Yokoyama Laboratory investigates origin and evolution of the early solar system materials by isotopic and elemental analysis of terrestrial and extraterrestrial mateterials.

NEWS
11/17/2023 New Ryugu paper has been published.

11/09/2023 New Ryugu paper has been published.

07/14/2023 Two Ryugu paper have been published.


RECENT TOPICS

Hu, Y., Moynier, F., Dai, W., Paquet, M., Yokoyama, T.., ... Gautam, I., ... Haba, M.K., ... Masuda, Y., ..., et al.

Pervasive aqueous alteration in the early Solar System revealed by potassium isotopic variations in Ryugu samples and carbonaceous chondrites.
Icarus, 489, 115884, 2023.

Bizzarro, M., Schiller, M., Yokoyama, T.., ... Gautam, I., ... Haba, M.K., ... Masuda, Y., ..., et al.

The magnesium isotope composition of samples returned from asteroid Ryugu.
Astophys. J. Lett., 958, L25 (9pp), 2023.

Yokoyama, T.., Wadhwa, M., Iizuka, T., ... Gautam, I., ... Masuda, Y., Haba, M.K., ..., et al.

Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample.
Science Advances, 9, eadi7048, 2023.
Tokyo Tech News: Exploring the Origin of Nucleosynthetic Isotope Variations in Ryugu Samples

Kajitani, I., Koike, M., Nakada, R., Tanabe, G., Usui, T., Matsu'ura, F., Fukushi, K., Yokoyama, T.

The oxygen isotopic composition of samples returned from asteroid Ryugu with implications for the nature of the parent planetesimal.
Earth and planetary Science Letters, 620, 118345, 2023.

Tang, H., Young, E.D., ... Gautam, I., ... Haba, M.K., ... Masuda, Y., ... Yokoyama, T., et al.

Hydrogen isotopic composition of hydrous minerals in asteroid Ryugu.
Planetary Science Journal, 4, 144, 2023.

Yoshimura, T., ..., Yokoyama, T.., et al.

Chemical evolution of primordial salts and organic sulfur molecules in the asteroid (162173) Ryugu.
Nature Communications, 14, 5284, 2023.

Rufenacht, M., Morino, P., Lai, Y-J., Fehr, M., Haba, M.K., Schonbachler, M.

Genetic relationships of solar system bodies based on their nucleosynthetic Ti isotope compositions and sub-structures of the solar protoplanetary disk.

Nguyen, A.N., ... Gautam, I., ... Haba, M.K., ... Masuda, Y., ... Yokoyama, T., et al.

Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu.
Science Advances, 9, eadh1003, 2023.

Fujiya, W., ... Gautam, I., ... Haba, M.K., ... Masuda, Y., ... Yokoyama, T., et al.

Carbonate record of the change in oxygen fugacity and gaseous species in asteroid Ryugu.
Nature Geoscience, 16, 675-682, 2023.

Piani, L., ... Gautam, I., ... Haba, M.K., ... Masuda, Y., ... Yokoyama, T., et al.

Hydrogen isotopic composition of hydrous minerals in asteroid Ryugu.
Astrophysical Journal Letters, 946, L43 (11pp), 2023.

Masuda, Y., Yokoyama, T.

Strontium isotope evidence for the repeated formation of refractory inclusions in the Allende meteorite.
Geochimical et Cosmochimica Acta, 345, 50-61, 2023. doi: 10.1016/j.gca.2023.01.024

Yokoyama, T., Ohkuma, Y., Nishikawa, K., Sumiya, K., Gautam, I.

Evaluation of the residual mass fractionation in high-precision Cr isotopic analysis with TIMS.
Geostandards and Geoanalytical Research, 47, 415-435, 2023. doi: 10.1111/ggr.12479