Dust around Type Ia supernovae

Details Dust around Type Ia supernovae Dust around Type Ia supernovae

2005-10-31

arxiv.org/abs/astro-ph/0511003v1

Astrophys.J.635:L33-L36,2005

Astronomy and Astrophysics

Astrophysics

ApJL, in press

Scientific paper

10.1086/499053

An explanation is given of the low value of $R_\lambda \equiv A_\lambda/E(B-V) $, the ratio of absolute to selective extinction deduced from Type Ia supernova observations. The idea involves scattering by dust clouds located in the circumstellar environment, or at the highest velocity shells of the supernova ejecta. The scattered light tends to reduce the effective $R_\lambda$ in the optical, but has an opposite effect in the ultraviolet. The presence of circumstellar dust can be tested by ultraviolet to near infrared observations and by multi-epoch spectropolarimetry of SNe Ia.

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