Yutaka Hirai

Invited Talks
11. "The Formation of the Milky Way and Gold-Rich Stars"
Hirai, Y.,
Mexborough & Swinton Astronomical Society, Mexborough, UK, April 4, 2024

10. "Chemical Evolution of Galaxies in the Local Group"
Hirai, Y.,
The 1st IReNA-Ukakuren Joint Workshop “Advancing Professional Development in Nuclear Astrophysics and Beyond”, Mitaka, Japan, August 28–September 1, 2023

9. "The History of the Milky Way"
Hirai, Y.,
Kalamazoo Astronomical Society General Meeting, Kalamazoo, USA, May 5, 2023

8. "Chemo-dynamical evolution of the Milky Way"
Hirai, Y.,
MODEST-23 JM, Onna, Japan, April 17-19, 2023

7. "Origin of r-process elements and the Milky Way formation"
Hirai, Y.,
UKAKUREN-RCNP Conference on AstroNuclear Physics (ANP2022), Osaka, Japan, July 20-21, 2022

6. "Numerical models of the r-process"
Hirai, Y.,
RR Lyrae Stars, Galactic Structure and Chemistry , Pasadena, USA, June 10-11, 2022

5. "Galactic Archaeology with Heavy Elements"
Hirai, Y.,
NAOJ Division of Science + Center for Computational Astrophysics workshop 2020, online, December 14-15, 2020

4. "Prospects for Simulations of Galaxy Formation"
Hirai, Y.,
CfCA Users' Meeting 2019 , Mitaka, Japan, January 20-21, 2020

3. "Galactic Chemical Evolution and the r-process"
Hirai, Y.,
Nuclear physics of the r-process , Kyoto University, Kyoto, Japan, May 22-24, 2019

2. "Origin and Evolution of r-process Elements"
Hirai, Y.,
First Stars and First Galaxies Workshop , Ibaraki University, Mito, Japan, November 19-21, 2018

1. "Enrichment of Heavy Elements in the Local Group Galaxies"
Hirai, Y.,
Taiwanese Theoretical Astrophysics Workshop , ASIAA, Taipei, Taiwan, September 25-27, 2018

International Conferences and Workshops
33. "Simulations Resolving Individual Stars (SIRIUS) Project: Toward Understanding the Origins of Carbon"
Hirai, Y.,
IReNA/NAOJ workshop "Astrophysical Origins of Carbon", Mitaka, Japan, September 2-5, 2024, oral

32. "Galaxy Formation Simulations and Galactic Archaeology in JWST and ELTs Era"
Hirai, Y.,
ELT Science in Light of JWST, Sendai, Japan, June 3-7, 2024, oral

31. "Subaru PFS Mock Observations of Satellites in a Cosmological Zoom-in Simulation"
Hirai, Y.,
Formation and Evolution of the Galaxies with Subaru PFS: Satellite workshop, Mitaka, Japan, March 9-10, 2024, oral

30. "Chemo-dynamical evolution of satellites around a Milky Way-like galaxy"
Hirai, Y.,
Dark Matter in the Universe: The Present and Future of Galactic Archaeology and Near-field Cosmology, Matsushima, Japan, March 1-3, 2024, oral

29. "SIRIUS Project: Star-by-Star Simulations of Star Clusters and Galaxies"
Hirai, Y.,, Fujii, M. S., Saitoh, T. R., Wang, L.
The 241st meeting of the American Astronomical Society, Seattle, USA, January 8-12, 2023, oral

28. "Origin of r-process enhanced stars in cosmological zoom-in simulations of Milky Way-like galaxies"
Hirai, Y.,, Beers, T. C., Chiba, M., Aoki, W., Shank, D., Saitoh, T. R., Okamoto, T., & Makino, J.
The 240th meeting of the American Astronomical Society, Pasadena, USA, June 12-16, 2022, oral

27. "Origin of r-process enhanced stars in simulations of Milky Way-like galaxies"
Hirai, Y.,, Beers, T. C., Chiba, M., Aoki, W., Shank, D., Saitoh, T. R., Okamoto, T., & Makino, J.
2022 JINA-CEE Frontiers in Nuclear Astrophysics, South Bend, USA, May 23-27, 2022, oral

26. "Chemodynamical evolution of dwarf galaxies based on cosmological zoom-in simulations: Perspective for PFS survey"
Hirai, Y.,
PFS 13th collaboration meeting, online, S08, March 22-24, 2022, poster

25. "Chemo-dynamical evolution of the Milky Way and dwarf galaxies"
Hirai, Y.,
2020 meeting of the JSPS-CAS collaboration program "Origin of the Milky Way halo structure explored with LAMOST and Subaru", online, June 23-24, 2020, oral

24. "s-process elements in dwarf galaxies"
Hirai, Y.,
Japan-Germany Joint Workshop on Chemical Evolution in the Early Universe , online, May 25, 2020, oral

23. "Chemo-dynamical evolution of the Local Group galaxies"
Hirai, Y.,
JINA-CEE IRENA/NAOJ workshop , Mitaka, Japan, December 3-4, 2019, oral

22. "Enrichment of heavy elements in chemodynamical evolution models"
Hirai, Y.,
The 15th International Symposium on Origin of Matter and Evolution of Galaxies , Kyoto, Japan, July 2-5, 2019, oral

21. "Enrichment of Heavy Elements in Local Group Galaxies"
Hirai, Y.,
6th Galaxy Evolution Workshop , Kashiwa, Japan, June 5-7, 2019, oral

20. "Metal Mixing in Galaxies as a Probe of Understanding Signatures from First Stars"
Hirai, Y.,
Stellar Archaeology as a Time Machine to the First Stars , Kashiwa, Japan, December 3-7, 2018, oral

19. "Understanding the Enrichment of Heavy Elements by Galactic Chemo-Dynamical Evolution Models"
Hirai, Y.,
Chemical evolution and nucleosynthesis across the Galaxy , Heidelberg, Germany, November 26-29, 2018, oral

18. "Enrichment of heavy elements in chemo-dynamical simulations of dwarf galaxies"
Hirai, Y., Saitoh, T. R., Wanajo, S., & Fujii, M. S.,
XXXth General Assembly of the International Astronomical Union , Vienna, Austria, August 20-31, 2018, poster

17. "Chemodynamical evolution of dwarf galaxies"
Hirai, Y.,
The Japan-France Workshop “Neutron Star Mergers and Galactic Chemical Evolution” , NAOJ, Tokyo, Japan, October 19-20, 2017, oral

16. " Constraints on the efficiency of metal mixing in galaxies through the chemical abundances of metal-poor stars"
Hirai, Y., and Saitoh, T. R.
2017 Asia-Pacific Regional IAU Meeting , S2-10-3, Taipei International Convention Center, Taipei, Taiwan, July 3-7, 2017, oral

15. " Formation and evolution of the Milky Way halo — Implication from the r-process abundances —"
Hirai, Y., Ishimaru, Y., Saitoh, T. R., and Fujii, M. S.
European Week of Astronomy and Space Science , S7.13, Faculty of Law, Charles University, Prague, Czech Republic, June 26-30, 2017, poster

14. " Towards understanding the Milky Way formation: Insight from the enrichment of r-process elements"
Hirai, Y.
The Milky Way and its environment, Institut d'Astrophysique de Paris, Paris, France, September 19-23, 2016, poster

13. " Chemo-dynamical evolution of r-process elements in the Local Group galaxies"
Hirai, Y., Ishimaru, Y., Saitoh, T. R., Fujii, M. S., Hidaka, J., and Kajino, T.
Nuclei in the Cosmos XIV , PS2-020, Toki Messe, Niigata, Japan, June 19-24, 2016, poster

12. " Chemo-dynamical evolution of the Local Group dwarf galaxies: The origin of r-process elements"
Hirai, Y.,
The Interplay between Local and Global Processes in Galaxies , 29, Cozumel, Mexico, April 11-15, 2016, poster

11. " 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., and Kajino, T.
IAU XXIX General Assembly Symposium 317, p.26, Honolulu, Hawaii, USA, August 3-9, 2015, poster

10 "Explosive nucleosynthesis: A probe of cosmic and supernova neutrinos"
Kajino, T., Shibagaki, S., Hirai, Y., Mathews, G. J., Hidaka, J., Hayakawa, T., Nishimura, S., Lorusso, G.
The 13th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG2015) , 68, Beijing, China, June 24-27, 2015, oral

9. "Astrophysical site(s) of r-process elements in galactic chemo-dynamical evolution model"
Hirai, Y., Ishimaru, Y., Saitoh, T. R., Fujii, M. S., Hidaka, J., and Kajino, T.
The 13th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG2015) , 38, Beijing, China, June 24-27, 2015, oral

8. " Enrichment of r-process elements in dwarf spheroidal galaxies with chemical and dynamical evolution model"
Hirai, Y., Ishimaru, Y., Saitoh, T. R., Fujii, M. S., & Kajino, T.
The Fourth Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and the Physical Society of Japan, KD4, Waikoloa, Hawaii, U.S., October 7-11, 2014, oral

7. "Chemo-Dynamical Evolution of Dwarf Spheroidal Galaxies"
Hirai, Y., Hidaka, J., Saitoh, T. R., Fujii, M., Shibagaki, S., Mathews, G. J., & Kajino, T.
The 11th Russbach School on Nuclear Astrophysics , Russbach, Austria, March 9-15, 2014, oral

6. " Cosmological and Supernova Neutrinos and Nucleosynthesis"
Kajino, T., Yamazaki, D. G., Ichiki, K., Mathews, G. J., Aoki, W., Fujiya, W., Cheoun, M. K., Suzuki, T., Otsuka, T., Balantekin, B., Deliduman, Y., Hayakawa, T., Chiba, S., Hidaka, J., Shibagaki, S., Hirai, Y.
27th Texas Symposium on Relativistic Astrophysics, Dallas , Dallas, TX, USA, December 8-13, 2013, oral

5. "Chemo-Dynamical Evolution of Dwarf Spheroidal Galaxies"
Hirai, Y., Kajino, T., Hidaka, J., Shibagaki S, and Mathews G. J.
The 12th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG12) , 18, Tsukuba, Japan, November 2013, poster

4. "Implication of Lunar Crustal Origin"
Hasebe, N., Kusano, H., Nagaoka, H., Fujibayashi, Y., Hirai, Y., Ideguchi, Y., Hareyama, M., Karouji, Y., Kobayashi, S., Kim, K. J., Gasnault, O., Forni, O., Reedy, R., Yamashita, N., Dohm, J. M.
10th Annual Meeting of Asia Oceania Geoscience Society PS12-A015, Brisbane, Australia, June 24-28, 2013, oral

3. "Elemental Composition of the Lunar Surface -- KAGUYA Gamma-Ray Spectrometer Observation --"
Hasebe, N., Nagaoka, H., Hirai, Y., Fujibayashi, Y., Shibamura, E., Kusano, H., Hareyama, M., Karouji, Y., Okada, T., Kobayashi, S., Kobayashi, M., Yamashita, N., Reedy, R., Kim, K. J., d’ Uston, C., Forni, O., Gasnault, O., and Dohm, J.
29th International Symposium on Space Technology and Science (ISTS), 2013-k-16, Nagoya, Aichi, Japan, June 2-9, 2013, oral 

2. "Global distribution of natural radioactive elements observed by Kaguya Gamma-Ray Spectrometer"
Hasebe, N, Kusano, H., Nagaoka, H., Fujibayashi, Y., Hirai, Y., Ideguchi, Y., Hareyama, M., Karouji, Y., Kobayashi, S., Kim, K. J., d'Uston, C., Gasnault, O., Forni, O., Reedy, R., Yamashita, N., & Dohm, J.
International Symposium on Remote Sensing (ISRS) 2013 , B2, Makuhari seminar house (Chiba, Japan), May 15-17, 2013, oral

1. " The Relationship between the Radioactive Elements and Eruption Ages of Lunar Mare Basalts "
Hirai, Y., Karouji, Y., Hareyama, M., Nagaoka, H., Fujibayashi, Y., Kamata, S., Morota, T., Kobayashi, S., & Hasebe, N.
SELENE Symposium 2013 , P5, ISAS/JAXA (Sagamihara, Japan), January 23-25, 2013, poster

---