Time-dependent non-LTE Radiative Transfer of Supernova Ejecta

Details Time-dependent non-LTE Radiative Transfer of Supernova Ejecta Time-dependent non-LTE Radiative Transfer of Supernova Ejecta

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1171..199d&link_type=abstract

RECENT DIRECTIONS IN ASTROPHYSICAL QUANTITATIVE SPECTROSCOPY AND RADIATION HYDRODYNAMICS: Proceedings of the International Confe

Astronomy and Astrophysics

Astrophysics

1

Radiative Transfer, Supernovae, Stellar Atmospheres, Radiative Transfer, Scattering, Supernovae, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation

Scientific paper

We review our recent and ongoing efforts towards time-dependent non-LTE radiative transfer simulations of supernova (SN) ejecta with the code CMFGEN. Originally, we focused on Type II-Plateau (II-P) SN ejecta, environments where line and continuum formation are quite analogous to hydrogen-rich expanding stellar atmospheres. Using non-LTE but assuming steady-state, we highlight, for example, the importance of line-blanketing and line overlap, the nonstandard P-Cygni line profile morphology, and promote the use of Type II-P SNe for distance determinations in the Universe. Relaxing the assumption of steady state in the energy and statistical-equilibrium equations, we emphasize the importance of the corresponding time-dependent terms on the ejecta ionization, line optical depths, and hence line profile morphology and strengths. Relaxing the assumption of homogeneity and of a prescribed inner boundary flux, we now include time-dependent terms for the radiation field and perform simulations of the entire SN ejecta. Combined with the non-LTE capability, and based on hydrodynamical inputs of the explosion, such time-dependent radiative transfer simulations of the full ejecta offer a very high level of physical consistency. We illustrate our discussion with preliminary results, comparing a couple of time-dependent non-LTE synthetic spectra of model lm18a7Ad (Woosley, priv. comm.) to observations of SN 1987A.

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