University of Minnesota
School of Physics & Astronomy
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Charles E. Woodward

CK Vul: a smorgasbord of hydrocarbons rules out a 1670 nova (and much else besides)
Evans, A.; Gehrz, R. D.; Woodward, C. E.; Sarre, P. J.; van Loon, J. T.; Helton, L. A.; Starrfield, S.; Eyres, S. P. S., Monthly Notices of the Royal Astronomical Society

Download from http://adsabs.harvard.edu/abs/2016MNRAS.457.2871E

Abstract

We present observations of CK Vul obtained with the Spitzer Space Telescope. The infrared spectrum reveals a warm dust continuum with nebular, molecular hydrogen and HCN lines superimposed, together with the `Unidentified Infrared' features. The nebular lines are consistent with emission by a low-density gas. We conclude that the Spitzer data, combined with other information, are incompatible with CK Vul being a classical nova remnant in `hibernation' after the event of 1670, a `very late thermal pulse', a `Luminous Red Variable', such as V838 Mon, or a `diffusion-induced nova'. The true nature of CK Vul remains a mystery.