Testing the Equation of State with Electromagnetic Observations

Degenaar, N.; Suleimanov, V.

doi:10.1007/978-3-319-97616-7_5

Cited by 25 publications

(24 citation statements)

References 376 publications

(513 reference statements)

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“…Calculations of the dimensionless amplitudes α (e) U (for mUrca process with electrons) and α (µ) U (for mUrca process with muons) are shown in Fig. 2 2 ] ≈ 1, which is the same for electron and muon processes [6]. Dashed lines show the results of the present calculations where the Gmatrix is used for the interaction, but the traditional nucleon propagator is used.…”

Section: Resultsmentioning

confidence: 72%

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In-medium enhancement of the modified Urca neutrino reaction rates

2018

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We calculate modified Urca neutrino emission rates in the dense nuclear matter in neutron star cores. We find that these rates are strongly enhanced in the beta-stable matter in regions of the core close to the direct Urca process threshold. This enhancement can be tracked to the use of the in-medium nucleon spectrum in the virtual nucleon propagator. We describe the in-medium nucleon scattering in the non-relativistic Bruckner-Hartree-Fock framework taking into account two-body as well as the effective threebody forces, although the proposed enhancement does not rely on a particular way of the nucleon interaction treatment. Finally we suggest a simple approximate expression for the emissivity of the neutron branch of the modified Urca process that can be used in the neutron stars cooling simulations with any nucleon equation of state of dense matter.

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Section: Resultsmentioning

confidence: 72%

“…One of a few insights into the uncertain physics of the NS interiors comes from the study of the thermal evolution of these objects, either isolated or in binary systems, see, e.g. [5,2]. One of the main cooling regulators, alongside with the surface electromagnetic emission, is the neutrino emission from the NS bulk.…”

Section: Introductionmentioning

confidence: 99%

In-medium enhancement of the modified Urca neutrino reaction rates

2018

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“…Estimates of the tidal properties of the binary neutron star (BNS) source of GW170817 [5,6] are inconsistent with too stiff hadronic matter, and lead to NS radii that are consistent with previous X-ray binary observations [7][8][9][10]. With further future BNS detections and improved detector sensitivity [11], GW observations will yield stringent constraints on the NS interior properties [12][13][14][15][16][17][18] that are expected to encounter smaller systematic uncertainties than those from X-ray binaries [19].…”

Section: Introductionmentioning

confidence: 83%

Studying strong phase transitions in neutron stars with gravitational waves

2020

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The composition of neutron stars at the extreme densities reached in their cores is currently unknown. Besides nuclear matter of normal neutrons and protons, the cores of neutron stars might harbor exotic matter such as deconfined quarks. In this paper we study strong hadron-quark phase transitions in the context of gravitational wave observations of inspiraling neutron stars. We consider upcoming detections of neutron star coalescences and model the neutron star equations of state with phase transitions through the Constant-Speed-of-Sound parametrization. We use the fact that neutron star binaries with one or more hadron-quark hybrid stars can exhibit qualitatively different tidal properties than binaries with hadronic stars of the same mass, and hierarchically model the masses and tidal properties of simulated populations of binary neutron star inspiral signals. We explore the parameter space of phase transitions and discuss under which conditions future observations of binary neutron star inspirals can identify this effect and constrain its properties, in particular the threshold density at which the transition happens and the strength of the transition. We find that if the detected population of binary neutron stars contains both hadronic and hybrid stars, the onset mass and strength of a sufficiently strong phase transition can be constrained with 50-100 detections. If the detected neutron stars are exclusively hadronic or hybrid, then it is possible to place lower or upper limits on the transition density and strength.

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“…Lattimer & Prakash 2016) and confirmed by both electromagnetic (e.g. Degenaar & Suleimanov 2018) and gravitational-wave (e.g. Abbott et al 2018) observations, these models can be rejected.…”

Section: Spectra Of J0633 and Its Pwnmentioning

confidence: 92%

XMM–Newton observations of a gamma-ray pulsar J0633+0632: pulsations, cooling and large-scale emission

Danilenko

Карпова

Ofengeim

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We report results of XMM-Newton observations of a γ-ray pulsar J0633+0632 and its wind nebula. We reveal, for the first time, pulsations of the pulsar X-ray emission with a single sinusoidal pulse-profile and a pulsed fraction of 23 ± 6 per cent in the 0.3-2 keV band. We confirm previous Chandra findings that the pulsar X-ray spectrum consists of thermal and non-thermal components. However, we do not find the absorption feature that was previously detected at about 0.8 keV. Thanks to the greater sensitivity of XMM-Newton, we get stronger constraints on spectral model parameters compared to previous studies. The thermal component can be equally well described by either blackbody or neutron star atmosphere models, implying that this emission is coming from either hot pulsar polar caps with a temperature of about 120 eV or from the colder bulk of the neutron star surface with a temperature of about 50 eV. In the latter case, the pulsar appears to be one of the coolest among other neutron stars of similar ages with estimated surface temperatures. We discuss cooling scenarios relevant to this neutron star. Using an interstellar absorption-distance relation, we also constrain the distance to the pulsar to the range of 0.7-2 kpc. Besides the pulsar and its compact nebula, we detect regions of weak large-scale diffuse non-thermal emission in the pulsar field and discuss their possible nature.

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Testing the Equation of State with Electromagnetic Observations

Cited by 25 publications

References 376 publications

In-medium enhancement of the modified Urca neutrino reaction rates

In-medium enhancement of the modified Urca neutrino reaction rates

Studying strong phase transitions in neutron stars with gravitational waves

XMM–Newton observations of a gamma-ray pulsar J0633+0632: pulsations, cooling and large-scale emission

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