Kavli Affiliate: Moritz Guenther
| First 5 Authors: Sean J. Gunderson, David P. Huenemoerder, José M. Torrejón, Dustin K. Swarm, Joy S. Nichols
| Summary:
We investigated the temporal and spectral features of $gamma$ Cassiopeiae’s
X-ray emission within the context of the white dwarf accretion hypothesis. We
find that the variabilities present in the X-ray data show two different
signals, one primarily due to absorption and the other due to flickering like
in non-magnetic cataclysmic variables. We then use this two-component insight
to investigate previously un-reported simultaneous XMM and NuSTAR data. The
model fitting results find white dwarf properties consistent with optical
studies alongside a significant secondary, thermal source. We propose a
secondary shock between the Be decretion disk and white dwarf accretion disk as
the source. Finally, we analyzed a unique, low-count rate event of the XMM
light curve as potential evidence for the white dwarf encountering Be decretion
disk structures.
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