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Near the center of the Puppis A SNR a series of nested optically emittingrings of high velocity ejecta (known as `the Swirl') were identified severaldecades ago by Winkler et al. (1989). To date no follow-up observations ofthese rings have been published, and their physical origin has remained amystery. We present results of integral field spectroscopy of the Swirl usingthe Wide Field Integral Spectrograph (\wifes) on the 2.3\,m telescope at SidingSpring Observatory in Australia. The outermost ring exhibits a nitrogen-richspectrum blueshifted to 1350 km/s, with smaller blueshifted rings within thefirst exhibiting mostly oxygen-rich spectra moving at 1000 km/s and 750 km/s.The structures are connected by material of intermediate velocity and variablecomposition, including sulfur-rich material. The Swirl is turbulent and shockexcited, and contains as much as 0.5 M$_{\odot}$ of metal-rich material. Thechemical composition and exclusively blueshifted radial velocities of the Swirlare consistent with progressively deeper nucleosynthetic layers in a massiveprogenitor star. We suggest the possibility that the Swirl marks a `funnel'carved into the supernova ejecta by a close, massive binary companion at themoment of explosion.

The Peculiar Ejecta Rings in the O-Rich Supernova Remnant Puppis A: Evidence of a Binary Interaction?