Links to
NASA/ADS,
ORCID,
ResearchGate,
Google Scholar.
Refereed Journal and Books
Lead-Author Papers
9. "
Chemo-dynamical Evolution of Simulated Satellites for a Milky Way-like Galaxy"
Hirai, Y., Kirby, E. N., Chiba, M., Hayashi, K., Anguiano, B., Saitoh, T. R., Ishigaki, M. N., & Beers, T. C.
2024, The Astrophysical Journal, 970, 105
8. "
Origin of Highly r-Process-Enhanced Stars in a Cosmological Zoom-in Simulation of a Milky Way-like Galaxy"
Hirai, Y., Beers, T. C., Chiba, M., Aoki, W., Shank, D., Saitoh, T. R., Okamoto, T., & Makino, J.
2022, Monthly Notices of the Royal Astronomical Society, 517, pp.4856-4874
7. "
SIRIUS project. I. Star formation models for star-by-star simulations of star clusters and galaxy formation
"
Hirai, Y., Fujii, M. S., & Saitoh, T. R.
2021, Publications of the Astronomical Society of Japan, 73, pp.1036-1056
6. "
Enrichment of Strontium in Dwarf Galaxies
"
Hirai, Y., Wanajo, S., & Saitoh, T. R.
2019, The Astrophysical Journal, 885, 33
5. "
Understanding the Enrichment of Heavy Elements by the Chemodynamical Evolution Models of Dwarf Galaxies
"
Hirai, Y., 2019, Springer Theses
4. "
Enrichment of Zinc in galactic chemodynamical evolution models
"
Hirai, Y., Saitoh, T. R., Ishimaru, Y., & Wanajo, S.
2018, The Astrophysical Journal, 855, 63
3. "
Efficiency of metal mixing in dwarf galaxies
"
Hirai, Y., & Saitoh, T. R.
2017, The Astrophysical Journal Letters, 838, L23
2. "
Early chemo-dynamical evolution of dwarf galaxies deduced from enrichment of r-process elements
"
Hirai, Y., Ishimaru, Y., Saitoh, T. R., Fujii, M. S., Hidaka, J., & Kajino, T.
2017, Monthly Notices of the Royal Astronomical Society, 466, pp.2474-2487
1. "
Enrichment of r-process elements in dwarf spheroidal galaxies in chemo-dynamical evolution model
"
Hirai, Y., Ishimaru, Y., Saitoh, T. R., Fujii, M. S., Hidaka, J., & Kajino, T.
2015, The Astrophysical Journal, 814, 41
Co-Author Papers
19. "
Rapidly rotating Population III stellar models as a source of primary nitrogen
"
Tsiatsiou, S., Sibony, Y., Nandal, D., Sciarini, L.,
Hirai, Y., Ekström, S., Farrell, E., Murphy, L., Choplin, A., Hirsch, R., Chiappini, C.,Liu, B., Bromm, V., Groh, J., Meynet, G.
2024, Astronomy & Astrophysics, 687, A307
18. "
Candidate Members of the VMP/EMP Disk System of the Galaxy from the SkyMapper and SAGES Surveys
"
Hong, J., Beers, T. C., Lee, Y. S., Huang, Y.,
Hirai, Y., Cabrera Garcia, J., Shank, D., Xu, S., Yuan, H., Mardini, M. K., Catapano, T., Zhao, G., Fan, Z., Zheng, J., Wang, W., Tan, K., Zhao, J., Li, C.
2024, The Astrophysical Jpurnal Supplement Series, 273, 12
17. "
Simulations predict intermediate-mass black hole formation in globular clusters
"
Fujii, M. S., Wang, L., Tanikawa, A.,
Hirai, Y.
, Saitoh, T. R.,
2024, Science, 384, pp. 1488-1492
16. "
EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies
"
Xu, Y., Ouchi, M., Isobe, Y., Nakajima, K., Ozaki, S., Bouché, N. F., Wise, J. H., Emsellem, E., Kusakabe, H., Hattori, T., Nagao, T., Chiaki, G., Fukushima, H., Harikane, Y., Hayashi, K.,
Hirai, Y., Kim, J. H., Maseda, M. V., Nagamine, K., Shibuya, T., Sugahara, Y., Yajima, H., Aoyama, S., Fujimoto, S., Fukushima, K., Hatano, S., Inoue, A. K., Ishigaki, T., Kawasaki, M., Kojima, T., Komiyama, Y., Koyama, S., Koyama, Y., Lee, C.-H., Matsumoto, A., Mawatari, K., Moriya, T. J., Motohara, K., Murai, K., Nishigaki, M., Onodera, M., Ono, Y., Rauch, M., Saito, T., Sasaki, R., Suzuki, A., Takeuchi, T. T., Umeda, H., Umemura, M., Watanabe, K., Yabe, K., Zhang, Y.
2024, The Astrophysical Journal, 961, 49
15. "
Probing the Galactic halo with RR Lyrae stars - V. Chemistry, kinematics, and dynamically tagged groups
"
Cabrera Garcia, J., Beers, T. C., Huang, Y., Li, X.-Y., Liu, G., Zhang, H., Hong, J., Lee, Y. S., Shank, D., Gudin, D.,
Hirai, Y., Komater, D.,
2024, Monthly Notices of the Royal Astronomical Society, 527, pp.8973-8990
14. "
3D-Spatiotemporal Forecasting the Expansion of Supernova Shells Using Deep Learning toward High-Resolution Galaxy Simulations
"
Hirashima, K., Moriwaki, K., Fujii, M. S.,
Hirai, Y., Saitoh, T. R., Makino, J.,
2023, Monthly Notices of the Royal Astronomical Society, 526, pp.4054-4066
13. "
Dark matter halo properties of the Galactic dwarf satellites: implication for chemo-dynamical evolution of the satellites and a challenge to ΛCDM
"
Hayashi, K.,
Hirai, Y., Chiba, M., Ishiyama, T.,
2023, The Astrophysical Journal, 953, 185
12. "
EMPRESS. XI. SDSS and JWST Search for Local and z 4-5 Extremely Metal-poor Galaxies (EMPGs): Clustering and Chemical Properties of Local EMPGs
"
Nishigaki, M., Ouchi, M., Nakajima, K., Ono, Y., Rauch, M., Isobe, Y., Harikane, Y., Narita, K., Zahedy, F., Xu, Y., Yajima, H., Fukushima, H.,
Hirai, Y., Kim, J. H., Inoue, S., Kusakabe, H., Lee, C-H, Nagao, T., Onodera, M.,
2023, The Astrophysical Journal, 952, 11
11. "
EMPRESS. IX. Extremely Metal-poor Galaxies are Very Gas-rich Dispersion-dominated Systems: Will the James Webb Space Telescope Witness Gaseous Turbulent High-z Primordial Galaxies?
"
Isobe, Y., Ouchi, M., Nakajima, K., Ozaki, S., Bouché, N., Wise, J. H., Xu, Y., Emsellem, E., Kusakabe, H., Hattori, T., Nagao, T., Chiaki, G., Fukushima, H., Harikane, Y., Hayashi, K.,
Hirai, Y., Kim, J. H., Maseda, M. V., Nagamine, K., Shibuya, T., Sugahara, Y., Yajima, H., Aoyama, S., Fujimoto, S., Fukushima, K., Hashimoto, T., Hatano, S., Inoue, A. K., Ishigaki, T., Kawasaki, M., Kojima, T., Komiyama, Y., Koyama, S., Koyama, Y., Lee, C-H, Matsumoto, A., Mawatari, K., Moriya, T. J., Motohara, K., Murai, K., Nishigaki, M., Onodera, M., Ono, Y., Rauch, M., Saito, T., Sasaki, R., Suzuki, A., Takeuchi, T. T., Umeda, H., Umemura, M., Watanabe, K., Yabe, K., Zhang, Y.,
2023, The Astrophysical Journal, 951, 102
10. "
The Origin of the Large Magellanic Cloud Globular Cluster NGC 2005
"
Piatti, A. &
Hirai, Y.
2023, The Astronomical Journal, 165, 213
9. "
Insights on the Sun birth environment in the context of star-cluster formation in hub-filament systems
"
Arzoumanian, D., Arakawa, S., Kobayashi, M. I. N., Iwasaki, K., Fukada, K., Mori, S.,
Hirai, Y., Kunitomo, M., Kumar, N. M. S., & Kokubo, E.
2023, The Astrophysical Journal Letters, 947, L29
8. "
Chemo-Dynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP- s
and CEMP-no Stars
"
Zepeda, J., Beers, T. C., Placco, V. M., Shank, D., Gudin, D.,
Hirai, Y., Mardini, M., Pifer, C., Catapano, T., & Calagna, S.
2023, The Astrophysical Journal, 947, 23
7. "
EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
"
Matsumoto, A., Ouchi, M., Nakajima, K., Kawasaki, M., Murai, K., Motohara, K., Harikane, Y., Ono, Y., Kushibiki, K., Koyama, S., Aoyama, S., Konishi, M., Takahashi, H., Isobe, Y., Umeda, H., Sugahara, Y., Onodera, M., Nagamine, K., Kusakabe, H.,
Hirai, Y.,
Moriya, T. J.,
Shibuya, T., Komiyama, Y., Fukushima, K., Fujimoto, S., Hattori, T., Hayashi, K., Inoue, A. K., Kikuchihara, S., Kojima, T., Koyama, Y., Lee, C-H.,Mawatari, K., Miyata, T., Nagao, T., Ozaki, S., Rauch, M., Saito, T., Suzuki, A., Takeuchi, T. T., Umemura, M., Xu, Y., Yabe, K., Zhang, Y., & Yoshii, Y.
2022, The Astrophysical Journal, 941, 167
6. "
SIRIUS Project - IV. The formation history of the Orion Nebula Cluster driven by clump mergers
"
Fujii, M. S., Wang, L.,
Hirai, Y.,
Shimajiri, Y., Kumamoto, J.,
& Saitoh, T. R.
2022, Monthly Notices of the Royal Astronomical Society, 514, pp. 2513-2526
5. "
SIRIUS Project - V. Formation of off-centre ionized bubbles associated with Orion Nebula Cluster
"
Fujii, M. S., Hattori, K., Wang, L.,
Hirai, Y.,
Kumamoto, J., Shimajiri, Y.,
& Saitoh, T. R.
2022, Monthly Notices of the Royal Astronomical Society, 514, pp. 43-54
4. "
Neutron star mergers as the astrophysical site of the r-process in the Milky Way and its satellite galaxies
"
Wanajo, S.,
Hirai, Y.,
& Prantzos, N.
2021, Monthly Notices of the Royal Astronomical Society, 505, pp. 5862-5883
3. "
SIRIUS Project. III. Star-by-star simulations of star cluster formation using a direct N-body integrator with stellar feedback
"
Fujii, M. S.,
Saitoh, T. R.,
Hirai, Y.
& Wang, L.
2021, Publications of the Astronomical Society of Japan, 73, pp. 1074-1099
2. "
SIRIUS project. II. a new tree-direct hybrid code for smoothed particle hydrodynamics/N-body simulations of star clusters
"
Fujii, M. S.,
Saitoh, T. R.,
Wang, L., &
Hirai, Y.
2021, Publications of the Astronomical Society of Japan, 73, pp. 1057-1073
1. "
R-process enhancements of Gaia-Enceladus in GALAH DR3
"
Matsuno, T.,
Hirai, Y.,
Tarumi, Y.,
Hotokezaka, K.,
Tanaka, M.,
& Helmi, A.
2021, Astronomy & Astrophysics, 650, A110
Proceedings
13. "
Surrogate Modeling for Computationally Expensive Simulations of Supernovae in High-Resolution Galaxy Simulations
"
Hirashima, K.,
Moriwaki, K.,
Fujii, M. S.,
Hirai, Y.,
Saitoh, T. R.,
Makino, J., Ho, S.
2023,
NeurIPS 2023 AI for Science Workshop, 112
12. "
Formation process of the Orion Nebula Cluster
"
Fujii, M. S.,
Wang, L.,
Saitoh, T. R.,
Hirai, Y.,
& Shimajiri, Y.
2023,
Proceedings of the International Astronomical Union, 362, 258-261
11. "
Predicting the Expansion of Supernova Shells Using Deep Learning toward Highly Resolved Galaxy Simulations
"
Hirashima, K.,
Moriwaki, K.,
Fujii, M. S.,
Hirai, Y.,
Saitoh, T. R., &
Makino, J.
2023,
Proceedings of the International Astronomical Union, 362, 209-214
10. "
Predicting the Expansion of Supernova Shells for High-Resolution Galaxy Simulations Using Deep Learning
"
Hirashima, K.,
Moriwaki, K.,
Fujii, M. S.,
Hirai, Y.,
Saitoh, T. R., &
Makino, J.
2022,
Journal of Physics: Conference Series, 2207, 012050 (refereed)
9. "
Enrichment of Heavy Elements in Chemodynamical Evolution of Dwarf Galaxies
"
Hirai, Y.,
Wanajo, S., &
Saitoh, T. R.,
2020,
JPS Conference Proceedings, 31, 011009 (refereed)
8. "
Enrichment of Heavy Elements in Chemo-Dynamical Simulations of Dwarf Galaxies
"
Hirai, Y.,
Saitoh, T. R.,
Wanajo, S., &
Fujii, M. S.
2019,
Proceedings of the International Astronomical Union,
344,
197-200
7. "
Chemo-dynamical evolution of r-process elements in the Local Group galaxies
"
Hirai, Y., Ishimaru, Y., Saitoh, T. R., Fujii, M. S., Hidaka, J., & Kajino, T.
2017, JPS Conference Proceedings, 14, 020204 (refereed)
6. "
Chemo-dynamical evolution model: Enrichment of r-process elements in the Local Group dwarf galaxies "
Hirai, Y., Ishimaru, Y., Saitoh, T. R., Fujii, M. S., Hidaka, J., & Kajino, T.
2016, Proceedings of the International Astronomical Union, 11, S317, 308-309
5. "
Astrophysical site(s) of r-process elements in galactic chemodynamical evolution model "
Hirai, Y., Ishimaru, Y., Saitoh, T. R., Fujii, M. S., Hidaka, J., & Kajino, T.
2016, EPJ Web of Conferences, 109, 02001 (refereed)
4. "
Cosmological and supernova neutrinos
"
Kajino, T., Aoki, W., Balantekin, A. B., Cheoun, M.-K., Hayakawa, T., Hidaka, J., Hirai, Y., Kusakabe, M., Mathews, G. J., Nakamura, K., Pehlivan, Y., Shibagaki, S., & Suzuki, T.
2014, AIP Conference Proceedings, 1604, 193-200
3. "
Supernova neutrinos and explosive nucleosynthesis
"
Kajino, T., Aoki, W., Cheoun, M.-K., Hayakawa, T., Hidaka, J., Hirai, Y., Mathews, G. J., Nakamura, K., Shibagaki, S., & Suzuki, T.
2014, AIP Conference Proceedings, 1595, 84-97
2. "
Supernova constraints on neutrino oscillation and EoS for proto-neutron star"
Kajino, T., Aoki, W., Cheoun, M.-K., Hayakawa, T., Hidaka, J., Hirai, Y., Mathews, G. J., Nakamura, K., Shibagaki, S., & Suzuki, T.
2014, AIP Conference Proceedings, 1594, 319-325 (refereed)
1." Chemo-dynamical evolution of colliding dwarf spheroidal galaxies "
Hirai, Y., Kajino, T., Hidaka, J., Shibagaki, S., & Mathews, G. J.
2014, AIP Conference Proceedings, 1594, 58-63 (refereed)