TY - JOUR
T1 - Chemical assessment of the explosive chamber in the projector system of Hayabusa2 for asteroid sampling
AU - Hayabusa2 project team
AU - Takano, Yoshinori
AU - Yamada, Keita
AU - Okamoto, Chisato
AU - Sawada, Hirotaka
AU - Okazaki, Ryuji
AU - Sakamoto, Kanako
AU - Kebukawa, Yoko
AU - Kiryu, Kento
AU - Shibuya, Takazo
AU - Igisu, Motoko
AU - Yano, Hajime
AU - Tachibana, Shogo
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas (Research Project on Evolution of Molecules in Space; YT, No. 25108006) by project leader Prof. Akira Kouchi (Hokkaido Univ.) from the Japan Society for the Promotion of Science (JSPS) and in part by a JSPS grant (No. 19H00712, ST; No. 16H04083, YT; No. JP17H06458, YK&TS). Acknowledgements
Funding Information:
We express our sincere thanks to the associate editor Dr. Takaaki Noguchi (Kyushu Univ.) and two anonymous reviewers for the valuable comments, which helped to improve the earlier version of the manuscript. The experiments with explosives were permitted by the Institute of Space and Astronautical Science (ISAS). We thank Akira Fujiwara, Sunao Hasegawa and Masanao Abe of ISAS/JAXA, Kazuyoshi Takayama and Koichi Okano of Tohoku University for contributing the original design and development of the Hayabusa projector sub-system. The Hayabusa2 project team is acknowledged for supervising assessment experiments of the Hayabusa2 projector. We appreciate the Space Plasma Laboratories at ISAS, JAXA, for their support in the development of the Hayabusa2 sampler as a collaborative research program. We also thank Renesas Semiconductor Manufacturing Co. Ltd. and Toshiba Nanoanalysis Corporation for their help with the assessments. Preliminary reports based on this paper were presented at Hayabusa 2015 (3rd symposium of Solar System Materials) and the Solar System Symposium in Sapporo, 2020.
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - We report a chemical assessment of the explosive chamber in the projector system used during the sampling operation of the Hayabusa2 project at the surface of the C-type asteroid Ryugu. Although the explosion process was designed as a closed system, volatile combustion gases and semivolatile organics were produced together with quenched carbonaceous product. The chemical compositions of the gases, organics, and inorganics were investigated in the screening analysis. A solid-phase microextraction technique and thermal desorption coupled with gas chromatography/mass spectrometry analysis revealed that aliphatic (< C20n-alkanes) and aromatic (< pyrene) hydrocarbons were produced in the closed chamber system. The aromatic ring compositions of the latter showed a semilogarithmic decrease: one ring > two rings > three rings > four rings, resulting in abiogenic molecular patterns. The most intense inorganic fingerprints were due to potassium (K+) and chloride (Cl–) ions derived from the initial KTB explosive and RK ignition charge. We discuss quality control and quality assurance issues applicable to future sample processes during the Hayabusa2 project.[Figure not available: see fulltext.].
AB - We report a chemical assessment of the explosive chamber in the projector system used during the sampling operation of the Hayabusa2 project at the surface of the C-type asteroid Ryugu. Although the explosion process was designed as a closed system, volatile combustion gases and semivolatile organics were produced together with quenched carbonaceous product. The chemical compositions of the gases, organics, and inorganics were investigated in the screening analysis. A solid-phase microextraction technique and thermal desorption coupled with gas chromatography/mass spectrometry analysis revealed that aliphatic (< C20n-alkanes) and aromatic (< pyrene) hydrocarbons were produced in the closed chamber system. The aromatic ring compositions of the latter showed a semilogarithmic decrease: one ring > two rings > three rings > four rings, resulting in abiogenic molecular patterns. The most intense inorganic fingerprints were due to potassium (K+) and chloride (Cl–) ions derived from the initial KTB explosive and RK ignition charge. We discuss quality control and quality assurance issues applicable to future sample processes during the Hayabusa2 project.[Figure not available: see fulltext.].
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U2 - 10.1186/s40623-020-01217-y
DO - 10.1186/s40623-020-01217-y
M3 - Article
AN - SCOPUS:85087749297
VL - 72
JO - Earth, Planets and Space
JF - Earth, Planets and Space
SN - 1343-8832
IS - 1
M1 - 97
ER -