Type Iax supernovae as a few-parameter family

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    • Barnabás Barna
    • Tamás Szalai
    • Wolfgang E. Kerzendorf
    • Markus Kromer
    • Stuart A. Sim
    • Mark R. Magee
    • Bruno Leibundgut

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    We present the direct spectroscopic modelling of five Type Iax supernovae (SNe) with the 1D Monte Carlo radiative transfer code TARDIS. The abundance tomography technique is used to map the chemical structure and physical properties of the SN atmospheres. By fitting multiple spectral epochs with self-consistent ejecta models, we can constrain the location of some elements within the ejecta. The synthetic spectra of the best-fitting models can reproduce the flux continuum and the main absorption features in the whole sample. We find that the mass fractions of iron-group elements and intermediate-mass elements show a decreasing trend towards the outer regions of the atmospheres when we use density profiles similar to those of deflagration models in the literature. Oxygen is the only element that could be dominant at higher velocities. The stratified abundance structure contradicts the well-mixed chemical profiles predicted by pure deflagration models. Based on the derived densities and abundances, a template model atmosphere is created for the SN Iax class and compared with the observed spectra. The free parameters are the scaling of the density profile, the velocity shift of the abundance template, and the peak luminosity. The results of this research support the idea that all SNe Iax can be described by a similar internal structure, which argues for a common origin of this class of explosions.

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    • Type Iax supernovae as a few-parameter family

      Rights statement: © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. Please refer to any applicable terms of use of the publisher.

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    DOI

    Original languageEnglish
    Pages (from-to)3609-3627
    JournalMonthly Notices of the Royal Astronomical Society
    Journal publication dateNov 2018
    Issue number3
    Volume480
    Early online date21 Aug 2018
    DOIs
    Publication statusPublished - Nov 2018

      Research areas

    • line: formation, line: identification, radiative transfer, supernovae: general

    ID: 158028805