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  Sub-Chandrasekhar progenitors favoured for Type Ia supernovae: evidence from late-time spectroscopy

Flörs, A., Spyromilio, J., Taubenberger, S., Blondin, S., Cartier, R., Leibundgut, B., et al. (2019). Sub-Chandrasekhar progenitors favoured for Type Ia supernovae: evidence from late-time spectroscopy. Monthly Notices of the Royal Astronomical Society, 491(2), 2902-2918. doi:10.1093/mnras/stz3013.

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Flörs, A.1, Author              
Spyromilio, J., Author
Taubenberger, S.1, Author              
Blondin, S., Author
Cartier, R., Author
Leibundgut, B., Author
Dessart, L., Author
Dhawan, S., Author
Hillebrandt, W.1, Author              
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1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: A non-local-thermodynamic-equilibrium level population model of the first and second ionization stages of iron, nickel, and cobalt is used to fit a sample of XShooter optical + near-infrared (NIR) spectra of Type Ia supernovae (SNe Ia). From the ratio of the NIR lines to the optical lines limits can be placed on the temperature and density of the emission region. We find a similar evolution of these parameters across our sample. Using the evolution of the Fe ii 12 570 –7155 Å  line as a prior in fits of spectra covering only the optical wavelengths we show that the 7200 Å  feature is fully explained by [Fe ii] and [Ni ii] alone. This approach allows us to determine the abundance of Ni ii/Fe ii for a large sample of 130 optical spectra of 58 SNe Ia with uncertainties small enough to distinguish between Chandrasekhar mass (MCh) and sub- Chandrasekhar mass (sub-MCh) explosion models. We conclude that the majority (85 per cent) of normal SNe Ia have a Ni/Fe abundance that is in agreement with predictions of sub-MCh explosion simulations of ∼Z progenitors. Only a small fraction (11 per cent) of objects in the sample have a Ni/Fe abundance in agreement with MCh explosion models.

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 Dates: 2019-11-04
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz3013
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Title: Monthly Notices of the Royal Astronomical Society
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Source Genre: Journal
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Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 491 (2) Sequence Number: - Start / End Page: 2902 - 2918 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470