Discovery of the magnetic cataclysmic variable XMM J152737.4-205305.9 with a deep eclipse-like feature
arxiv(2024)
Abstract
In this study, we report a discovery from XMM-Newton, which involves the
identification and subsequent examination of a newly discovered polar-type
cataclysmic variable named XMM J152737.4-205305.9. The discovery was made by
matching the XMM-Newton data archive with the cataclysmic variable candidate
catalog provided by Gaia Data Release 3. The utilization of X-ray photometry
has led to the identification of two distinct dips that exhibit a recurring
pattern with a precise period of 112.4(1) minutes in two XMM-Newton
observations that are one year apart. The data obtained from the photometry of
Zwicky Transient Facility (ZTF) and ATLAS surveys consistently indicate the
presence of the different mass accretion states of up to 2 mag. Following the
optical data, the SRG(Spectrum Roentgen Gamma)/eROSITA All Sky Survey
observed the system in two different X-ray levels which may imply different
accretion states. Following these observations, the low-resolution spectrum
obtained using SALT spectroscopy exposes the prominent hydrogen Balmer and
helium emission lines, strongly supporting that the system belongs to the
category of polar-type magnetic cataclysmic variable. The XMM-Newton
observations, conducted under various conditions of X-ray levels, reveal a
consistent pattern of a deep dip-like feature with a width of ≈ 9.1
min. This feature implies the presence of an eclipse in both observations.
According to Gaia data, the object is located at a distance of
1156^+720_-339,pc, and its X-ray luminosity lies within the L_ X=
(3-6)×10^31 range.
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