The Unusual Temporal and Spectral Evolution of SN2011ht. II. Peculiar Type IIn or Impostor?

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SN2011ht has been described both as a true supernova and as an impostor.

• In this paper, we conclude that it does not match some basic expectations for a core-collapse event.
• We discuss SN2011ht's spectral evolution from a hot dense wind to a cool dense wind, followed by the post-plateau appearance of a faster low density wind during a rapid decline in luminosity.
• We identify a slow dense wind expanding at only 500--600 km/s, present throughout the eruption.