平居悠

English

Links to NASA/ADS, ORCID, ResearchGate, Google Scholar.

Refereed Journal and Books
Lead-Author Papers
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, 2474

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
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., Komaster, 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
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

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)

解説記事
1. " 銀河の化学力学進化から探るrプロセス起源天体 "
平居悠
天文月報, 第109巻, 479-488, (2016年7月号)