Radio emission from the unusual supernova 1998bw and its association with the γ-ray burst of 25 April 1998

Kulkarni, S. R.; Frail, D. A.; Wieringa, M.; Ekers, R. D.; Sadler, E. M.; Wark, R. M.; Higdon, James L.; Phinney, E. S.; Bloom, J.

doi:10.1038/27139

Cited by 617 publications

(750 citation statements)

References 33 publications

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“…SN 1998bw [1,2], coincident in space and time with GRB 980425, remains the prototype radio-bright, broad-lined (BL) type Ic supernova, against which other supernovagamma-ray bursts are measured up. GRB 980425, however, was peculiar, with an isotropic equivalent energy release in gamma rays of only E γ ,iso ∼ 10 48 erg.…”

Section: Introductionmentioning

confidence: 99%

The supernova–gamma-ray burst–jet connection

Hjorth

2013

Phil. Trans. R. Soc. A.

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The observed association between supernovae and gamma-ray bursts represents a cornerstone in our understanding of the nature of gamma-ray bursts. The collapsar model provides a theoretical framework for this connection. A key element is the launch of a bipolar jet (seen as a gamma-ray burst). The resulting hot cocoon disrupts the star, whereas the 56 Ni produced gives rise to radioactive heating of the ejecta, seen as a supernova. In this discussion paper, I summarize the observational status of the supernova–gamma-ray burst connection in the context of the ‘engine’ picture of jet-driven supernovae and highlight SN 2012bz/GRB 120422A—with its luminous supernova but intermediate high-energy luminosity—as a possible transition object between low-luminosity and jet gamma-ray bursts. The jet channel for supernova explosions may provide new insights into supernova explosions in general.

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Section: Introductionmentioning

confidence: 99%

The supernova–gamma-ray burst–jet connection

Hjorth

2013

Phil. Trans. R. Soc. A.

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“…Provided the baryon load of the fireball is not too large, the baryons are accelerated together with the e + e − pairs to ultra-relativistic speeds (Lorentz factors > 10 2 ; [3]). The existence of such relativistic flows is supported by radio observations of GRB 980425 [8].The dynamics of spherically symmetric relativistic fireballs has been studied by several authors by means of 1D Lagrangian hydrodynamic simulations (e.g., [12]). It has been argued that the rapid temporal decay of several GRB afterglows is more consistent with the evolution of a relativistic jet after it slows down and spreads laterally than with a spherical blast wave [9].…”

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confidence: 89%

Relativistic Jets from Collapsars

Aloy¹,

Müeller²,

Ibanyez³

et al. 2001

Godunov Methods

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We have studied the relativistic beamed outflow proposed to occur in the collapsar model of gamma-ray bursts. A jet forms as a consequence of an assumed energy deposition of ∼ 10 50 − 10 51 erg/s within a 30 • cone around the rotation axis of the progenitor star. The generated jet flow is strongly beamed ( < ∼ few degrees) and reaches the surface of the stellar progenitor (r ≈ 3 10 10 cm) intact. At break-out the maximum Lorentz factor of the jet flow is about 33. Simulations have been performed with the GENESIS multi-dimensional relativistic hydrodynamic code. Motivation and numerical setupVarious catastrophic collapse events have been proposed to explain the energies released in a gamma-ray burst (GRB) including compact binary system mergers [6,13], collapsars [18] and hypernovae [14]. These models all rely on a common engine, namely a stellar mass black hole (BH) which accretes several solar masses of matter from a disk (formed during a merger or by a non-spherical collapse). A fraction of the gravitational binding energy released by accretion is converted into a pair fireball. Provided the baryon load of the fireball is not too large, the baryons are accelerated together with the e + e − pairs to ultra-relativistic speeds (Lorentz factors > 10 2 ; [3]). The existence of such relativistic flows is supported by radio observations of GRB 980425 [8].The dynamics of spherically symmetric relativistic fireballs has been studied by several authors by means of 1D Lagrangian hydrodynamic simulations (e.g., [12]). It has been argued that the rapid temporal decay of several GRB afterglows is more consistent with the evolution of a relativistic jet after it slows down and spreads laterally than with a spherical blast wave [9]. The lack of a significant radio afterglow in GRB 990123 provides independent evidence for jet-like geometry [10]. Motivated by these observations and by the collapsar model of [11], we have simulated the propagation of jets from collapsars using relativistic hydrodynamics.In [11] the continued evolution of rotating helium stars, whose iron core collapse does not produce a successful outgoing shock but instead forms a BH surrounded 1

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“…Kulkarni et al 1998;Nakar & Sari 2012), and the jet, if present, does not emerge from the stellar surface, or is relatively weak compared to the more isotropic supernova shock breakout. Note that probably the majority of GRBs are of the low-luminosity variety, and only a minority of GRBs are 'normal', but the latter are far more easily detected (Liang et al 2007).…”

Section: Introductionmentioning

confidence: 99%

VLBI Constraints on Type I b/c Supernovae

Bietenholz

2014

Publ. Astron. Soc. Aust.

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Very long baseline interferometry observations of supernovae and gamma-ray bursts provide almost the only way of obtaining spatially resolved information about the sources. In particular, a determination of the expansion velocity of the forward shock, as well as the geometry of the fireball and its evolution with time are possible for relatively nearby events, provided they are radio bright. Monitoring the expansion of the shock front can provide information on the density profiles of both the circumstellar material and on the ejecta. Very long baseline interferometry observations can also potentially resolve gamma-ray burst jets which are not directed along the line of sight, providing crucial confirmation of relativistic expansion in such objects. This review gives an overview of recent results from supernovae, including the Type I b/c SNe 2011dh, 2009bb, and 2007gr, and discusses the prospects for future observations.

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Radio emission from the unusual supernova 1998bw and its association with the γ-ray burst of 25 April 1998

Cited by 617 publications

References 33 publications

The supernova–gamma-ray burst–jet connection

The supernova–gamma-ray burst–jet connection

Relativistic Jets from Collapsars

VLBI Constraints on Type I b/c Supernovae

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