Spectral modeling of type II supernovae. I. Dilution factors

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    • C. Vogl
    • S. A. Sim
    • U. M. Noebauer
    • W. E. Kerzendorf
    • W. Hillebrandt

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    We present substantial extensions to the Monte Carlo radiative transfer code TARDIS to perform spectral synthesis for type II supernovae. By incorporating a non-LTE ionization and excitation treatment for hydrogen, a full account of free–free and bound-free processes, a self-consistent determination of the thermal state and by improving the handling of relativistic effects, the improved code version includes the necessary physics to perform spectral synthesis for type II supernovae to high precision as required for the reliable inference of supernova properties. We demonstrate the capabilities of the extended version of TARDIS by calculating synthetic spectra for the prototypical type II supernova SN1999em and by deriving a new and independent set of dilution factors for the expanding photosphere method. We have investigated in detail the dependence of the dilution factors on photospheric properties and, for the first time, on changes in metallicity. We also compare our results with the previously published sets of dilution factors and discuss the potential sources of the discrepancies between studies.

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    Original languageEnglish
    Article numberA29
    Number of pages15
    JournalAstronomy & Astrophysics
    Journal publication date03 Jan 2019
    Volume621
    DOIs
    Publication statusPublished - 03 Jan 2019

      Research areas

    • radiative transfer, methods: numerical, stars: distances, supernovae: general, supernovae: individual: SN1999em

    ID: 163740042