Research areas	Planetary Science, Theoretical Astrophysics, Astronomy
Keywords	Planet and Satellite Formation, Protoplanetary Disk
Themes
Major publications	H. Hayakawa, Y. I. Fujii, ... et al., Three case reports on the cometary plasma tail in the historical documents. Journal of Space Weather and Space Climate, in press, 2021. K. Murata, K. Ichikawa, Y. I. Fujii, H. Hayakawa, Y. Cheng, Y. Kawamoto, H. Sano, Cometary records revise Eastern Mediterranean chronology around 1240 CE. Publications of the Astronomical Society of Japan, psaa114, 2021. Y. I. Fujii, M. Ogihara, Formation of single-moon systems around gas giants. Astronomy & Astrophysics, 635, L4 (4pp), 2020. Y. Hirao, ..., Y. I. Fujii, ... et al., OGLE-2017-BLG-0406: Spitzer microlens parallax reveals Saturn-mass planet orbiting M-dwarf host in the inner Galactic disk. The Astronomical Journal, 160, 74 (20pp), 2020. J. A. Hitchcock, ..., Y. I. Fujii, ... et al., Large-scale cloud coverage in the ϵ Indi Ba and Bb system. Monthly Notices of the Royal Astronomical Society, 495, 3881-3899, 2020. W. Zang, ..., Y. I. Fujii, ... et al., Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge. The Astrophysical Journal, 891, 3 (11pp), 2020. J. Southworth, ..., Y. I. Fujii, ... et al., Transit timing variations in the WASP-4 planetary system. Monthly Notices of the Royal Astronomical Society, 490, 4230-4236, 2019. S. Li, ..., Y. I. Fujii, ... et al., OGLE-2017-BLG-1186: First application of asteroseismology and Gaussian processes to microlensing. Monthly Notices of the Royal Astronomical Society, 488, 3308-3323, 2019. R. A. Street, ..., Y. I. Fujii, ... et al., OGLE-2018-BLG-0022: A nearby M-dwarf binary. The Astronomical Journal, 157, 215 (11pp), 2019. Y. Shvartzvald, ..., Y. I. Fujii, ... et al., Spitzer Microlensing parallax for OGLE-2017-BLG-0896 reveals a counter-rotating low-mass brown dwarf. The Astronomical Journal, 157, 106 (8pp), 2019. A. Udalski ..., Y. I. Fujii, ... et al., OGLE-2017-BLG-1434Lb: Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function. ACTA ASTRONOMICA, 68, 1-42, 2018. Y. I. Fujii, H. Kobayashi, S. Z. Takahashi, O. Gressel, Orbital evolution of moons in weakly accreting circumplanetary disks. The Astronomical Journal, 153, 194 (10pp), 2017. B. P. Abbott, ..., Y. I. Fujii, ... et al., Multi-messenger observations of a binary neutron star merger. The Astrophysical Journal Letters, 848, L12 (59pp), 2017. N. R. Tanvir, ..., Y. I. Fujii, ... et al., The Emergence of a lanthanide-rich kilonova following the merger of two neutron stars. The Astrophysical Journal Letters, 848, L27 (9pp), 2017. Y. I. Fujii, S. Okuzumi, T. Tanigawa, S. Inutsuka, On the viability of the magnetorotational instability in circumplanetary disks. The Astrophysical Journal, 785, 101 (8pp), 2014. Y. I. Fujii, S. Okuzumi, S. Inutsuka, A fast and accurate calculation scheme for ionization degrees in protoplanetary and circumplanetary disks with charged dust grains. The Astrophysical Journal, 743, 53 (9pp), 2011.
Professional societies/Research and synergic activities	THE ASTRONOMICAL SOCIETY OF JAPAN THE JAPANESE SOCIETY FOR PLANETARY SCIENCES JAPAN GEOSCIENCE UNION THE SOCIETY FOR THE STUDY OF THE ORIGIN AND EVOLUTION OF LIFE-JAPAN Division for Planetary Sciences of the American Astronomical Society
Teaching Areas	Undergraduate courses Graduate courses (Master's program) Graduate courses (Doctor's program) Undergraduate courses open to all departments
Background	Apr 2012 - Mar 2015 JSPS fellow (DC1), Nagoya University Apr 2015 - Jun 2015 Research Scientist, Earth-Life Science Institute, Tokyo Institute of Technology Jul 2015 - Mar 2017 Postdoctoral Fellow, Niels Bohr International Academy, Niels Bohr Institute Apr 2017 - Mar 2018 Visiting Assistant Professor, Niels Bohr International Academy, Niels Bohr Institute Apr 2017 - Dec 2020 Designated Assistant Professor (S-YLC Fellow), Institute For Advanced Research/Graduate School of Science, Nagoya University Jan 2021 - Assistant Professor, Graduate School of Human and Environmental Studies, Kyoto University

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