Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu

Zachary A. Torrano; Michelle K. Jordan; Timothy D. Mock; Richard W. Carlson; Ikshu Gautam; Makiko K. Haba; Tetsuya Yokoyama; Yoshinari Abe; Jérôme Aléon; Conel Alexander; Sachiko Amari; Yuri Amelin; Ken ichi Bajo; Martin Bizzarro; Audrey Bouvier; Marc Chaussidon; Byeon Gak Choi; Nicolas Dauphas; Andrew M. Davis; Tommaso Di Rocco; Wataru Fujiya; Ryota Fukai; Yuki Hibiya; Hiroshi Hidaka; Hisashi Homma; Peter Hoppe; Gary R. Huss; Kiyohiro Ichida; Tsuyoshi Iizuka; Trevor Ireland; Akira Ishikawa; Shoichi Itoh; Noriyuki Kawasaki; Noriko T. Kita; Koki Kitajima; Thorsten Kleine; Shintaro Komatani; Alexander N. Krot; Ming Chang Liu; Yuki Masuda; Kevin D. McKeegan; Mayu Morita; Kazuko Motomura; Frédéric Moynier; Izumi Nakai; Kazuhide Nagashima; Ann Nguyen; Larry Nittler; Morihiko Onose; Andreas Pack; Changkun Park; Laurette Piani; Liping Qin; Sara Russell; Naoya Sakamoto; Maria Schönbächler; Lauren Tafla; Haolan Tang; Kentaro Terada; Yasuko Terada; Tomohiro Usui; Sohei Wada; Meenakshi Wadhwa; Richard J. Walker; Katsuyuki Yamashita; Qing Zhu Yin; Shigekazu Yoneda; Edward D. Young; Hiroharu Yui; Ai Cheng Zhang; Tomoki Nakamura; Hiroshi Naraoka; Takaaki Noguchi; Ryuji Okazaki; Kanako Sakamoto; Hikaru Yabuta; Masanao Abe; Akiko Miyazaki; Aiko Nakato; Masahiro Nishimura; Tatsuaki Okada; Toru Yada; Kasumi Yogata; Satoru Nakazawa; Takanao Saiki; Satoshi Tanaka; Fuyuto Terui; Yuichi Tsuda; Sei ichiro Watanabe; Makoto Yoshikawa; Shogo Tachibana; Hisayoshi Yurimoto

doi:10.1111/maps.14109

Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu

Zachary A. Torrano, Michelle K. Jordan, Timothy D. Mock, Richard W. Carlson, Ikshu Gautam, Makiko K. Haba, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel Alexander, Sachiko Amari, Yuri Amelin, Ken ichi Bajo, Martin Bizzarro, Audrey Bouvier, Marc Chaussidon, Byeon Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di RoccoWataru Fujiya, Ryota Fukai, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Koki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Izumi Nakai, Kazuhide Nagashima, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

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Abstract

We report Nd and Sm isotopic compositions of four samples of Ryugu returned by the Hayabusa2 mission, including “A” (first touchdown) and “C” (second touchdown) samples, and several carbonaceous chondrites to evaluate potential genetic relationships between Ryugu and known chondrite groups and track the cosmic ray exposure history of Ryugu. We resolved Nd and Sm isotopic anomalies in small (<20 ng Nd and Sm) sample sizes via thermal ionization mass spectrometer using 10¹³ Ω amplifiers. Ryugu samples exhibit resolvable negative μ¹⁴²Nd values consistent with carbonaceous chondrite values, suggesting that Ryugu is related to the parent bodies of carbonaceous chondrites. Ryugu's negative μ¹⁴⁹Sm values are the result of exposure to galactic cosmic rays, as demonstrated by the correlation between ¹⁵⁰Sm/¹⁵²Sm and ¹⁴⁹Sm/¹⁵²Sm ratios that fall along the expected neutron capture correlation line. The neutron fluence calculated in the “A” samples (2.75 ± 1.94 × 10¹⁵ n cm⁻²) is slightly higher compared to the “C” samples (0.95 ± 2.04 × 10¹⁵ n cm⁻²), though overlapping within measurement uncertainty. The Sm results for Ryugu, at this level of precision, thus are consistent with a well-mixed surface layer at least to the depths from which the “A” and “C” samples derive.

Original language	English (US)
Journal	Meteoritics and Planetary Science
DOIs	https://doi.org/10.1111/maps.14109
State	Accepted/In press - 2023

ASJC Scopus subject areas

Geophysics
Space and Planetary Science

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Torrano, Z. A., Jordan, M. K., Mock, T. D., Carlson, R. W., Gautam, I., Haba, M. K., Yokoyama, T., Abe, Y., Aléon, J., Alexander, C., Amari, S., Amelin, Y., Bajo, K. I., Bizzarro, M., Bouvier, A., Chaussidon, M., Choi, B. G., Dauphas, N., Davis, A. M., ... Yurimoto, H. (Accepted/In press). Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu. Meteoritics and Planetary Science. https://doi.org/10.1111/maps.14109

Torrano, ZA, Jordan, MK, Mock, TD, Carlson, RW, Gautam, I, Haba, MK, Yokoyama, T, Abe, Y, Aléon, J, Alexander, C, Amari, S, Amelin, Y, Bajo, KI, Bizzarro, M, Bouvier, A, Chaussidon, M, Choi, BG, Dauphas, N, Davis, AM, Di Rocco, T, Fujiya, W, Fukai, R, Hibiya, Y, Hidaka, H, Homma, H, Hoppe, P, Huss, GR, Ichida, K, Iizuka, T, Ireland, T, Ishikawa, A, Itoh, S, Kawasaki, N, Kita, NT, Kitajima, K, Kleine, T, Komatani, S, Krot, AN, Liu, MC, Masuda, Y, McKeegan, KD, Morita, M, Motomura, K, Moynier, F, Nakai, I, Nagashima, K, Nguyen, A, Nittler, L, Onose, M, Pack, A, Park, C, Piani, L, Qin, L, Russell, S, Sakamoto, N, Schönbächler, M, Tafla, L, Tang, H, Terada, K, Terada, Y, Usui, T, Wada, S, Wadhwa, M, Walker, RJ, Yamashita, K, Yin, QZ, Yoneda, S, Young, ED, Yui, H, Zhang, AC, Nakamura, T, Naraoka, H, Noguchi, T, Okazaki, R, Sakamoto, K, Yabuta, H, Abe, M, Miyazaki, A, Nakato, A, Nishimura, M, Okada, T, Yada, T, Yogata, K, Nakazawa, S, Saiki, T, Tanaka, S, Terui, F, Tsuda, Y, Watanabe, SI, Yoshikawa, M, Tachibana, S & Yurimoto, H 2023, 'Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu', Meteoritics and Planetary Science. https://doi.org/10.1111/maps.14109

@article{95222a632e464186b0f454c1507fac89,

title = "Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu",

abstract = "We report Nd and Sm isotopic compositions of four samples of Ryugu returned by the Hayabusa2 mission, including “A” (first touchdown) and “C” (second touchdown) samples, and several carbonaceous chondrites to evaluate potential genetic relationships between Ryugu and known chondrite groups and track the cosmic ray exposure history of Ryugu. We resolved Nd and Sm isotopic anomalies in small (<20 ng Nd and Sm) sample sizes via thermal ionization mass spectrometer using 1013 Ω amplifiers. Ryugu samples exhibit resolvable negative μ142Nd values consistent with carbonaceous chondrite values, suggesting that Ryugu is related to the parent bodies of carbonaceous chondrites. Ryugu's negative μ149Sm values are the result of exposure to galactic cosmic rays, as demonstrated by the correlation between 150Sm/152Sm and 149Sm/152Sm ratios that fall along the expected neutron capture correlation line. The neutron fluence calculated in the “A” samples (2.75 ± 1.94 × 1015 n cm−2) is slightly higher compared to the “C” samples (0.95 ± 2.04 × 1015 n cm−2), though overlapping within measurement uncertainty. The Sm results for Ryugu, at this level of precision, thus are consistent with a well-mixed surface layer at least to the depths from which the “A” and “C” samples derive.",

author = "Torrano, {Zachary A.} and Jordan, {Michelle K.} and Mock, {Timothy D.} and Carlson, {Richard W.} and Ikshu Gautam and Haba, {Makiko K.} and Tetsuya Yokoyama and Yoshinari Abe and J{\'e}r{\^o}me Al{\'e}on and Conel Alexander and Sachiko Amari and Yuri Amelin and Bajo, {Ken ichi} and Martin Bizzarro and Audrey Bouvier and Marc Chaussidon and Choi, {Byeon Gak} and Nicolas Dauphas and Davis, {Andrew M.} and {Di Rocco}, Tommaso and Wataru Fujiya and Ryota Fukai and Yuki Hibiya and Hiroshi Hidaka and Hisashi Homma and Peter Hoppe and Huss, {Gary R.} and Kiyohiro Ichida and Tsuyoshi Iizuka and Trevor Ireland and Akira Ishikawa and Shoichi Itoh and Noriyuki Kawasaki and Kita, {Noriko T.} and Koki Kitajima and Thorsten Kleine and Shintaro Komatani and Krot, {Alexander N.} and Liu, {Ming Chang} and Yuki Masuda and McKeegan, {Kevin D.} and Mayu Morita and Kazuko Motomura and Fr{\'e}d{\'e}ric Moynier and Izumi Nakai and Kazuhide Nagashima and Ann Nguyen and Larry Nittler and Morihiko Onose and Andreas Pack and Changkun Park and Laurette Piani and Liping Qin and Sara Russell and Naoya Sakamoto and Maria Sch{\"o}nb{\"a}chler and Lauren Tafla and Haolan Tang and Kentaro Terada and Yasuko Terada and Tomohiro Usui and Sohei Wada and Meenakshi Wadhwa and Walker, {Richard J.} and Katsuyuki Yamashita and Yin, {Qing Zhu} and Shigekazu Yoneda and Young, {Edward D.} and Hiroharu Yui and Zhang, {Ai Cheng} and Tomoki Nakamura and Hiroshi Naraoka and Takaaki Noguchi and Ryuji Okazaki and Kanako Sakamoto and Hikaru Yabuta and Masanao Abe and Akiko Miyazaki and Aiko Nakato and Masahiro Nishimura and Tatsuaki Okada and Toru Yada and Kasumi Yogata and Satoru Nakazawa and Takanao Saiki and Satoshi Tanaka and Fuyuto Terui and Yuichi Tsuda and Watanabe, {Sei ichiro} and Makoto Yoshikawa and Shogo Tachibana and Hisayoshi Yurimoto",

note = "Publisher Copyright: {\textcopyright} 2023 The Meteoritical Society.",

year = "2023",

doi = "10.1111/maps.14109",

language = "English (US)",

journal = "Meteoritics and Planetary Science",

issn = "1086-9379",

publisher = "The University of Arkansas Press",

}

TY - JOUR

T1 - Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu

AU - Torrano, Zachary A.

AU - Jordan, Michelle K.

AU - Mock, Timothy D.

AU - Carlson, Richard W.

AU - Gautam, Ikshu

AU - Haba, Makiko K.

AU - Yokoyama, Tetsuya

AU - Abe, Yoshinari

AU - Aléon, Jérôme

AU - Alexander, Conel

AU - Amari, Sachiko

AU - Amelin, Yuri

AU - Bajo, Ken ichi

AU - Bizzarro, Martin

AU - Bouvier, Audrey

AU - Chaussidon, Marc

AU - Choi, Byeon Gak

AU - Dauphas, Nicolas

AU - Davis, Andrew M.

AU - Di Rocco, Tommaso

AU - Fujiya, Wataru

AU - Fukai, Ryota

AU - Hibiya, Yuki

AU - Hidaka, Hiroshi

AU - Homma, Hisashi

AU - Hoppe, Peter

AU - Huss, Gary R.

AU - Ichida, Kiyohiro

AU - Iizuka, Tsuyoshi

AU - Ireland, Trevor

AU - Ishikawa, Akira

AU - Itoh, Shoichi

AU - Kawasaki, Noriyuki

AU - Kita, Noriko T.

AU - Kitajima, Koki

AU - Kleine, Thorsten

AU - Komatani, Shintaro

AU - Krot, Alexander N.

AU - Liu, Ming Chang

AU - Masuda, Yuki

AU - McKeegan, Kevin D.

AU - Morita, Mayu

AU - Motomura, Kazuko

AU - Moynier, Frédéric

AU - Nakai, Izumi

AU - Nagashima, Kazuhide

AU - Nguyen, Ann

AU - Nittler, Larry

AU - Onose, Morihiko

AU - Pack, Andreas

AU - Park, Changkun

AU - Piani, Laurette

AU - Qin, Liping

AU - Russell, Sara

AU - Sakamoto, Naoya

AU - Schönbächler, Maria

AU - Tafla, Lauren

AU - Tang, Haolan

AU - Terada, Kentaro

AU - Terada, Yasuko

AU - Usui, Tomohiro

AU - Wada, Sohei

AU - Wadhwa, Meenakshi

AU - Walker, Richard J.

AU - Yamashita, Katsuyuki

AU - Yin, Qing Zhu

AU - Yoneda, Shigekazu

AU - Young, Edward D.

AU - Yui, Hiroharu

AU - Zhang, Ai Cheng

AU - Nakamura, Tomoki

AU - Naraoka, Hiroshi

AU - Noguchi, Takaaki

AU - Okazaki, Ryuji

AU - Sakamoto, Kanako

AU - Yabuta, Hikaru

AU - Abe, Masanao

AU - Miyazaki, Akiko

AU - Nakato, Aiko

AU - Nishimura, Masahiro

AU - Okada, Tatsuaki

AU - Yada, Toru

AU - Yogata, Kasumi

AU - Nakazawa, Satoru

AU - Saiki, Takanao

AU - Tanaka, Satoshi

AU - Terui, Fuyuto

AU - Tsuda, Yuichi

AU - Watanabe, Sei ichiro

AU - Yoshikawa, Makoto

AU - Tachibana, Shogo

AU - Yurimoto, Hisayoshi

PY - 2023

Y1 - 2023

N2 - We report Nd and Sm isotopic compositions of four samples of Ryugu returned by the Hayabusa2 mission, including “A” (first touchdown) and “C” (second touchdown) samples, and several carbonaceous chondrites to evaluate potential genetic relationships between Ryugu and known chondrite groups and track the cosmic ray exposure history of Ryugu. We resolved Nd and Sm isotopic anomalies in small (<20 ng Nd and Sm) sample sizes via thermal ionization mass spectrometer using 1013 Ω amplifiers. Ryugu samples exhibit resolvable negative μ142Nd values consistent with carbonaceous chondrite values, suggesting that Ryugu is related to the parent bodies of carbonaceous chondrites. Ryugu's negative μ149Sm values are the result of exposure to galactic cosmic rays, as demonstrated by the correlation between 150Sm/152Sm and 149Sm/152Sm ratios that fall along the expected neutron capture correlation line. The neutron fluence calculated in the “A” samples (2.75 ± 1.94 × 1015 n cm−2) is slightly higher compared to the “C” samples (0.95 ± 2.04 × 1015 n cm−2), though overlapping within measurement uncertainty. The Sm results for Ryugu, at this level of precision, thus are consistent with a well-mixed surface layer at least to the depths from which the “A” and “C” samples derive.

AB - We report Nd and Sm isotopic compositions of four samples of Ryugu returned by the Hayabusa2 mission, including “A” (first touchdown) and “C” (second touchdown) samples, and several carbonaceous chondrites to evaluate potential genetic relationships between Ryugu and known chondrite groups and track the cosmic ray exposure history of Ryugu. We resolved Nd and Sm isotopic anomalies in small (<20 ng Nd and Sm) sample sizes via thermal ionization mass spectrometer using 1013 Ω amplifiers. Ryugu samples exhibit resolvable negative μ142Nd values consistent with carbonaceous chondrite values, suggesting that Ryugu is related to the parent bodies of carbonaceous chondrites. Ryugu's negative μ149Sm values are the result of exposure to galactic cosmic rays, as demonstrated by the correlation between 150Sm/152Sm and 149Sm/152Sm ratios that fall along the expected neutron capture correlation line. The neutron fluence calculated in the “A” samples (2.75 ± 1.94 × 1015 n cm−2) is slightly higher compared to the “C” samples (0.95 ± 2.04 × 1015 n cm−2), though overlapping within measurement uncertainty. The Sm results for Ryugu, at this level of precision, thus are consistent with a well-mixed surface layer at least to the depths from which the “A” and “C” samples derive.

UR - http://www.scopus.com/inward/record.url?scp=85178938374&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85178938374&partnerID=8YFLogxK

U2 - 10.1111/maps.14109

DO - 10.1111/maps.14109

M3 - Article

AN - SCOPUS:85178938374

SN - 1086-9379

JO - Meteoritics and Planetary Science

JF - Meteoritics and Planetary Science

ER -

Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu

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