the 1 nM level—a sensitivity thought to be meaningful and informative for probing habitability and biosignatures. © 2021 National Academy of Sciences. All rights reserved.
enkeywordsAstrobiology; Ice particle impacts; Ocean worlds; Planetary exploration; Space sciences instrumentation
Language英语
scopus keywordsaluminum; fluorescent dye; indium; Article; chemical analysis; controlled study; feasibility study; fluorescence microscopy; microfluidics; moon; particle size; plume; prediction; quantitative analysis; space; surface area; velocity
journalProceedings of the National Academy of Sciences of the United States of America
Document Type期刊论文
Identifierhttp://gcip.llas.ac.cn/handle/2XKMVOVA/238933
AffiliationSpace Sciences Laboratory, University of California, Berkeley, CA 94720, United States; School of Physical Sciences, University of Kent, Kent, CT2 7NH, United Kingdom; Department of Chemistry, University of California, Berkeley, CA 94720, United States
Recommended Citation
GB/T 7714
New J.S.,Kazemi B.,Spathis V.,et al. Quantitative evaluation of the feasibility of sampling the ice plumes at Enceladus for biomarkers of extraterrestrial life[J],2021,118(37).
APA New J.S.,Kazemi B.,Spathis V.,Price M.C.,Mathies R.A.,&Butterworth A.L..(2021).Quantitative evaluation of the feasibility of sampling the ice plumes at Enceladus for biomarkers of extraterrestrial life.Proceedings of the National Academy of Sciences of the United States of America,118(37).
MLA New J.S.,et al."Quantitative evaluation of the feasibility of sampling the ice plumes at Enceladus for biomarkers of extraterrestrial life".Proceedings of the National Academy of Sciences of the United States of America 118.37(2021).
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