Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System

Hopp, Timo; Dauphas, N.; Abe, Yoshinari; Adnot, Jérôme; Alexander, Conel M. O'd.; Amari, S.; Amelin, Yuri; Bajo, Ken‐ichi; Bizzarro, Martin; Bouvier, Audrey; Carlson, Richard W.; Chaussidon, M.; Choi, Byeon-Gak; 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; Ito, Motoo; Itoh, Shoichi; Kawasaki, Noriyuki; 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; Nagashima, K.; Vokrouhlický, D.; Nguyen, A. N.; Nittler, L. R.; Onose, Morihiko; Pack, Andreas; Park, Changkun; Piani, Laurette; Qin, Liping; Russell, S. S.; Sakamoto, Naoya; Schönbächler, Maria; Tafla, Lauren; Tang, Haolan; Terada, Kentaro; Terada, Yasuko; Yabuta, Hikaru; 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; Noguchi, Takaaki; Okazaki, Ryuji; Sakamoto, Kanako; Yabuta, Hikaru; Okazaki, Ryuji; 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:10.1126/sciadv.add8141

Cited by 42 publications

(15 citation statements)

References 82 publications

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“…Figure 8 presents a comparison between Sycorax and Caliban and the sample of meteorite Alais and illustrates a plausible match in their visible colors. Recent study of the returned sample from asteroid Ryugu motivated a hypothesized link between CI-like material and material formed in the ice giant region (Hopp et al 2022). In this light, and with the evidence we present for a 0.7 μm feature on Sycorax, we conclude that the spectral similarities between Alais and Sycorax/Caliban strengthen the comparison between the irregular satellites of Uranus and hydrated carbonaceous chondrites.…”

Section: Uranian Irregulars and Neptune Trojans: Evidence For Hydrate...supporting

confidence: 81%

Spectroscopic Links among Giant Planet Irregular Satellites and Trojans

Sharkey,

Reddy,

Kuhn

et al. 2023

Planet. Sci. J.

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We collect near-infrared spectra (∼0.75–2.55 μm) of four Jovian irregular satellites and visible spectra (∼0.32–1.00 μm) of two Jovian irregular satellites, two Uranian irregular satellites, and four Neptune Trojans. We find close similarities between the observed Jovian irregular satellites and previously characterized Jovian Trojans. However, irregular satellites’ unique collisional histories complicate comparisons to other groups. Laboratory study of CM and CI chondrites shows that grain size and regolith packing conditions strongly affect spectra of dark, carbonaceous materials. We hypothesize that different activity histories of these objects, which may have originally contained volatile ices that subsequently sublimated, could cause differences in regolith grain size or packing properties and therefore drive spectral variation. The Uranian satellites Sycorax and Caliban appear similar to TNOs. However, we detect a feature near 0.7 μm on Sycorax, suggesting the presence of hydrated materials. While the sample of Neptune Trojans have more neutral spectra than the Uranian satellites we observe, they remain consistent with the broad color distribution of the Kuiper Belt. We detect a possible feature near 0.65–0.70 μm on Neptune Trojan 2006 RJ103, suggesting that hydrated material may also be present in this population. Characterizing hydrated materials in the outer solar system may provide critical context regarding the origins of hydrated CI and CM chondrite meteorites. We discuss how the hydration state(s) of the irregular satellites constrains the thermal histories of the interiors of their parent bodies, which may have formed among the primordial Kuiper Belt.

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Section: Uranian Irregulars and Neptune Trojans: Evidence For Hydrate...supporting

confidence: 81%

Spectroscopic Links among Giant Planet Irregular Satellites and Trojans

Sharkey,

Reddy,

Kuhn

et al. 2023

Planet. Sci. J.

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“…The accretion regions of the Ryugu and CI chondrites parent body are inferred to be beyond 3 to 4 au ( 2 ) and possibly as far as ~15 au from the Sun ( 39 ). Whole rock Fe isotopic compositions of Ryugu and CI chondrites also imply that they are accreted in the outer Solar System ( 40 ). In this context, the 16 O-rich primary minerals were transported outward from the innermost region to the outerskirts of the disk system.…”

Section: Discussionmentioning

confidence: 99%

Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2

et al. 2022

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The extraterrestrial materials returned from asteroid (162173) Ryugu consist predominantly of low-temperature aqueously formed secondary minerals and are chemically and mineralogically similar to CI (Ivuna-type) carbonaceous chondrites. Here, we show that high-temperature anhydrous primary minerals in Ryugu and CI chondrites exhibit a bimodal distribution of oxygen isotopic compositions: 16 O-rich (associated with refractory inclusions) and 16 O-poor (associated with chondrules). Both the 16 O-rich and 16 O-poor minerals probably formed in the inner solar protoplanetary disk and were subsequently transported outward. The abundance ratios of the 16 O-rich to 16 O-poor minerals in Ryugu and CI chondrites are higher than in other carbonaceous chondrite groups but are similar to that of comet 81P/Wild2, suggesting that Ryugu and CI chondrites accreted in the outer Solar System closer to the accretion region of comets.

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“…A surprising characteristic of the hydrogen isotopic composition of Ryugu/CI water is its moderate D-enrichment (Figure 3). Indeed, CI chondrites likely accreted in the outer solar system (Gounelle et al 2006;Desch et al 2018), where water ices are expected to have large D-excesses (Jacquet & Robert 2013;Kavelaars et al 2011;Hopp et al 2022) and as illustrated by the generally high D/H ratios measured in comets (Müller et al 2022). Although secondary parent body processes could have modified the hydrogen isotopic compositions of chondritic waters (Alexander et al 2010;Sutton et al 2017), through aqueous oxidation of Fe-Ni metal beads followed by H 2 loss and Rayleigh-like isotopic fractionation, this process is not expected to produce large isotopic changes in water-rich meteorites such as CIs (Alexander et al 2010).…”

Section: Implications For the Origin And Distribution Of Water In The...mentioning

confidence: 99%

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Piani

Nagashima

Kawasaki

et al. 2023

ApJL

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Rock fragments of the Cb-type asteroid Ryugu returned to Earth by the JAXA Hayabusa2 mission share mineralogical, chemical, and isotopic properties with the Ivuna-type (CI) carbonaceous chondrites. Similar to CI chondrites, these fragments underwent extensive aqueous alteration and consist predominantly of hydrous minerals likely formed in the presence of liquid water on the Ryugu parent asteroid. Here we present an in situ analytical survey performed by secondary ion mass spectrometry from which we have estimated the D/H ratio of Ryugu’s hydrous minerals, D/HRyugu, to be [165 ± 19] × 10−6, which corresponds to δDRyugu = +59 ± 121‰ (2σ). The hydrous mineral D/HRyugu’s values for the two sampling sites on Ryugu are similar; they are also similar to the estimated D/H ratio of hydrous minerals in the CI chondrites Orgueil and Alais. This result reinforces a link between Ryugu and CI chondrites and an inference that Ryugu’s samples, which avoided terrestrial contamination, are our best proxy to estimate the composition of water at the origin of hydrous minerals in CI-like material. Based on this data and recent literature studies, the contribution of CI chondrites to the hydrogen of Earth’s surficial reservoirs is evaluated to be ∼3%. We conclude that the water responsible for the alteration of Ryugu’s rocks was derived from water ice precursors inherited from the interstellar medium; the ice partially re-equilibrated its hydrogen with the nebular H2 before being accreted on the Ryugu’s parent asteroid.

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Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System

Cited by 42 publications

References 82 publications

Spectroscopic Links among Giant Planet Irregular Satellites and Trojans

Spectroscopic Links among Giant Planet Irregular Satellites and Trojans

Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

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