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Presolar Stardust in Asteroid Ryugu

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Kleine,  Thorsten
Planetary Science Department, Max Planck Institute for Solar System Research, Max Planck Society;

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https://ui.adsabs.harvard.edu/abs/2022ApJ...935L...3B
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引用

Barosch, J., Nittler, L. R., Wang, J., Alexander, C. M. O., De Gregorio, B. T., Engrand, C., Kebukawa, Y., Nagashima, K., Stroud, R. M., Yabuta, H., Abe, Y., Aléon, J., Amari, S., Amelin, Y., Bajo, K.-i., Bejach, L., Bizzarro, M., Bonal, L., Bouvier, A., Carlson, R. W., Chaussidon, M., Choi, B.-G., Cody, G. D., Dartois, E., Dauphas, N., Davis, A. M., Dazzi, A., Deniset-Besseau, A., Di Rocco, T., Duprat, J., Fujiya, W., Fukai, R., Gautam, I., Haba, M. K., Hashiguchi, M., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G. R., Ichida, K., Iizuka, T., Ireland, T. R., Ishikawa, A., Ito, M., Itoh, S., Kamide, K., Kawasaki, N., David Kilcoyne, A. L., Kita, N. T., Kitajima, K., Kleine, T., Komatani, S., Komatsu, M., Krot, A. N., Liu, M.-C., Martins, Z., Masuda, Y., Mathurin, J., McKeegan, K. D., Montagnac, G., Morita, M., Mostefaoui, S., Motomura, K., Moynier, F., Nakai, I., Nguyen, A. N., Ohigashi, T., Okumura, T., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Quirico, E., Remusat, L., Russell, S. S., Sakamoto, N., Sandford, S. A., Schönbächler, M., Shigenaka, M., Suga, H., Tafla, L., Takahashi, Y., Takeichi, Y., Tamenori, Y., Tang, H., Terada, K., Terada, Y., Usui, T., Verdier-Paoletti, M., Wada, S., Wadhwa, M., Wakabayashi, D., Walker, R. J., Yamashita, K., Yamashita, S., Yin, Q.-Z., Yokoyama, T., Yoneda, S., Young, E. D., Yui, H., Zhang, A.-C., Abe, M., Miyazaki, A., Nakato, A., Nakazawa, S., Nishimura, M., Okada, T., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Watanabe, S.-i., Yada, T., Yogata, K., Yoshikawa, M., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Tachibana, S., & Yurimoto, H. (2022). Presolar Stardust in Asteroid Ryugu. The Astrophysical Journal, 935, L3. doi:10.3847/2041-8213/ac83bd.


引用: https://hdl.handle.net/21.11116/0000-000C-9537-E
要旨
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 ${4.8}_{-2.6}^{+4.7}$ ppm for O-anomalous grains, ${25}_{-5}^{+6}$ ppm for SiC grains, and ${11}_{-3}^{+5}$ 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 15 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: ${23}_{-6}^{+7}$ ppm SiC and ${9.0}_{-3.6}^{+5.4}$ 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.