Astrophysique à Haute Energie

Magnetar birth as engine of extreme stellar explosions

The birth of a neutron star with an extremely strong magnetic field, called a magnetar, has emerged as a promising scenario to power a variety of outstanding explosive events. This includes gamma-ray bursts, supernovae with extreme kinetic energies called hypernovae and super-luminous supernovae. The origin of these extreme magnetic fields (of the order of 10^15 Gauss) remains, however, obscure and requires an amplification over several orders of magnitude during the formation of the neutron star.

The many faces of pulsars 

Pulsars are rapidly rotating, strongly magnetised neutron stars, 
emitting flashes of non-thermal radiation covering up to eighteen decades of 
energy in the electromagnetic spectrum.
They are powerful tools used in physics, astronomy and even cosmology.
I’ll review their observational status and prospects for the future.
I’ll then present current models of high-energy processes as well as new
theoretical developments in modeling pulsars and their wind zones.

The supernova remnant pevatron population in the TeV sky

The supernova remnant hypothesis for the origin of Galactic cosmic rays has
passed several tests, but the firm identification of a supernova remnant
pevatron, considered to be a decisive step to prove the hypothesis, is still
missing.
While a lot of hope has been placed in next-generation instruments
operating in the multi-TeV range, it is possible that current gamma-ray
instruments, operating in the TeV range, could pinpoint these objects or, most
likely, identify a number of promising targets for instruments of next

The Extreme Physics of Neutron Stars — An observer’s view point

Neutron stars are fantastic cosmic laboratories to study the most extreme physics. Their intense gravitational fields can provide tests of general relativity and other theories of gravitation. Their unmatched magnetic fields permit studies of the interaction between matter and these fields. And their extreme interior densities allow us to probe matter in regimes not accessible to Earth laboratories.  
 

O2 multi-messenger campaign and future prospects with the SVOM mission

The O2 follow-up campaign of gravitational wave candidate (GW) events was intensive with the collaboration of 95 groups in astronomy and astro-particle physics.  Since the size of the localization error of GW is quite large, the follow-up strategy for finding counterpart of GW alerts is quite complex. However, the joint accomplishment was rewarded with the first multi-messenger probe of the merger of a binary neutron stars (GW170817), an associated electromagnetic counterpart as gamma-ray burst (GRB170817A) and bright multiwavelength isotropic emission.

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