A Gamma-Ray Burst Model with Small Baryon Contamination

  title={A Gamma-Ray Burst Model with Small Baryon Contamination},
  author={Mario Vietri and Luigi Stella},
  journal={The Astrophysical Journal},
We present a scenario ("supranova") for the formation of gamma-ray bursts (GRBs) occurring when a supramassive neutron star (SMNS) loses so much angular momentum that centrifugal support against self-gravity becomes impossible, and the star implodes to a black hole. This may be the most baryon-clean environment proposed so far, because the SN explosion in which the SMNS forms sweeps the medium surrounding the remnant, and the quickly spinning remnant loses energy through magnetic dipole… Expand
A burst in a wind bubble and the impact on baryonic ejecta: high-energy gamma-ray flashes and afterglows from fast radio bursts and pulsar-driven supernova remnants
Tenuous wind bubbles, which are formed by the spin-down activity of central compact remnants, are relevant in some models of fast radio bursts (FRBs) and super-luminous supernovae. We study theirExpand
The Central Engine of GRB 130831A and the Energy Breakdown of a Relativistic Explosion
Gamma-ray bursts (GRBs) are the most luminous explosions in the Universe, yet the nature and physical properties of their energy sources are far from understood. Very important clues, however, can beExpand
Glimpses of a strange star
There are about 2000 gamma ray burst (GRB) events known to us with data pouring in at the rate of one per day. While the afterglows of GRBs in radio, optical and X-ray bands are successfullyExpand
Line Emission from Gamma-Ray Burst Environments
The time- and angle-dependent line and continuum emission from a dense torus around a cosmological gamma-ray burst source is simulated, taking into account photoionization, collisional ionization,Expand
Cosmic gamma-ray bursts
Abstract The properties of the cosmic Gamma-ray Bursts (GRBs) are briefly summarized. Two fundamental theoretical problems are pointed out: the problem of the energy source, and the problem ofExpand
Iron line in the afterglow: a key to unveil gamma-ray burst progenitors
The discovery of a powerful and transient iron line feature in the X-ray afterglow spectra of gamma-ray bursts would be a major breakthrough for understanding the nature of their progenitors. Piro etExpand
Gamma-Ray Bursts: Characteristics and Prospects
Gamma-ray bursts (GRBs) are the most powerful explosions in the universe. They have remained the object of intense research ever since their discovery was declassified in the early 1970s. SeveralExpand
Fast radio bursts: the last sign of supramassive neutron stars
Context. Several fast radio bursts have been discovered recently, showing a bright, highly dispersed millisecond radio pulse. The pulses do not repeat and are not associated with a known pulsar orExpand
Supernovae in helium star–compact object binaries: a possible γ-ray burst mechanism
Helium star-compact object binaries, and helium star-neutron star binaries in particular, are widely believed to be the progenitors of the observed double-neutron-star systems. In these, the secondExpand
A Possible Emission Feature in an X-Ray Afterglow of GRB 970828 as a Radiative Recombination Edge
A gamma-ray burst (GRB) of 1997 August 28 was localized by the All-Sky Monitor on the Rossi X-Ray Timing Explorer satellite, and its coordinates were promptly disseminated. An ASCA follow-up startedExpand


Yet Another Model of Gamma-Ray Bursts
Sari & Piran have demonstrated that the time structure of gamma-ray bursts (GRBs) must reflect the time structure of their energy release. A model that satisfies this condition uses theExpand
Gamma-ray bursts as the death throes of massive binary stars
We propose that gamma-ray bursts are created in the mergers of double neutron star binaries and black hole neutron star binaries at cosmological distances. Two different processes provide theExpand
Millisecond pulsars with extremely strong magnetic fields as a cosmological source of γ-ray bursts
THE spatial and luminosity distribution of γ-ray bursts as observed by the BATSE instrument on the Compton Gamma Ray Observatory1,2 provides support for the revival of the idea3,4 that the burstExpand
The Soft X-Ray Afterglow of Gamma-Ray Bursts, A Stringent Test for the Fireball Model
I consider the recent discovery of a soft X-ray source inside the error box of the gamma-ray burst GB 960720 by the SAX, ASCA, and ROSAT satellites, in terms of the fireball model. I show that theExpand
Unsteady outflow models for cosmological gamma-ray bursts
The 'event' that triggers a gamma-ray burst cannot last for more than a few seconds. This is, however, long compared with the dynamical timescale of a compact stellar-mass object (approximately 10Expand
Neutrino bursts from gamma-ray bursts
If gamma-ray bursts originate at cosmological distances, as strongly indicated by the results from Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory (CGRO), thenExpand
Do Pulsars Make Supernovae
The hypothesis, that pulsars can produce supernova explosions of type II, is explored with the aid of detailed hydrodynamical calculations. Preliminary calculations performed with Gunn (1971)Expand
Evolution of pulsar-driven supernova remnants
Radio and X-ray observations of the growing class of Crab-line supernova remnants (''plerions'') suggest that a central pulsar dominates their evolution. We model a plerion as a spherical,Expand
Gamma-ray bursts from stellar mass accretion disks around black holes
A cosmological model for gamma-ray bursts is explored in which the radiation is produced as a broadly beamed pair fireball along the rotation axis of an accreting black hole. The black hole may be aExpand
On the nature of nonthermal radiation from cosmological gamma-ray bursters
Relativistic electron-positron winds with strong magnetic fields are considered as a source of radiation for cosmological $\gamma$-ray bursters. Such a wind is generated by a millisecond pulsar withExpand