Mon. Not. R. Astron. Soc., 497, 361-377 (2020/September-1)
The low-luminosity Type II SN 2016aqf: a well-monitored spectral evolution of the Ni/Fe abundance ratio.
MULLER-BRAVO T.E., GUTIERREZ C.P., SULLIVAN M., JERKSTRAND A., ANDERSON J.P., GONZALEZ-GAITAN S., SOLLERMAN J., ARCAVI I., BURKE J., GALBANY L., GAL-YAM A., GROMADZKI M., HIRAMATSU D., HOSSEINZADEH G., HOWELL D.A., INSERRA C., KANKARE E., KOZYREVA A., McCULLY C., NICHOLL M., SMARTT S., VALENTI S. and YOUNG D.R.
Abstract (from CDS):
Low-luminosity Type II supernovae (LL SNe II) make up the low explosion energy end of core-collapse SNe, but their study and physical understanding remain limited. We present SN 2016aqf, an LL SN II with extensive spectral and photometric coverage. We measure a V-band peak magnitude of -14.58 mag, a plateau duration of ∼100 d, and an inferred 56Ni mass of 0.008 ± 0.002 M☉. The peak bolometric luminosity, Lbol ≃ 1041.4 erg s–1, and its spectral evolution are typical of other SNe in the class. Using our late-time spectra, we measure the [O I] λλ6300, 6364 lines, which we compare against SN II spectral synthesis models to constrain the progenitor zero-age main-sequence mass. We find this to be 12 ± 3 M☉. Our extensive late-time spectral coverage of the [Fe II] λ7155 and [Ni II] λ7378 lines permits a measurement of the Ni/Fe abundance ratio, a parameter sensitive to the inner progenitor structure and explosion mechanism dynamics. We measure a constant abundance ratio evolution of 0.081+0.009–0.010 and argue that the best epochs to measure the ratio are at ∼200-300 d after explosion. We place this measurement in the context of a large sample of SNe II and compare against various physical, light-curve, and spectral parameters, in search of trends that might allow indirect ways of constraining this ratio. We do not find correlations predicted by theoretical models; however, this may be the result of the exact choice of parameters and explosion mechanism in the models, the simplicity of them, and/or primordial contamination in the measured abundance ratio.
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
techniques: photometric - spectroscopic telescopes - supernovae: individual: SN 2016aqf - transients: supernovae
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