XMM Spectroscopy of the Transient Supersoft Source RX J0513.9-6951: probing the dynamic white dwarf photosphere

Abstract

The highly luminous (> 10^37 erg s^-1) supersoft X-ray sources (SSS) are believed to be Eddington limited accreting white dwarfs undergoing surface hydrogen burning. The current paradigm for SSS involves thermally unstable mass transfer from a 1-2 solar mass companion. However this model has never been directly confirmed and yet is crucial for the evolution of cataclysmic variables in general, and for the establishment of SSS as progenitors of type Ia supernovae in particular. The key SSS is RX J0513.9-6951 which has recurrent X-ray outbursts every 100-200 d (lasting for ~40 d) during which the optical declines by 1 mag. We present the first XMM-Newton observations of RX J0513.9-6951 through one of its optical low states. Our results show that as the optical low state progresses the temperature and the X-ray luminosity decrease, behaviour that is anti-correlated with the optical and UV emission. We find that as the optical (and UV) intensity recover the radius implied by the spectral fits increases. The high resolution spectra show evidence of deep absorption features which vary during the optical low state. Our results are consistent with the predictions of the white dwarf photospheric contraction model proposed by Southwell et al. 1996.

arXiv comment14 pages, 8 figures, 4 tables, accepted for publication in MNRAS

References in corpus (18)

• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• The XMM-Newton Optical/UV Monitor Telescope
• Black Hole Winds
• The nature and origin of Seyfert warm absorbers
• The Milky Way in X-rays for an outside observer: Log(N)-Log(S) and Luminosity Function of X-ray binaries from RXTE/ASM data
• EXPERIMENTAL LIMITS ON THE DARK MATTER HALO OF THE GALAXY FROM GRAVITATIONAL MICROLENSING.
• The nature of the supersoft X-ray source RX~J0513--69
• On the Column Density of AGN Outflows: the Case of NGC 5548
• RX J0513.9-6951: The first example of accretion wind evolution, a key evolutionary process to Type Ia supernovae
• NLTE Model Atmosphere Analysis of the LMC Supersoft X-ray Source CAL 83
• The origin of the Fe K features in Markarian 205 and Markarian 509
• Structures in the Mirror Universe
• A new clue to the transition mechanism between optical high and low states of the supersoft X-ray source RX J0513.9-6951, implied from the recurrent nova CI Aquilae 2000 outburst model
• Catalog of Luminous Supersoft X-ray Sources
• A High Resolution Spectroscopic Observation of CAL 83 with XMM-Newton/RGS
• The X-ray off-state of the supersoft source CAL 83 and its interpretation
• A New Orbital Ephemeris and Reinterpretation of Spectroscopic Data for the Supersoft X-ray Binary RX J0513.9-6951
• FUV Spectroscopy of the Supersoft X-ray Binary RX J0513.9-6951

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• Limits on the X-ray and optical luminosity of the progenitor of the type Ia supernova SN2007sr
• Optical and X-ray Properties of CAL 83: I. Quasi-periodic Optical and Supersoft Variability
• The Spectral and Temporal Properties of Transient Sources in Early-Type Galaxies
• Variability in the cycle length of the supersoft source RX J0513.9-6951
• Application of hydrostatic local thermodynamic equilibrium atmosphere models to interpretations of supersoft X-ray source spectra
• Revisiting multiwavelength data on the supersoft X-ray source CAL 83
• Examining the evolution of the Supersoft X-ray Source RX J0513.9-6951
• X-ray stellar population of the LMC