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Tracing the Orbital Motion of the Accreting White Dwarf in EX~Hydrae with XRISM/Resolve
Yuken Ohshiro, Yukikatsu Terada, Taichi Ichikawa +7
Measuring the masses of accreting white dwarfs (WDs) is crucial for understanding their evolution and the physics of accretion. High-resolution X-ray spectroscopy can trace the WD…
Plasma Dynamics of Radiative Cooling Accretion Flow in AM Herculis with XRISM
Yukikatsu Terada, Kaya Mori, Takayuki Hayashi +14
We present XRISM/Resolve high-resolution X-ray spectroscopy of the prototypical magnetic cataclysmic variable AM Herculis. All satellite lines of highly ionized Fe are fully resolv…
Disk instability model incorporating a variable inner disk radius in SS Cyg and U Gem
Mariko Kimura, Osaki Yoji
Previous theoretical studies indicate that the inner disk in dwarf novae evaporates into a high-temperature, optically thin, and geometrically thick accretion flow during quiescenc…
Spectral and photometric variability of SS 433 observed with XRISM and simultaneous optical and near-infrared telescopes
Yusuke Sakai, Shinya Yamada, Yuta Okada +36
We present results from coordinated multiwavelength observations of the SS 433, obtained with XRISM, optical telescopes, and near-infrared camera during 2024 April and 2025 March.…
Evolution of the inner accretion flow and the white-dwarf spin pulse during the 2023 outburst in GK Persei
Mariko Kimura, Takayuki Hayashi, Yuuki Wada +8
We present our X-ray and optical observations performed by NICER, NuSTAR, and Tomo-e Gozen during the 2023 outburst in the intermediate polar GK Persei. The X-ray spectrum consiste…
Evolution of X-ray and optical rapid variability during the low/hard state in the 2018 outburst of MAXI J1820+070 = ASASSN-18ey
Mariko Kimura, Hitoshi Negoro, Shinya Yamada +3
We performed shot analyses of X-ray and optical sub-second flares observed during the low/hard state of the 2018 outburst in MAXI J1820070. Optical shots were less spread than X…