- 2023 - 2027 Study of the expansion and contraction of the upper atmosphere realized by the world's first dedicated atmospheric X-ray observation instrument aboard the ISS
- 2021 - 2026 Toward understanding progenitors and explosion physics of core-collapse supernovae by mutual studies between observations and numerical simulations
- 2020 - 2024 A supernova view on evolution of massive stars in the final decade: synergy between rapid spectroscopic observations and comprehensive theory
- 2020 - 2023 New development in researches of the solar corona and the Earth upper atmosphere with Suzaku and XRISM
- 2017 - 2021 The evolution of massive stars toward supernovae: from the last century to the final year
- 2016 - 2019 Probing the relation between progenitors and maximum brightness for Type Ia supernovae through X-ray and optical observations of supernova remnants
- 2013 - 2016 Pioneering high-resolution X-ray spectroscopy of supernova remnants using dispersive spectrometers and the calorimeter onboard ASTRO-H
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