4,084 research outputs found
Neutrinos from Fallback onto Newly Formed Neutron Stars
In the standard supernova picture, type Ib/c and type II supernovae are
powered by the potential energy released in the collapse of the core of a
massive star. In studying supernovae, we primarily focus on the ejecta that
makes it beyond the potential well of the collapsed core. But, as we shall show
in this paper, in most supernova explosions, a tenth of a solar mass or more of
the ejecta is decelerated enough that it does not escape the potential well of
that compact object. This material falls back onto the proto-neutron star
within the first 10-15 seconds after the launch of the explosion, releasing
more than 1e52erg of additional potential energy. Most of this energy is
emitted in the form of neutrinos and we must understand this fallback neutrino
emission if we are to use neutrino observations to study the behavior of matter
at high densities. Here we present both a 1-dimensional study of fallback using
energy-injected, supernova explosions and a first study of neutrino emission
from fallback using a suite of 2-dimensional simulations.Comment: 30 pages (including 10 figures), submitted to ApJ, comments welcom
Explosive Nucleosynthesis from GRB and Hypernova Progenitors: Direct Collapse versus Fallback
The collapsar engine behind long-duration gamma-ray bursts extracts the
energy released from the rapid accretion of a collapsing star onto a
stellar-massed black hole. In a collapsing star, this black hole can form in
two ways: the direct collapse of the stellar core into a black hole and the
delayed collapse of a black hole caused by fallback in a weak supernova
explosion. In the case of a delayed-collapse black hole, the strong
collapsar-driven explosion overtakes the weak supernova explosion before shock
breakout, and it is very difficult to distinguish this black hole formation
scenario from the direct collapse scenario. However, the delayed-collapse
mechanism, with its double explosion, produces explosive nucleosynthetic yields
that are very different from the direct collapse scenario. We present
1-dimensional studies of the nucleosynthetic yields from both black hole
formation scenarios, deriving differences and trends in their nucleosynthetic
yields.Comment: 47 pages, submitted to Ap
Light Curve Calculations of Supernovae from Fallback Gamma-Ray Bursts
The currently-favored model for long-duration gamma-ray bursts (GRBs) invokes
explosions from the collapse of a massive star down to a black hole: either
directly or through fallback. Those GRBs forming via fallback will produce much
less radioactive nickel, and hence it has been argued (without any real
calculation) that these systems produce dim supernovae. These fallback
black-hole GRBs have been recently been argued as possible progenitors of a
newly discovered set of GRBs lacking any associated supernovae. Here we present
the first ever radiation-hydrodynamics calculations of the light-curves
produced in the hypernova explosion by a delayed-fallback gamma-ray burst. We
find that the bolometric light-curve is dominated by shock-deposited energy,
not the decay of radioactive elements. As such, observations of such bursts
actually probe the density in the progenitor wind more than it does the
production of radioactive nickel.Comment: 11 pages (including 3 figures), submitted to ApJ, comments welcom
Staging the Audio Describer: An Exploration of Integrated Audio Description
This article explores the phenomenon of integrated audio description (AD) and the ways in which access provision for blind people can be embedded into the creative process. Exploring a practical example where a describer became a character within a production staged by a company of blind and partially blind actors, it compares an approach to AD that is open and collaborative with traditional closed approaches, where the AD is delivered by an external interpreter. The consequences for the authenticity of the access and the language of the AD are also discussed in order to explore how tense, timing and flexibility distinguish AD from stage directions
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