Reflections on Reflexions: II. Effects of Light Echoes on the luminosity and spectra of Type Ia Supernovae

Astronomy and Astrophysics – Astrophysics

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15 pages, 14 figures, submitted to MNRAS. Full resolution version at http://www.eso.org/~fpatat/science/LE/paperII.pdf

Scientific paper

10.1111/j.1365-2966.2006.10451.x

In this paper we present and discuss the effects of scattered light echoes (LE) on the luminosity and spectral appearance of Type Ia Supernovae (SNe). After introducing the basic concepts of LE spectral synthesis, by means of LE models and real observations we investigate the deviations from pure SN spectra, light and colour curves, the signatures that witness the presence of a LE and the possible inferences on the extinction law. The effects on the photometric parameters and spectral features are also discussed. In particular, for the case of circumstellar dust, LEs are found to introduce an apparent relation between the post-maximum decline rate and the absolute luminosity which is most likely going to affect the well known Pskowski-Phillips relation.

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