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Date and Time of the Query: 2019-08-21 T02:53:28 PDT
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For refcode 2000PASP..112..217B:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
2000PASP..112..217B Supernova Resonance-scattering Profiles in the Presence of External Illumination DAVID BRANCH, DAVID J. JEFFERY, MYRA BLAYLOCK, AND KAZUHITO HATANO Received 1999 September 20; accepted 1999 October 21 ABSTRACT: We discuss a simple model for the formation of a supernova spectral line by resonance scattering in the presence of external illumination of the line-forming region by light from circumstellar interaction (toplighting). The simple model provides a clear understanding of the most conspicuous toplighting effect: a rescaling or, as we prefer, a "muting" of the line profile relative to the continuum. This effect would be present in more realistic models, but would be harder to isolate. An analytic expression for a muting factor for a P Cygni line is derived that depends on the ratio E of the toplighting specific intensity to the specific intensity from the supernova photosphere. If E < 1, the line profile is reduced in scale or "muted." If E = 1, the line profile vanishes altogether. If E > 1, the line profile flips vertically: then having an absorption component near the observer-frame line-center wavelength and a blueshifted emission component.
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