Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Piani, Laurette; Nagashima, K.; Kawasaki, Noriyuki; Sakamoto, Naoya; Bajo, Ken‐ichi; Abe, Yoshinari; Adnot, Jérôme; Alexander, Conel M. O'd.; Amari, S.; Amelin, Yuri; Bizzarro, Martin; Bouvier, Audrey; Carlson, Richard W.; Chaussidon, M.; Choi, Byeon-Gak; Dauphas, N.; Davis, A. M.; Rocco, Tommaso Di; Fujiya, Wataru; Fukai, Ryota; Gautam, Ikshu; Haba, Makiko K.; Hibiya, Yuki; Hidaka, Hiroshi; Homma, Hisashi; Hoppe, P.; Huss, G. R.; Ichida, Kiyohiro; Iizuka, Tsuyoshi; Ireland, Trevor; Ishikawa, Akira; Itoh, Shoichi; Kita, N. T.; Kitajima, Kouki; Kleine, T.; Komatani, Shintaro; Krot, Alexander N.; Liu, Ming‐Chang; Masuda, Yuki; McKeegan, Kevin D.; Morita, Mariko; Motomura, Kazuko; Moynier, Frédéric; Nakai, Izumi; Nguyen, A. N.; Nittler, L. R.; Onose, Morihiko; Pack, Andreas; Park, Changkun; Qin, Liping; Russell, S. S.; Schönbächler, Maria; Tafla, Lauren; Tang, Haolan; Terada, Kentaro; Terada, Yasuko; Usui, Tomohiro; Wada, Sohei; Walker, Richard J.; Yamashita, Katsuyuki; Yin, Qing‐Zhu; Yokoyama, T.; Yoneda, Shigekazu; Young, Edward; Yui, Hiroharu; Zhang, Ai‐Cheng; Nakamura, Tomoki; Naraoka, Hiroshi; Okazaki, Ryuji; Sakamoto, Kanako; Yabuta, Hikaru; Abe, Masanao; Miyazaki, Akiko; Nakato, Aiko; Nishimura, Masahiro; Okada, T.; Yada, Toru; Yogata, Kasumi; Nakazawa, Shozo; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Tsuda, Yuichi; Watanabe, S.; Yoshikawa, Makoto; Tachibana, Shogo; Yurimoto, H.

doi:10.3847/2041-8213/acc393

Cited by 7 publications

(6 citation statements)

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“…It is a factor of 3 lower than the ratio for water in 67P/CG but fully compatible with the D/H ratio of hydrous minerals in CI chondrites (Piani et al. 2021 , 2023 ). However, as pointed out by Nittler et al.…”

Section: Isotopic Compositionssupporting

confidence: 75%

“…( 2023 ) inferred a D/H ratio of for water in Ryugu, which is slightly higher than that of Piani et al. ( 2023 ) and that of CI chondrites. These authors used an experimental approach that minimizes the effect of H contamination from organics interspersed with silicates.…”

Section: Isotopic Compositionsmentioning

confidence: 72%

“…( 2015 ); C-type asteroid Ryugu (D/H in water inferred from D/H in hydrous minerals): Piani et al. ( 2023 ), Nittler et al. ( 2023 ).…”

Section: Isotopic Compositionsmentioning

confidence: 99%

“…Piani et al. ( 2023 ) determined the D/H ratio of hydrous minerals in C-type asteroid Ryugu to , which can be considered a proxy of D/H in water at the time the hydrous minerals formed. It is a factor of 3 lower than the ratio for water in 67P/CG but fully compatible with the D/H ratio of hydrous minerals in CI chondrites (Piani et al.…”

Section: Isotopic Compositionsmentioning

confidence: 99%

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A Comparison of Presolar Isotopic Signatures in Laboratory-Studied Primitive Solar System Materials and Comet 67P/Churyumov-Gerasimenko: New Insights from Light Elements, Halogens, and Noble Gases

2023

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Comets are considered the most primitive planetary bodies in our Solar System. ESA’s Rosetta mission to Jupiter family comet 67P/Churyumov-Gerasimenko (67P/CG) has provided a wealth of isotope data which expanded the existing data sets on isotopic compositions of comets considerably. In a previous paper (Hoppe et al. in Space Sci. Rev. 214:106, 2018) we reviewed the results for comet 67P/CG from the first four years of data reduction after arrival of Rosetta at the comet in August 2014 and discussed them in the context of respective meteorite data. Since then important new isotope data of several elements, among them the biogenic elements H, C, N, and O, for comet 67P/CG, the Tagish Lake meteorite, and C-type asteroid Ryugu became available which provide new insights into the formation conditions of small planetary bodies in the Solar System’s earliest history. To complement the picture on comet 67P/CG and its context to other primitive Solar System materials, especially meteorites, that emerged from our previous paper, we review here the isotopic compositions of H, C, and N in various volatile molecules, of O in water and a suite of other molecules, of the halogens Cl and Br, and of the noble gas Kr in comet 67P/CG. Furthermore, we also review the H isotope data obtained in the refractory organics of the dust grains collected in the coma of 67P/CG. These data are compared with the respective meteoritic and Ryugu data and spectroscopic observations of other comets and extra-solar environments; Cl, Br, and Kr data are also evaluated in the context of a potential late supernova contribution, as suggested by the Si- and S-isotopic data of 67P/CG.

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Section: Isotopic Compositionssupporting

confidence: 75%

Section: Isotopic Compositionsmentioning

confidence: 72%

“…( 2015 ); C-type asteroid Ryugu (D/H in water inferred from D/H in hydrous minerals): Piani et al. ( 2023 ), Nittler et al. ( 2023 ).…”

Section: Isotopic Compositionsmentioning

confidence: 99%

Section: Isotopic Compositionsmentioning

confidence: 99%

See 2 more Smart Citations

A Comparison of Presolar Isotopic Signatures in Laboratory-Studied Primitive Solar System Materials and Comet 67P/Churyumov-Gerasimenko: New Insights from Light Elements, Halogens, and Noble Gases

2023

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“…The bulk elemental and isotopic abundances, and organic carbon contents (1.8∼4.0 wt.%) were in agreement with those of CI chondrites [19,[23][24][25][26]. The O-Cr isotopic compositions [19,23,27] indicated that Ryugu sampled the least thermally processed PSN material.…”

Section: The Nature Of Ryugu Particlessupporting

confidence: 69%

The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu

et al. 2023

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The Hayabusa2 mission returned primitive samples from the C-type asteroid Ryugu to Earth. The C-type asteroids hold clues to the origin of Earth’s water and the building blocks of life. The rubble pile structure of C-type asteroids is a crucial physical feature relating to their origin and evolution. A rubble pile asteroid is hypothesized to be bound primarily by self-gravity with a significant void space among irregularly shaped materials after catastrophic impacts between larger asteroids. However, the geological observations from Hayabusa2 and the analyses of the returned sample from Ryugu revealed that the high microporosity was common to various >10 m- to mm-sized materials of Ryugu, which suggests that the asteroid Ryugu is not just a loosely bound agglomeration of massive rocky debris from shattered asteroids. For a better understanding of the origin and evolution of the rubble pile asteroid, the current most accepted hypothesis should be verified by observations and laboratory analyses and improved upon based on this information. Here, the previous models are examined using Hayabusa2’s geological observations of the asteroid and the analytical data from the samples returned from Ryugu’s surface and subsurface material. Incorporating the new findings, a hypothesis for the evolution of the rubble pile asteroid Ryugu from a cometary nucleus through sublimation and subsequent dynamic resurfacing is proposed. The proposed hypothesis is applicable to other rubble-pile asteroids and would provide perspectives for near-Earth objects in general.

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