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Using late-time optical and near-infrared spectra to constrain Type Ia supernova explosion properties

Maguire, K ; Sim, S A ; Shingles, L ; Spyromilio, J ; Jerkstrand, A ; Sullivan, M ; Chen, T-W ; Cartier, R ; Dimitriadis, G ; Frohmaier, C ; Galbany, L ; Gutiérrez, C P ; Hosseinzadeh, G ; Howell, D A ; Inserra, C ; Rudy, R ; Sollerman, J

Monthly notices of the Royal Astronomical Society, 2018-07, Vol.477 (3), p.3567-3582 [Periódico revisado por pares]

Oxford University Press

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  • Título:
    Using late-time optical and near-infrared spectra to constrain Type Ia supernova explosion properties
  • Autor: Maguire, K ; Sim, S A ; Shingles, L ; Spyromilio, J ; Jerkstrand, A ; Sullivan, M ; Chen, T-W ; Cartier, R ; Dimitriadis, G ; Frohmaier, C ; Galbany, L ; Gutiérrez, C P ; Hosseinzadeh, G ; Howell, D A ; Inserra, C ; Rudy, R ; Sollerman, J
  • Assuntos: line: profiles ; supernovae: general ; techniques: spectroscopic
  • É parte de: Monthly notices of the Royal Astronomical Society, 2018-07, Vol.477 (3), p.3567-3582
  • Descrição: Abstract The late-time spectra of Type Ia supernovae (SNe Ia) are powerful probes of the underlying physics of their explosions. We investigate the late-time optical and near-infrared spectra of seven SNe Ia obtained at the VLT with XShooter at >200 d after explosion. At these epochs, the inner Fe-rich ejecta can be studied. We use a line-fitting analysis to determine the relative line fluxes, velocity shifts, and line widths of prominent features contributing to the spectra ([Fe ii], [Ni ii], and [Co iii]). By focusing on [Fe ii] and [Ni ii] emission lines in the ∼7000–7500 Å region of the spectrum, we find that the ratio of stable [Ni ii] to mainly radioactively produced [Fe ii] for most SNe Ia in the sample is consistent with Chandrasekhar-mass delayed-detonation explosion models, as well as sub-Chandrasekhar mass explosions that have metallicity values above solar. The mean measured Ni/Fe abundance of our sample is consistent with the solar value. The more highly ionized [Co iii] emission lines are found to be more centrally located in the ejecta and have broader lines than the [Fe ii] and [Ni ii] features. Our analysis also strengthens previous results that SNe Ia with higher Si ii velocities at maximum light preferentially display blueshifted [Fe ii] 7155 Å lines at late times. Our combined results lead us to speculate that the majority of normal SN Ia explosions produce ejecta distributions that deviate significantly from spherical symmetry.
  • Editor: Oxford University Press
  • Idioma: Inglês
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