The structure of a recent nova shell as observed by ALMA

Abstract

High resolution ALMA observations of the recent (2.52 yrs old) shell of Nova V5668 Sgr (2015) show a highly structured ionised gas distribution with small (10${}^{15}$ cm) clumps. These are the smallest structures ever observed in the remnant of a stellar thermonuclear explosion. No extended contiguous emission could be found above the 2.5 $\sigma$ level in our data, while the peak hydrogen densities in the clumps reach 10${}^6$ cm${}^{-3}$. The millimetre continuum image suggests that large scale structures previously distinguished in other recent nova shells may result from the distribution of bright unresolved condensations.

arXiv comment4 pages, 3 figures

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