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- W3100799076 abstract "We obtained optical and near infrared spectra of Type Ia supernovae (SNe Ia) at epochs ranging from 224 to 496 days after the explosion. The spectra show emission lines from forbidden transitions of singly ionised iron and cobalt atoms. We used non-local thermodynamic equilibrium (NLTE) modelling of the first and second ionisation stages of iron, nickel, and cobalt to fit the spectra using a sampling algorithm allowing us to probe a broad parameter space. We derive velocity shifts, line widths, and abundance ratios for iron and cobalt. The measured line widths and velocity shifts of the singly ionised ions suggest a shared emitting region. Our data are fully compatible with radioactive 56 Ni decay as the origin for cobalt and iron. We compare the measured abundance ratios of iron and cobalt to theoretical predictions of various SN Ia explosion models. These models include, in addition to 56 Ni, different amounts of 57 Ni and stable 54,56 Fe. We can exclude models that produced only 54,56 Fe or only 57 Ni in addition to 56 Ni. If we consider a model that has 56 Ni, 57 Ni, and 54,56 Fe then our data imply that these ratios are 54,56 Fe / 56 Ni = 0.272 ± 0.086 and 57 Ni / 56 Ni = 0.032 ± 0.011." @default.
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- W3100799076 date "2018-12-01" @default.
- W3100799076 modified "2023-10-11" @default.
- W3100799076 title "Limits on stable iron in Type Ia supernovae from near-infrared spectroscopy" @default.
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- W3100799076 doi "https://doi.org/10.1051/0004-6361/201833512" @default.
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