Swift UVOT Spectra of SN2012AWΒΆ

Swift followed the development of the SN2012aw spectra. The spectra show the increasing absorption due to metals in the UV over time.

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The Swift UVOT spectra

There are two processes that affect the spectra: effective temperature of the photosphere and ionisation/excitation processes. Dividing out the continuum emission of the blackbody radiation of the photosphere clarifies the development of absorption of the radiation field over time.

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Swift UVOT spectra normalised by the continuum of the Blackbody photospheric emission.

More details and analysis are being published: