GK Per 2015 dwarf nova covered by Suzaku
Takayuki Yuasa, Takayuki Hayashi, and Manabu Ishida

TL;DR
This study analyzes Suzaku X-ray observations of GK Per during its 2015 dwarf nova outburst, revealing changes in spin modulation, spectral features, and accretion geometry compared to quiescent states.
Contribution
First detailed temporal and spectral analysis of GK Per's 2015 outburst using Suzaku data, highlighting spin modulation evolution and spectral line variations.
Findings
Spin modulation confirmed with a 351.4 s period, detected in hard X-rays.
Increased Fe Kalpha line equivalent width during outburst.
Spectral modeling indicates sub-solar Fe abundance and high plasma temperature.
Abstract
The intermediate polar GK Per exhibited a dwarf nova outburst in March-April 2015. Suzaku X-ray telescope serendipitously captured the onset of the outburst during its pre-scheduled pointing observation spanning four days. In this paper, we present temporal and spectral analysis results of this outburst, together with those from archival data of quiescent obtained in 2009 and 2014. Our temporal analysis confirmed previously reported spin modulation of X-ray count rates in outburst with a WD spin period of P_WD=351.4+/-0.5 s. The modulation is also detected in the hard X-ray band (16-60 keV), and spectral modeling of the absorption suggests obscuration by a dense absorption with a line-of-sight column density of N_H>10^23 cm^-2. A complex time evolution of spin modulation profiles is seen; the spin minimum phase shifts from phase ~0.25 in the first half of the observation to ~0.65 in…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAstrophysical Phenomena and Observations · Astronomical Observations and Instrumentation · X-ray Spectroscopy and Fluorescence Analysis
