Chemical composition of carbonaceous asteroid Ryugu from synchrotron spectroscopy in the mid- to far-infrared of Hayabusa2-returned samples
Emmanuel Dartois
(1)
,
Yoko Kebukawa
(2)
,
Hikaru Yabuta
(3)
,
Jérémie Mathurin
(4)
,
Cécile Engrand
(5)
,
Jean Duprat
(6)
,
Laure Bejach
(5)
,
Alexandre Dazzi
(4)
,
Ariane Deniset-Besseau
(4)
,
Lydie Bonal
(7)
,
Eric Quirico
(7)
,
Christophe Sandt
(8)
,
Ferenc Borondics
(8)
,
Jens Barosch
(9)
,
George D Cody
(9)
,
Brad T de Gregorio
(10)
,
Minako Hashiguchi
(11)
,
David a L Kilcoyne
(12)
,
Mutsumi Komatsu
(13)
,
Zita Martins
(14)
,
Megumi Matsumoto
(15)
,
Gilles Montagnac
(16)
,
Smail Mostefaoui
(6)
,
Larry R Nittler
(9)
,
Takuji Ohigashi
(17)
,
Taiga Okumura
(18)
,
Laurent Remusat
(6)
,
Scott Sandford
(19)
,
Miho Shigenaka
(3)
,
Rhonda Stroud
(10)
,
Hiroki Suga
(20)
,
Yoshio Takahashi
(18, 21)
,
Yasuo Takeichi
(21)
,
Yusuke Tamenori
(20)
,
Maximilien Verdier-Paoletti
(6)
,
Shohei Yamashita
(20)
,
Tomoki Nakamura
(15)
,
Tomoyo Morita
(15)
,
Mizuha Kikuiri
(15)
,
Kana Amano
(15)
,
Eiichi Kagawa
(15)
,
Takaaki Noguchi
(22)
,
Hiroshi Naraoka
(23)
,
Ryuji Okazaki
(23)
,
Kanako Sakamoto
(24)
,
Hisayoshi Yurimoto
(25)
,
Masanao Abe
(24)
,
Kanami Kamide
(3)
,
Akiko Miyazaki
(24)
,
Aiko Nakato
(24)
,
Satoru Nakazawa
(24)
,
Masahiro Nishimura
(24)
,
Tatsuaki Okada
(24)
,
Takanao Saiki
(24)
,
Shogo Tachibana
(18, 24)
,
Satoshi Tanaka
(24)
,
Fuyuto Terui
(26)
,
Yuichi Tsuda
(24)
,
Tomohiro Usui
(24)
,
Sei-Ichiro Watanabe
(11)
,
Toru Yada
(24)
,
Kasumi Yogata
(24)
,
Makoto Yoshikawa
(24)
1
ISMO -
Institut des Sciences Moléculaires d'Orsay
2 Yokohama National University
3 Hiroshima University
4 ICP - Institut de Chimie Physique
5 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
6 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie
7 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
8 SSOLEIL - Synchrotron SOLEIL
9 Carnegie Institution of Washington
10 US Naval Research Laboratory
11 Nagoya University
12 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
13 Waseda University [Tokyo, Japan]
14 ULISBOA - Universidade de Lisboa = University of Lisbon = Université de Lisbonne
15 Tohoku University [Sendai]
16 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
17 UVSOR - Ultraviolet Synchrotron Orbital Radiation Facility
18 UTokyo - The University of Tokyo
19 ARC - NASA Ames Research Center
20 JASRI - Japan Synchrotron Radiation Research Institute [Hyogo]
21 High energy accelerator research organization - KEK
22 Kyoto University
23 Kyushu University
24 JAXA - Japan Aerospace Exploration Agency [Sagamihara]
25 Hokkaido University [Sapporo, Japan]
26 Kanagawa Institute of Technology
2 Yokohama National University
3 Hiroshima University
4 ICP - Institut de Chimie Physique
5 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
6 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie
7 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
8 SSOLEIL - Synchrotron SOLEIL
9 Carnegie Institution of Washington
10 US Naval Research Laboratory
11 Nagoya University
12 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
13 Waseda University [Tokyo, Japan]
14 ULISBOA - Universidade de Lisboa = University of Lisbon = Université de Lisbonne
15 Tohoku University [Sendai]
16 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
17 UVSOR - Ultraviolet Synchrotron Orbital Radiation Facility
18 UTokyo - The University of Tokyo
19 ARC - NASA Ames Research Center
20 JASRI - Japan Synchrotron Radiation Research Institute [Hyogo]
21 High energy accelerator research organization - KEK
22 Kyoto University
23 Kyushu University
24 JAXA - Japan Aerospace Exploration Agency [Sagamihara]
25 Hokkaido University [Sapporo, Japan]
26 Kanagawa Institute of Technology
Emmanuel Dartois
- Fonction : Auteur
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Yoko Kebukawa
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Cécile Engrand
- Fonction : Auteur
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- IdHAL : cecile-engrand
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- IdRef : 147692458
Jean Duprat
- Fonction : Auteur
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- IdHAL : jean-duprat
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- IdRef : 116736127
Laure Bejach
- Fonction : Auteur
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- ORCID : 0000-0002-0461-7089
Alexandre Dazzi
- Fonction : Auteur
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- IdHAL : alexandre-dazzi
Ariane Deniset-Besseau
- Fonction : Auteur
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- IdHAL : deniset-besseau-ariane
Lydie Bonal
- Fonction : Auteur
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- ORCID : 0000-0002-0655-4034
Eric Quirico
- Fonction : Auteur
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- IdRef : 118962604
Ferenc Borondics
- Fonction : Auteur
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Jens Barosch
- Fonction : Auteur
- PersonId : 1182473
- ORCID : 0000-0002-0651-7348
Brad T de Gregorio
- Fonction : Auteur
- PersonId : 1182477
- ORCID : 0000-0001-9096-3545
Minako Hashiguchi
- Fonction : Auteur
- PersonId : 1238491
- ORCID : 0000-0002-0302-2171
Mutsumi Komatsu
- Fonction : Auteur
- PersonId : 755309
- ORCID : 0000-0003-4659-8418
Gilles Montagnac
- Fonction : Auteur
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- IdHAL : gilles-montagnac
- ORCID : 0000-0001-9938-0282
- IdRef : 166235687
Laurent Remusat
- Fonction : Auteur
- PersonId : 174517
- IdHAL : laurent-remusat
- ORCID : 0009-0008-6423-6254
- IdRef : 096705655
Résumé
Context. The current period is conducive to exploring our Solar System's origins with recent and future space sample return missions, which provide invaluable information from known Solar System asteroids and comets The Hayabusa2 mission of the Japan Aerospace Exploration Agency (JAXA) recently brought back samples from the surface of the Ryugu carbonaceous asteroid. Aims. We aim to identify the different forms of chemical composition of organic matter and minerals that constitute these Solar System primitive objects, to shed light on the Solar System's origins. Methods. In this work, we recorded infrared (IR) hyper-spectral maps of whole-rock Ryugu asteroid samples at the highest achievable spatial resolution with a synchrotron in the mid-IR (MIR). Additional global far-IR (FIR) spectra of each sample were also acquired. Results. The hyper-spectral maps reveal the variability of the functional groups at small scales and the intimate association of phyllosilicates with the aliphatic components of the organic matter present in Ryugu. The relative proportion of column densities of the identified IR functional groups (aliphatics, hydroxyl + interlayer and/or physisorbed water, carbonyl, carbonates, and silicates) giving access to the composition of the Ryugu samples is estimated from these IR hyper-spectral maps. Phyllosilicate spectra reveal the presence of mixtures of serpentine and saponite. We do not detect anhydrous silicates in the samples analysed, at the scales probed. The carbonates are dominated by dolomite. Aliphatics organics are distributed over the whole samples at the micron scale probed with the synchrotron, and intimately mixed with the phyllosilicates. The aromatic C=C contribution could not be safely deconvolved from OH in most spectra, due to the ubiquitous presence of hydrated minerals. The peak intensity ratios of the organics methylene to methyl (CH 2 /CH 3) of the Ryugu samples vary between about 1.5 and 2.5, and are compared to the ratios in chondrites from types 1 to 3. Overall, the mineralogical and organic characteristics of the Ryugu samples show similarities with those of CI chondrites, although with a noticeably higher CH 2 /CH 3 in Ryugu than generally measured in C1 chondrites collected on Earth, and possibly a higher carbonate content.
Mots clés
minor planets asteroids: individual: Ryugu -meteorites meteors meteoroids -methods: laboratory: solid statetechniques: imaging spectroscopy -techniques: spectroscopic -protoplanetary disks
minor planets
asteroids: individual: Ryugu -meteorites
meteors
meteoroids -methods: laboratory: solid statetechniques: imaging spectroscopy -techniques: spectroscopic -protoplanetary disks
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