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Investigating the properties of stripped-envelope supernovae, what are the implications for their progenitors? | | S. J. Prentice
; C. Ashall
; P. A. James
; L. Short
; P. A. Mazzali
; D. Bersier
; P. A. Crowther
; C. Barbarino
; T.-W. Chen
; C. M. Copperwheat
; M. J. Darnley
; L. Denneau
; N. Elias-Rosa
; M. Fraser
; L. Galbany
; A. Gal-Yam
; J. Harmanen
; D. A. Howell
; G. Hosseinzadeh
; C. Inserra
; E. Kankare
; E. Karamehmetoglu
; G. P. Lamb
; M. Limongi
; K. Maguire
; C. McCully
; F. Olivares E.
; A. S. Piascik
; G. Pignata
; D. E. Reichart
; A. Rest T. Reynolds
; Ó. Rodríguez
; J. L. O. Saario
; S. Schulze
; S. J. Smartt
; K. W. Smith
; J. Sollerman
; B. Stalder
; M. Sullivan
; F. Taddia
; S. Valenti
; S. D. Vergani
; S. C. Williams
; D. R. Young
; | | Date: |
10 Dec 2018 | | Abstract: | We present observations and analysis of 18 stripped-envelope supernovae
observed during 2013 -- 2018. This sample consists of 5 H/He-rich SNe, 6
H-poor/He-rich SNe, 3 narrow lined SNe Ic and 4 broad lined SNe Ic. The peak
luminosity and characteristic time-scales of the bolometric light curves are
calculated, and the light curves modelled to derive 56Ni and ejecta masses (MNi
and Mej). Additionally, the temperature evolution and spectral line
velocity-curves of each SN are examined. Analysis of the [O I] line in the
nebular phase of eight SNe suggests their progenitors had initial masses $<20$
Msun. The bolometric light curve properties are examined in combination with
those of other SE events from the literature. The resulting dataset gives the
Mej distribution for 80 SE-SNe, the largest such sample in the literature to
date, and shows that SNe Ib have the lowest median Mej, followed by narrow
lined SNe Ic, H/He-rich SNe, broad lined SNe Ic, and finally gamma-ray burst
SNe. SNe Ic-6/7 show the largest spread of Mej, ranging from $sim 1.2 - 11$
Msun, considerably greater than any other subtype. For all SE-SNe
$<$Mej$>=2.8pm{1.5}$ Msun which further strengthens the evidence that SE-SNe
arise from low mass progenitors which are typically $<5$ Msun at the time of
explosion, again suggesting Mzams $<25$ Msun. The low $<$Mej$>$ and lack of
clear bimodality in the distribution implies $<30$ Msun progenitors and that
envelope stripping via binary interaction is the dominant evolutionary pathway
of these SNe. | | Source: | arXiv, 1812.3716 | | Services: | Forum | Review | PDF | Favorites | |
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