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Scientific Value of Including an Atmospheric Sample as Part of Mars Sample Return (MSR).

Authors
  • Swindle, Timothy D1
  • Atreya, Sushil2
  • Busemann, Henner3
  • Cartwright, Julia A4
  • Mahaffy, Paul5
  • Marty, Bernard6
  • Pack, Andreas7
  • Schwenzer, Susanne P8
  • 1 University of Arizona, Lunar and Planetary Laboratory, Tucson, Arizona, USA.
  • 2 University of Michigan, Ann Arbor, Michigan, USA.
  • 3 ETH Zürich, Institute of Geochemistry and Petrology, Zürich, Switzerland. , (Switzerland)
  • 4 University of Alabama, Tuscaloosa, Alabama, USA.
  • 5 NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
  • 6 Université de Lorraine, CNRS, CRPG, Nancy, France. , (France)
  • 7 Universitat Göttingen, Göttingen, Germany. , (Germany)
  • 8 The Open University, Milton Keynes, UK.
Type
Published Article
Journal
Astrobiology
Publisher
Mary Ann Liebert
Publication Date
Jun 01, 2022
Volume
22
Issue
S1
Identifiers
DOI: 10.1089/AST.2021.0107
PMID: 34904893
Source
Medline
Language
English
License
Unknown

Abstract

The Perseverance rover is meant to collect samples of the martian surface for eventual return to Earth. The headspace gas present over the solid samples within the sample tubes will be of significant scientific interest for what it reveals about the interactions of the solid samples with the trapped atmosphere and for what it will reveal about the martian atmosphere itself. However, establishing the composition of the martian atmosphere will require other dedicated samples. The headspace gas as the sole atmospheric sample is problematic for many reasons. The quantity of gas present within the sample tube volume is insufficient for many investigations, and there will be exchange between solid samples, headspace gas, and tube walls. Importantly, the sample tube materials and preparation were not designed for optimal Mars atmospheric gas collection and storage as they were not sent to Mars in a degassed evacuated state and have been exposed to both Earth's and Mars' atmospheres. Additionally, there is a risk of unconstrained seal leakage in transit back to Earth, which would allow fractionation of the sample (leak-out) and contamination (leak-in). The science return can be improved significantly (and, in some cases, dramatically) by adding one or more of several strategies listed here in increasing order of effectiveness and difficulty of implementation: (1) Having Perseverance collect a gas sample in an empty sample tube, (2) Collecting gas in a newly-designed, valved, sample-tube-sized vessel that is flown on either the Sample Fetch Rover (SFR) or the Sample Retrieval Lander (SRL), (3) Adding a larger (50-100 cc) dedicated gas sampling volume to the Orbiting Sample container (OS), (4) Adding a larger (50-100 cc) dedicated gas sampling volume to the OS that can be filled with compressed martian atmosphere.

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