0000000000681914

AUTHOR

Deepto Chakrabarty

showing 4 related works from this author

Discovery and Identification of MAXI J1621-501 as a Type I X-Ray Burster with a Super-orbital Period

2019

MAXI J1621-501 is the first Swift/XRT Deep Galactic Plane Survey transient that was followed up with a multitude of space missions (NuSTAR, Swift, Chandra, NICER, INTEGRAL, and MAXI) and ground-based observatories (Gemini, IRSF, and ATCA). The source was discovered with MAXI on 2017 October 19 as a new, unidentified transient. Further observations with NuSTAR revealed 2 Type I X-ray bursts, identifying MAXI J1621-501 as a Low Mass X-ray Binary (LMXB) with a neutron star primary. Overall, 24 Type I bursts were detected from the source during a 15 month period. At energies below 10 keV, the source spectrum was best fit with three components: an absorbed blackbody with kT = 2.3 keV, a cutoff p…

PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)010504 meteorology & atmospheric sciencesX-ray bursterX-ray transient sourceAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsGalactic planeX-ray bursterLight curveOrbital period01 natural sciencesLow-mass X-ray binary starNeutron starSettore FIS/05 - Astronomia E AstrofisicaSpace and Planetary Science0103 physical sciencesRadiative transferEmission spectrumLow MassAstrophysics - High Energy Astrophysical Phenomena010303 astronomy & astrophysics0105 earth and related environmental sciencesAstrophysical Journal
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The Large Observatory For x-ray Timing

2014

The Large Observatory For x-ray Timing (LOFT) was studied within ESA M3 Cosmic Vision framework and participated in the final down-selection for a launch slot in 2022-2024. Thanks to the unprecedented combination of effective area and spectral resolution of its main instrument, LOFT will study the behaviour of matter under extreme conditions, such as the strong gravitational field in the innermost regions of accretion flows close to black holes and neutron stars, and the supra-nuclear densities in the interior of neutron stars. The science payload is based on a Large Area Detector (LAD, 10 m 2 effective area, 2-30 keV, 240 eV spectral resolution, 1 deg collimated field of view) and a WideFi…

x-ray and γ-ray instrumentationcompact objects; microchannel plates; X-ray detectors; X-ray imaging; X-ray spectroscopy; X-ray timing; Electronic Optical and Magnetic Materials; Condensed Matter Physics; Computer Science Applications1707 Computer Vision and Pattern Recognition; Applied Mathematics; Electrical and Electronic EngineeringVisionX-ray timingObservatoriesField of view01 natural sciences7. Clean energyneutron starsObservatory010303 astronomy & astrophysicsPhysicsEquipment and servicesApplied MathematicsAstrophysics::Instrumentation and Methods for AstrophysicsSteradian[ SDU.ASTR.IM ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]Computer Science Applications1707 Computer Vision and Pattern RecognitionX-ray detectorsCondensed Matter Physicscompact objectsX-ray spectroscopyAstrophysics - Instrumentation and Methods for AstrophysicsX-ray detector[PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]Cosmic VisionSpectral resolutionmicrochannel platesAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesNOmicrochannel platecompact objects; microchannel plates; X-ray detectors; X-ray imaging; X-ray spectroscopy; X-ray timing; Electronic Optical and Magnetic Materials; Condensed Matter Physics; Applied Mathematics; Electrical and Electronic EngineeringSettore FIS/05 - Astronomia e AstrofisicaX-rayscompact object0103 physical sciencesElectronicOptical and Magnetic MaterialsElectrical and Electronic EngineeringSpectral resolutionInstrumentation and Methods for Astrophysics (astro-ph.IM)dense hadronic matterSensors010308 nuclear & particles physicsX-ray imagingAstronomyAccretion (astrophysics)[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]Neutron star13. Climate actionx-ray and γ-ray instrumentation; neutron stars; dense hadronic matter[ PHYS.ASTR.IM ] Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]Gamma-ray burstastro-ph.IM
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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
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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
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