SIMBAD references

2020ApJ...898L..40L - Astrophys. J., 898, L40-L40 (2020/August-1)

CTCV J2056-3014 an X-ray-faint intermediate polar harboring an extremely fast-spinning white dwarf.

LOPES DE OLIVEIRA R., BRUCH A., RODRIGUES C.V., OLIVEIRA A.S. and MUKAI K.

Abstract (from CDS):

We report on XMM-Newton X-ray observations that reveal CTCV J2056-3014 to be an unusual accretion-powered, intermediate polar (IP) system. It is a member of the class of X-ray-faint IPs whose space density remains unconstrained but potentially very high, with L_x,0.3-12 keV_ of 1.8 x 1031 erg s–1. We discovered a coherent 29.6 s pulsation in X-rays that was also revealed in our reanalysis of published optical data, showing that the system harbors the fastest-spinning, securely known white dwarf (WD) so far. There is no substantial X-ray absorption in the system. Accretion occurs at a modest rate (∼6 x 10–12 M yr–1) in a tall shock above the WD, while the star seems to be spinning in equilibrium and to have low magnetic fields. Further studies of CTCV J2056-3014 potentially have broad implications on the origin of magnetic fields in WDs, on the population and evolution of magnetic cataclysmic variables, and also on the physics of matter around rapidly rotating magnetic WDs.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Cataclysmic variable stars - X-ray binary stars - DQ Herculis stars

Simbad objects: 8

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2021.02.26-20:19:01

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