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GRB 161219B-SN 2016jca: a powerful stellar collapse | C.Ashall
; E.Pian
; P.A. Mazzali
; E.Palazzi
; S.J.Prentice
; S.Kobayashi
; A.Levan
; D.Perley
; F. Bufano
; A.V.Filippenko
; J.P.U.Fynbo
; A. Melandri
; P.DAvanzo
; M. De Pasquale
; S.Emery
; A.S. Fruchter
; K.Hurley
; D.Malesani
; P.Moller
; K.Nomoto
; M.Tanaka
; N.Tanvir
; A.F.Valeev
; | Date: |
15 Feb 2017 | Abstract: | Long duration gamma-ray bursts (GRBs) mark the birth of a compact object, a
neutron star or black hole. At low-redshift ($z<0.2$) these events are
extremely rare and most are poorly known. Four nearby GRBs have been associated
with Type Ic supernovae (SNe Ic), . GRB/SNe lack hydrogen and helium, and are
classified as SNe Ic, but have extremely broad features, which indicate the
presence of material at very high velocities ($>0.3c$). They have a kinetic
energy ($E_{k}$) of $sim10^{52}$erg, and are thought to be the explosion of
bare carbon-oxygen cores of stars with initial mass 35-50M$_odot$. Here we
report observations of the nearby GRB 161219B ($z=0.1475$) and the associated
SN 2016jca. We obtained a high-cadence time-series of spectra and photometry
starting 2 days after explosion. The GRB afterglow had a late achromatic break
12 days after outburst which indicates that the relativistic material was
ejected in an outflow with a large opening angle. We first identified the SN 5
days after the GRB.
Such an early detection gives us the opportunity to explore the outermost
layers of the ejecta.
We find the outer most ejecta are dominated by heavy elements, while lighter
elements are present in high abundance at low velocities.
Geometrically this suggests that we are viewing a high velocity nuclearly
processed outflow down its axis.
This and the wide opening angle suggests a highly magnetized millisecond
pulsar may power the explosion. | Source: | arXiv, 1702.4339 | Services: | Forum | Review | PDF | Favorites |
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