0000000000848782

AUTHOR

Sebastien Guillot

showing 3 related works from this author

NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar

2018

We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M, obtained assuming a neutron star mass of 1.4[subscript ⊙] and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuS…

AccretionAstrophysics::High Energy Astrophysical Phenomenageneral [Pulsars]FOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesSpectral linelaw.inventionTelescopeX-rays: binariesSettore FIS/05 - Astronomia E AstrofisicaPulsarlow-mass [Stars]lawstars: low-mass0103 physical sciencesStars: low-maAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Neutron Star Interior Composition Explorer010308 nuclear & particles physicsComputer Science::Information Retrievalaccretion disksneutron [Stars]Astronomy and AstrophysicsAstronomy and AstrophysicOrbital periodLight curveX-rays: binarieStars: neutronNeutron starPulsars: generalAccretion diskSpace and Planetary ScienceAccretion disksbinaries [X-rays]Astrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical Phenomena[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]X-ray pulsar
researchProduct

Tracking the evolution of the accretion flow in MAXI J1820+070 during its hard state with the JED-SAD model

2021

X-ray binaries in outburst typically show two canonical X-ray spectral states, i.e. hard and soft states, in which the physical properties of the accretion flow and of the jet are known to change. Recently, the JED-SAD paradigm has been proposed for black hole X-ray binaries, aimed to address the accretion-ejection interplay in these systems. According to this model, the accretion flow is composed by an outer standard Shakura-Sunyaev disk (SAD) and an inner hot Jet Emitting Disk (JED). The JED produces both the hard X-ray emission, effectively playing the role of the hot corona, and the radio jets. In this paper, we use the JED-SAD model to describe the evolution of the accretion flow in th…

X-rays: AccretionAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics01 natural sciencesX-rays: Accretion disksSpectral lineX-rays: binariesSettore FIS/05 - Astronomia E Astrofisicaaccretion0103 physical sciencesThick disk010303 astronomy & astrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)PhysicsJet (fluid)Accretion (meteorology)010308 nuclear & particles physicsaccretion disksAstronomy and AstrophysicsRadiusX-rays: individuals: MAXI J1820+070CoronaBlack holeISM: jets and outflowsSpace and Planetary ScienceReflection (physics)Astrophysics - High Energy Astrophysical Phenomena[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Astronomy & Astrophysics
researchProduct

Dense matter with eXTP

2019

In this White Paper we present the potential of the Enhanced X-ray Timing and Polarimetry (eXTP) mission for determining the nature of dense matter; neutron star cores host an extreme density regime which cannot be replicated in a terrestrial laboratory. The tightest statistical constraints on the dense matter equation of state will come from pulse profile modelling of accretion-powered pulsars, burst oscillation sources, and rotation-powered pulsars. Additional constraints will derive from spin measurements, burst spectra, and properties of the accretion flows in the vicinity of the neutron star. Under development by an international Consortium led by the Institute of High Energy Physics o…

GAMMA-RAY PULSARSdense matterAstrophysics::High Energy Astrophysical PhenomenaPolarimetryGeneral Physics and AstronomyFOS: Physical sciencesAstrophysicsNeutronBRIGHTNESS OSCILLATIONS7. Clean energy01 natural sciencesINNER ACCRETION DISKSSpectral lineX-raydense matter; equation of state; neutron; X-rays; Physics and Astronomy (all)Physics and Astronomy (all)Equacions d'estatneutronPulsar0103 physical sciencesMILLISECOND PULSARSX-raysNEUTRON-STARRADIUS CONSTRAINTS010306 general physics010303 astronomy & astrophysicsRELATIVISTIC IRON LINEequation of statePhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)LIGHT CURVESNeutronsEquation of stateQUASI-PERIODIC OSCILLATIONSX-RaysStarke Wechselwirkung und exotische Kerne – Abteilung BlaumAstrophysics::Instrumentation and Methods for AstrophysicsEQUATION-OF-STATEAccretion (astrophysics)Neutron star:Física::Astronomia i astrofísica [Àrees temàtiques de la UPC]Raigs XAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaDense matterDense matter
researchProduct