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SN 2016coi/ASASSN-16fp: An example of residual helium in a type Ic supernova? | S. J. Prentice
; C. Ashall
; P. A. Mazzali
; J.-J. Zhang
; P. A. James
; X.-F. Wang
; J. Vinko
; S. Percival
; L. Short
; A. Piascik
; F. Huang
; J. Mo
; L.-M. Rui
; J.-G. Wang
; D.-F. Xiang
; Y.-X. Xin
; W.-M. Yi
; X.-G. Yu
; Q. Zhai
; T.-M. Zhang
; G. Hosseinzadeh
; D. A. Howell
; C. McCully
; S. Valenti
; B. Cseh
; O. Hanyecz
; L. Kriskovics
; A. Pal
; K. Sarneczky
; A. Sodor
; R. Szakats
; P. Szekely
; E. Varga-Verebelyi
; K. Vida
; M. Bradac
; D. E. Reichart
; D. Sand
; L. Tartaglia
; | Date: |
11 Sep 2017 | Abstract: | The optical observations of Ic-4 supernova (SN) 2016coi/ASASSN-16fp, from
$sim 2$ to $sim450$ days after explosion, are presented along with analysis
of its physical properties. The SN shows the broad lines associated with SNe
Ic-3/4 but with a key difference. The early spectra display a strong absorption
feature at $sim 5400$ AA which is not seen in other SNe~Ic-3/4 at this
epoch. This feature has been attributed to He I in the literature. Spectral
modelling of the SN in the early photospheric phase suggests the presence of
residual He in a C/O dominated shell. However, the behaviour of the He I lines
are unusual when compared with He-rich SNe, showing relatively low velocities
and weakening rather than strengthening over time. The SN is found to rise to
peak $sim 16$ d after core-collapse reaching a bolometric luminosity of Lp
$sim 3 imes10^{42}$ ergs. Spectral models, including the nebular epoch, show
that the SN ejected $2.5-4$ msun of material, with $sim 1.5$ msun below
5000 kms, and with a kinetic energy of $(4.5-7) imes10^{51}$ erg. The
explosion synthesised $sim 0.14$ msun of 56Ni. There are significant
uncertainties in E(B-V)host and the distance however, which will affect Lp and
MNi. SN 2016coi exploded in a host similar to the Large Magellanic Cloud (LMC)
and away from star-forming regions. The properties of the SN and the
host-galaxy suggest that the progenitor had $M_mathrm{ZAMS}$ of $23-28$ msun
and was stripped almost entirely down to its C/O core at explosion. | Source: | arXiv, 1709.3593 | Services: | Forum | Review | PDF | Favorites |
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