Self-shielding of Soft X-rays in SN Ia Progenitors

Abstract

There are insufficient super soft (~ 0.1 keV) X-ray sources in either spiral or elliptical galaxies to account for the rate of explosion of Type Ia supernovae in either the single degenerate or the double degenerate scenarios. We quantify the amount of circumstellar matter that would be required to suppress the soft X-ray flux by yielding a column density in excess of 10^{23} cm^{-2}. We summarize evidence that appropriate quantities of matter are extant in SN Ia and in recurrent novae that may be supernova precursors. The obscuring matter is likely to have a large, but not complete, covering factor and to be substantially non-spherically symmetric. Assuming that much of the absorbed X-ray flux is re-radiated as black-body radiation in the UV, we estimate that fewer than 100 sources might be detectable in the GALEX all sky survey.

10 pages, 5 figures, submitted to the Astrophysical Journal, not yet refereed

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• Spectropolarimetry of Supernovae
• PTF11kx: A Type-Ia Supernova with a Symbiotic Nova Progenitor
• Variable Sodium Absorption in a Low-Extinction Type Ia Supernova
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Cited by in corpus (6)

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• Evolution of Helium Star - White Dwarf Binaries Leading up to Thermonuclear Supernovae
• Attenuation of super-soft X-ray sources by circumstellar material