"Understanding the triggers of accretion state transitions is a fundamental goal across compact accreting systems (CVs, X-ray binaries, and AGNs). To solve this question, observing the change in accretion structure is indispensable. High-resolution X-ray spectroscopy of Fe I fluorescent lines serves as a primary probe of accretion geometry via reflection off cold gas. Cataclysmic variables (CVs) are ideal laboratories for isolating these reflection features because they are unaffected by general relativistic distortions or extreme relativistic outflows. However, complex multi-component line profiles have hindered interpretation across XRISM CV targets, with clear state-dependent modeling achieved only in the non-magnetic CV SS Cyg (Ishida et al. 2026)."
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '903002010' / Observation identification string OBJECT = 'GK_PER ' / Object name OBSERVER= 'MARIKO KIMURA' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 52.8 / [deg] Object Right ascension DEC_OBJ = 43.9043 / [deg] Object Declination RA_PNT = 52.7994144033534 / Pointing RA DEC_PNT = 43.9017178228438 / Pointing DEC RA_NOM = 52.8003260121654 / [deg] Nominal aspect point R.A. DEC_NOM = 43.9042023635966 / [deg] Nominal aspect point Dec. PA_NOM = 65.0030244266968 / [deg] Nominal aspect point roll. TELAPSE = 116484 / Elapsed time DATE-OBS= '2026-09-06T04:03:11' / Start date DATE-END= '2026-09-07T12:24:35' / Stop date ONTIME = 54153.43759 / On-source time EXPOSURE= 54153.43759 / Exposure time PROCVER = '03.03.015.013' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_26Sep2025_V6.36_XRISM_12Sep2025_V003' / Version of HEADAS used CALDBVER= 'gen20241115_xtd20260315_rsl20260315' / Version of CALDB used DATE = '2026-09-18T14:08:11' / Date and time this file was created or updated SIB2_VER= 'V04.00 ' / SIB2 version JAXA