Zobrazeno 1 - 10
of 72
pro vyhledávání: '"Daigne, Frederic"'
Autor:
Daigne, Frédéric, Bošnjak, Željka
Synchrotron radiation from accelerated electrons above the photosphere of a relativistic ejecta is a natural candidate for the dominant process for the prompt GRB emission. There is however a tension between the predicted low-energy spectral index $\
Externí odkaz:
http://arxiv.org/abs/2407.04023
Autor:
Pellouin, Clément, Daigne, Frédéric
Publikováno v:
A&A 690, A281 (2024)
We present a complete numerical model of the afterglow of a laterally structured relativistic ejecta from the radio to very high energies (VHE). This includes a self-consistent calculation of the synchrotron radiation, with its maximum frequency, and
Externí odkaz:
http://arxiv.org/abs/2406.08254
Publikováno v:
A&A, 683 (2024) A30
The early steep decay, a rapid decrease in X-ray flux as a function of time following the prompt emission, is a robust feature seen in almost all gamma-ray bursts with early enough X-ray observations. This peculiar phenomenon has often been explained
Externí odkaz:
http://arxiv.org/abs/2310.15660
Publikováno v:
Mon. Not. Roy. Astron. Soc. stad2594 (2023)
GRB030329 displays one clear and, possibly, multiple less intense fast-rising ($\Delta t / t \sim 0.3$) jumps in its optical afterglow light curve. The decay rate of the optical light curve remains the same before and after the photon flux jumps. Thi
Externí odkaz:
http://arxiv.org/abs/2306.00815
We develop a model to explain the flaring activity in gamma-ray burst X-ray afterglows within the framework of slightly misaligned observers to structured jets. We suggest that flares could be the manifestation of prompt dissipation within the core o
Externí odkaz:
http://arxiv.org/abs/2112.02917
Publikováno v:
A&A 651, A83 (2021)
The binary neutron star merger gravitational-wave signal GW170817 was followed by three electromagnetic counterparts, including a kilonova arising from the radioactivity of freshly synthesized $r$-process elements in ejecta from the merger. Finding k
Externí odkaz:
http://arxiv.org/abs/2103.00943
Autor:
Palmerio, Jesse T., Daigne, Frédéric
Publikováno v:
A&A 649, A166 (2021)
Long Gamma-Ray Bursts (LGRBs) have been shown to be powerful probes of the Universe, in particular to study the star formation rate up to very high redshift ($z \sim 9$). Since LGRBs are produced by only a small fraction of massive stars, it is param
Externí odkaz:
http://arxiv.org/abs/2011.14745
We study the enrichment of the interstellar medium with rapid neutron capture (r-process) elements produced in binary neutron star (BNS) mergers. We use a semi-analytic model to describe galactic evolution, with merger rates and time delay distributi
Externí odkaz:
http://arxiv.org/abs/2010.00625
Late activity of the central engine is often invoked in order to explain the flares observed in the early X-ray afterglow of gamma-ray bursts, either in the form of an active neutron star remnant or (fall-back) accretion onto a black hole. However, t
Externí odkaz:
http://arxiv.org/abs/2004.04179
Publikováno v:
A&A 639, A15 (2020)
The only binary neutron star merger gravitational wave event with detected electromagnetic counterparts recorded to date is GRB170817A. This merger occurred in a rarefied medium with a density smaller than $10^{-3}-10^{-2}~{\rm cm}^{-3}$. Since kicks
Externí odkaz:
http://arxiv.org/abs/1911.03302