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From multi-epoch adaptive optics imaging and integral field unit spectroscopywe report the discovery of an expanding and narrowly confined bipolar shellsurrounding the helium nova V445 Puppis (Nova Puppis 2000). An equatorial dustdisc obscures the nova remnant, and the outflow is characterised by a largepolar outflow velocity of 6720 +/- 650 km/s and knots moving at even largervelocities of 8450 +/- 570 km/s. We derive an expansion parallax distance of8.2 +/- 0.5 kpc and deduce a pre-outburst luminosity of the underlying binaryof log L/L_Sun = 4.34 +/- 0.36. The derived luminosity suggests that V445Puppis probably contains a massive white dwarf accreting at high rate from ahelium star companion making it part of a population of binary stars thatpotentially lead to supernova Ia explosions due to accumulation of helium-richmaterial on the surface of a massive white dwarf.

The expanding bipolar shell of the helium nova V445 Puppis