Properties of the ultraviolet flux of type Ia supernovae: an analysis with synthetic spectra of SN 2001ep and SN 2001eh - AstrophysicsReport as inadecuate




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Abstract: The spectral properties of type Ia supernovae in the ultraviolet UV areinvestigated using the early-time spectra of SN 2001ep and SN 2001eh obtainedusing the Hubble Space Telescope HST. A series of spectral models is computedwith a Monte Carlo spectral synthesis code, and the dependence of the UV fluxon the elemental abundances and the density gradient in the outer layers of theejecta is tested. A large fraction of the UV flux is formed by reversefluorescence scattering of photons from red to blue wavelengths. This process,combined with ionization shifts due to enhanced line blocking, can lead to astronger UV flux as the iron-group abundance in the outer layers is increased,contrary to previous claims.



Author: D.N. Sauer, P.A. Mazzali, S. Blondin, M. Stehle, S. Benetti, P. Challis, A.V. Filippenko, R.P. Kirshner, W. Li, T.Matheson

Source: https://arxiv.org/







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