TY - JOUR
T1 - The low-luminosity type II SN 2016aqf
T2 - A well-monitored spectral evolution of the Ni/Fe abundance ratio
AU - Müller-Bravo, Tomás E.
AU - Gutiérrez, Claudia P.
AU - Sullivan, Mark
AU - Jerkstrand, Anders
AU - Anderson, Joseph P.
AU - González-Gaitán, Santiago
AU - Sollerman, Jesper
AU - Arcavi, Iair
AU - Burke, Jamison
AU - Galbany, Lluís
AU - Gal-Yam, Avishay
AU - Gromadzki, Mariusz
AU - Hiramatsu, Daichi
AU - Hosseinzadeh, Griffin
AU - Andrew Howell, D.
AU - Inserra, Cosimo
AU - Kankare, Erki
AU - Kozyreva, Alexandra
AU - McCully, Curtis
AU - Nicholl, Matt
AU - Smartt, Stephen
AU - Valenti, Stefano
AU - Young, Dave R.
N1 - Publisher Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
PY - 2020/9/1
Y1 - 2020/9/1
N2 - 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+−00009010 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.
AB - 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+−00009010 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.
KW - Spectroscopic telescopes
KW - Supernovae: individual: SN 2016aqf
KW - Techniques: photometric
KW - Transients: supernovae
UR - http://www.scopus.com/inward/record.url?scp=85097391106&partnerID=8YFLogxK
U2 - 10.1093/mnras/staa1932
DO - 10.1093/mnras/staa1932
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AN - SCOPUS:85097391106
SN - 0035-8711
VL - 497
SP - 361
EP - 377
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -