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19 April 2024 |
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Presolar stardust in asteroid Ryugu | | Jens Barosch
; Larry R. Nittler
; Jianhua Wang
; Conel M. O'D. Alexander
; Bradley T. De Gregorio
; Cécile Engrand
; Yoko Kebukawa
; Kazuhide Nagashima
; Rhonda M. Stroud
; Hikaru Yabuta
; Yoshinari Abe
; Jérôme Aléon
; Sachiko Amari
; Yuri Amelin
; Ken-ichi Bajo
; Laure Bejach
; Martin Bizzarro
; Lydie Bonal
; Audrey Bouvier
; Richard W. Carlson
; Marc Chaussidon
; Byeon-Gak Choi
; George D. Cody
; Emmanuel Dartois
; Nicolas Dauphas
; Andrew M. Davis
; Alexandre Dazzi
; Ariane Deniset-Besseau
; Tommaso Di Rocco
; Jean Duprat
; Wataru Fujiya
; Ryota Fukai
; Ikshu Gautam
; Makiko K. Haba
; Minako Hashiguchi
; Yuki Hibiya
; Hiroshi Hidaka
; Hisashi Homma
; Peter Hoppe
; Gary R. Huss
; Kiyohiro Ichida
; Tsuyoshi Iizuka
; Trevor R. Ireland
; Akira Ishikawa
; Motoo Ito
; Shoichi Itoh
; Kanami Kamide
; Noriyuki Kawasaki
; A. L. David Kilcoyne
; Noriko T. Kita
; Kouki Kitajima
; Thorsten Kleine
; Shintaro Komatani
; Mutsumi Komatsu
; Alexander N. Krot
; Ming-Chang Liu
; Zita Martins
; Yuki Masuda
; Jérémie Mathurin
; Kevin D. McKeegan
; Gilles Montagnac
; Mayu Morita
; Smail Mostefaoui
; Kazuko Motomura
; Frédéric Moynier
; Izumi Nakai
; Ann N. Nguyen
; Takuji Ohigashi
; Taiga Okumura
; Morihiko Onose
; Andreas Pack
; Changkun Park
; Laurette Piani
; Liping Qin
; Eric Quirico
; Laurent Remusat
; Sara S. Russell
; Naoya Sakamoto
; Scott A. Sandford
; Maria Schönbächler
; Miho Shigenaka
; Hiroki Suga
; Lauren Tafla
; Yoshio Takahashi
; Yasuo Takeichi
; Yusuke Tamenori
; Haolan Tang
; Kentaro Terada
; Yasuko Terada
; Tomohiro Usui
; Maximilien Verdier-Paoletti
; Sohei Wada
; Meenakshi Wadhwa
; Daisuke Wakabayashi
; Richard J. Walker
; Katsuyuki Yamashita
; Shohei Yamashita
; Qing-Zhu Yin
; Tetsuya Yokoyama
; Shigekazu Yoneda
; Edward D. Young
; Hiroharu Yui
; Ai-Cheng Zhang
; Masanao Abe
; Akiko Miyazaki
; Aiko Nakato
; Satoru Nakazawa
; Masahiro Nishimura
; Tatsuaki Okada
; Takanao Saiki
; Satoshi Tanaka
; Fuyuto Terui
; Yuichi Tsuda
; Sei-ichiro Watanabe
; Toru Yada
; Kasumi Yogata
; Makoto Yoshikawa
; Tomoki Nakamura
; Hiroshi Naraoka
; Takaaki Noguchi
; Ryuji Okazaki
; Kanako Sakamoto
; Shogo Tachibana
; Hisayoshi Yurimoto
; | | Date: |
17 Aug 2022 | | Abstract: | We have conducted a NanoSIMS-based search for presolar material in samples
recently returned from C-type asteroid Ryugu as part of JAXA’s Hayabusa2
mission. We report the detection of all major presolar grain types with O- and
C-anomalous isotopic compositions typically identified in carbonaceous
chondrite meteorites: 1 silicate, 1 oxide, 1 O-anomalous supernova grain of
ambiguous phase, 38 SiC, and 16 carbonaceous grains. At least two of the
carbonaceous grains are presolar graphites, whereas several grains with
moderate C isotopic anomalies are probably organics. The presolar silicate was
located in a clast with a less altered lithology than the typical extensively
aqueously altered Ryugu matrix. The matrix-normalized presolar grain abundances
in Ryugu are 4.8$^{+4.7}_{-2.6}$ ppm for O-anomalous grains, 25$^{+6}_{-5}$ ppm
for SiC grains and 11$^{+5}_{-3}$ ppm for carbonaceous grains. Ryugu is
isotopically and petrologically similar to carbonaceous Ivuna-type (CI)
chondrites. To compare the in situ presolar grain abundances of Ryugu with CI
chondrites, we also mapped Ivuna and Orgueil samples and found a total of SiC
grains and 6 carbonaceous grains. No O-anomalous grains were detected. The
matrix-normalized presolar grain abundances in the CI chondrites are similar to
those in Ryugu: 23 $^{+7}_{-6}$ ppm SiC and 9.0$^{+5.3}_{-4.6}$ ppm
carbonaceous grains. Thus, our results provide further evidence in support of
the Ryugu-CI connection. They also reveal intriguing hints of small-scale
heterogeneities in the Ryugu samples, such as locally distinct degrees of
alteration that allowed the preservation of delicate presolar material. | | Source: | arXiv, 2208.07976 | | Services: | Forum | Review | PDF | Favorites | |
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