GK_PER
Quasi-periodic oscillations (QPOs) are ubiquitously observed across a wide range of accreting systems. However, the physical mechanism responsible for QPOs remains unclear even in cataclysmic variables (CVs), the simplest accreting systems. Here, we propose a 160~ks ToO XRISM/Resolve observation of the magnetic CV GK Per during an outburst. This system exhibits QPOs with periods of several thousand seconds, and the predicted Doppler shift of the Fe K$\alpha$ fluorescence line at 6.4~keV, with an amplitude of ~20 eV, will allow us to distinguish between two competing scenarios: blobby accretion and precession of the warped inner disk. Our proposed observations will also enable an accurate measurement of the WD mass, providing an important test of the standard binary-evolution scenario.
obsid = 203047010 / Unique Observation/Sequence Number
object = GK_PER / Object name
pi_name = KIMURA MARIKO / Proposal Principal Investigator Name
ra = 52.7987873660861 / Right Ascension (Pointing Position) (deg)
dec = 43.9045730603515 / Declination (Pointing Position) (deg)
roll_angle = 65.0003946949784 / Roll Angle (deg)
start_time = 2026-08-08T09:34:04 / Start Time of the Observation
stop_time = 2026-08-12T03:11:04 / Stop Time of the Observation
exposure = 170307.15786 / Effective Total Observation Exposure (s)
public_date= 2099-12-31 / Public Date