Shock shaping? Nebular spectroscopy of nova V906 Carinae

V906 Carinae was one of the best observed novae of recent times. It was a prolific dust producer and harboured shocks in the early evolving ejecta outflow. Here, we take a close look at the consequences of these early interactions through study of high-resolution Ultraviolet and Visual Echelle spectrograph spectroscopy of the nebular stage and extrapolate backwards to investigate how the final structure may have formed. A study of ejecta geometry and shaping history of the structure of the shell is undertaken following a spectral line SHAPE model fit. A search for spectral tracers of shocks in the nova ejecta is undertaken and an analysis of the ionized environment. Temperature, density, and abundance analyses of the evolving nov a shell are presented.

Automated summary

V906 Carinae is one of the best observed novae recently, with prolific dust production and shocks in the early ejecta outflow. This study examines the consequences of these early interactions through high-resolution Ultraviolet and Visual Echelle spectrograph spectroscopy, and investigates the formation of the final structure through extrapolation. The geometry and shaping history of the shell structure are analyzed using a spectral line SHAPE model fit, and spectral tracers of shocks and ionized environment are examined. Temperature, density, and abundance analyses of the evolving nova shell are presented.