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Discovery of a strong 6.6 keV emission feature from EXO 1745248 after the superburst in 2011 October
Wataru B. Iwakiri, Motoko Serino, Tatehiro Mihara +4
We discover an unidentified strong emission feature in the X-ray spectrum of EXO 1745248 obtained by RXTE at 40 hr after the peak of a superburst. The structure was centered at…
Optical Variability Correlated with X-ray Spectral Transition in the Black-Hole Transient ASASSN-18ey = MAXI J1820+070
Keito Niijima, Mariko Kimura, Yasuyuki Wakamatsu +49
How a black hole accretes matter and how this process is regulated are fundamental but unsolved questions in astrophysics. In transient black-hole binaries, a lot of mass stored in…
On the nature of the anomalous event in 2021 in the dwarf nova SS Cygni and its multi-wavelength transition
Mariko Kimura, Shinya Yamada, Nozomi Nakaniwa +20
SS Cyg has long been recognized as the prototype of a group of dwarf novae that show only outbursts. However, this object has entered a quite anomalous event in 2021, which at firs…
Detailed Design of the Science Operations for the XRISM mission
Yukikatsu Terada, Matt Holland, Michael Loewenstein +36
XRISM is an X-ray astronomical mission by the JAXA, NASA, ESA and other international participants, that is planned for launch in 2022 (Japanese fiscal year), to quickly restore hi…
The RS CVn type star GT Mus shows most energetic X-ray flares throughout the 2010s
Ryo Sasaki, Yohko Tsuboi, Wataru Iwakiri +14
We report that the RS CVn-type star GT Mus (HR 4492, HD 101379 + HD 101380) was the most active star in the X-ray sky in the last decade in terms of the scale of recurrent energeti…
The Peculiar X-ray Transient Swift J0840.7-3516: an Unusual Low Mass X-ray Binary or a Tidal Disruption Event?
Megumi Shidatsu, Wataru Iwakiri, Hitoshi Negoro +9
We report on the X-ray properties of the new transient Swift J0840.73516, discovered with Swift/BAT in 2020 February, using extensive data of Swift, MAXI, NICER, and NuSTAR. The…