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The electron-capture origin of supernova 2018zd | | Daichi Hiramatsu
; D. Andrew Howell
; Schuyler D. Van Dyk
; Jared A. Goldberg
; Keiichi Maeda
; Takashi J. Moriya
; Nozomu Tominaga
; Ken'ichi Nomoto
; Griffin Hosseinzadeh
; Iair Arcavi
; Curtis McCully
; Jamison Burke
; K. Azalee Bostroem
; Stefano Valenti
; Yize Dong
; Peter J. Brown
; Jennifer E. Andrews
; Christopher Bilinski
; G. Grant Williams
; Paul S. Smith
; Nathan Smith
; David J. Sand
; Gagandeep S. Anand
; Chengyuan Xu
; Alexei V. Filippenko
; Melina C. Bersten
; Gastón Folatelli
; Patrick L. Kelly
; Toshihide Noguchi
; Koichi Itagaki
; | | Date: |
4 Nov 2020 | | Abstract: | There are two well-understood regimes of stellar death, although the
transition has remained unresolved for 40 years. Stars up to about 8 solar
masses lose their outer layers and leave behind a degenerate core -- a white
dwarf. More massive stars (above $sim$ 10 solar masses) produce an iron core,
which collapse to a neutron star or black hole in a core-collapse supernova.
Theoretically, stars in between ($sim$ 8--10 solar masses) are expected to
produce an electron-capture supernova when the degenerate O+Ne+Mg core of a
super-asymptotic giant branch star collapses as a result of electron capture
onto Ne and Mg nuclei. However, until now no supernovae have unequivocally been
identified from an electron-capture origin, partly because of uncertainty in
theoretical predictions. Here we present six indicators of electron-capture
supernovae: progenitor identification, circumstellar material, chemical
composition, explosion energy, light curve, and nucleosynthesis. SN 2018zd is
the only supernova having strong evidence for or consistent with all six. These
new data cast the decades-long debate about SN 1054 in a new light, which has
some of these characteristics, but suffers from thousand year old observations
and the difficulty of making inferences from evolved supernova remnants. | | Source: | arXiv, 2011.02176 | | Services: | Forum | Review | PDF | Favorites | |
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