XMM-Newton observations of the dwarf nova YZ Cnc in quiescence

Abstract

We present results from the XMM observations of the dwarf nova YZ Cnc in a quiescent state. We have performed a detailed time series analysis of the resulting light curves. Unusually, we do not detect any orbital modulation in the UV, with only marginal evidence for X-ray modulation on this period. Although there are peaks in the X-ray periodograms at periods less than 5000 s, we attribute them to red noise effects and assign significance to them using a novel approach. The variability in the UV and optical bands can also be modelled as a result of aperiodic variability (red noise) in the system. There is evidence that the UV and X-ray fluxes are anti-correlated with a time delay of about 100 s, with the UV lagging behind the X-ray emission. This anti-correlation is intriguing, but is only present on two occasions lasting several 1000 s each. The X-ray spectrum shows similar emission features to other dwarf novae and is well fitted using a multi-temperature emission model. We measure a relatively high X-ray luminosity of ~1.4x10^{32} ergs/s, although this is consistent with a low binary inclination. Finally, we find evidence for a possible -1200km/s blue shift in the fitted Fe K line energies, possibly indicating the presence of an outflow in this low inclination system.

arXiv comment9 pages, accepted for publication in A&A

References in corpus (9)

• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• The XMM-Newton Optical/UV Monitor Telescope
• Bondi Accretion and the Problem of the Missing Isolated Neutron Stars
• High speed photometry of faint Cataclysmic Variables: II. RS Car, V365 Car,] V436 Car, AP Cru, RR Cha, BI Ori, CM Phe and V522 Sgr
• X-ray and UV observations of the dwarf nova VW Hyi in quiescence
• First XMM-Newton observations of a Cataclysmic Variable I: Timing studies of OY Car
• Chandra Observations of the Dwarf Nova WX Hyi in Quiescence
• First XMM-Newton observations of a cataclysmic variable II: the X-ray spectrum of OY Car
• XMM-Newton observations of OY Car III: OM light curve modelling, X-ray timing and spectral studies

Cited by in corpus (11)

• X-ray Emissions from Accreting White Dwarfs: a Review
• Variability in the CoRoT photometry of three hot O-type stars. HD 46223, HD 46150 and HD 46966
• The defining characteristics of Intermediate Polars - the case of three candidate systems
• RXTE determination of the intermediate polar status of XSS J00564+4548, IGR J17195-4100, and XSS J12270-4859
• XMM-Newton observations of AM CVn binaries
• Study of Fe K-alpha lines in Non-magnetic Cataclysmic Variables using Chandra HEG data
• Combined Chandra, XMM-Newton and Hubble Space Telescope observations of the Galactic globular cluster NGC 2808
• XMM-Newton Observations of the Cataclysmic Variable GW Lib
• Steps towards a solution of the FS Aurigae puzzle. I. Multicolour high-speed photometry with ULTRACAM
• Broad Observational Perspectives Achieved by the Accreting White Dwarf Sciences in the XMM-Newton and Chandra Eras
• Spectroscopic Study of SU UMa-type Dwarf Nova YZ Cnc during its 2002 Superoutburst