Slingshot prominences during dwarf nova outbursts?

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Abstract
Two dwarf novae, IP Peg and SS Cyg, were observed with the William Herschel Telescope at La Palma as part of a spectropolarimetric study on cataclysmic variables. We present phase-resolved spectroscopy, covering almost a full orbit, of these systems during their outburst state, and use Doppler tomography to map the observed emission lines. Secondary star emission is strong for both systems, especially in the Balmer lines. The IP Peg accretion disc emission is clearly asymmetric. Both systems also display peculiar low-velocity emission components in several emission lines, producing emission spots near the origin of the Doppler maps. We investigate these components and discuss possible sources of this emission. We propose slingshot prominences as a possible interpretation of this stationary emission and discuss this model in more detail. The observed emission can be attributed to prominence material at a temperature of 2 × 104 K and a number density of 1012 cm−3 . We find that kG fields for the secondary star are sufficient to store the ∼ 1018 g in a typical prominence.

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