Neutron stars in accreting systems -- signatures of the QCD phase transition

Abstract

Neutron stars (NS) that are born in binary systems with a main-sequence star companion can experience mass transfer, resulting in the accumulation of material at the surface of the NS. This, in turn, leads to the continuous growth of the NS mass and the associated steepening of the gravitational potential. Supposing the central density surpasses the onset for the phase transition from nuclear, generally hadronic matter to deconfined quark-gluon plasma, which is a quantity currently constrained solely from an upper limit by asymptotic freedom in quantum chromodynamics (QCD), the system may experience a dynamic response due to the appearance of additional degrees of freedom in the equation of state (EOS). This dynamical response might give rise to a rapid softening of the EOS during the transition in the hadron-quark matter co-existence region. While this phenomenon has long been studied in the context of hydrostatic configurations, the dynamical implications of this problem are still incompletely understood. It is the purpose of the present paper to simulate the dynamics of NSs with previously accreted envelopes caused by the presence of a first-order QCD phase transition. Therefore, we employed the neutrino radiation hydrodynamics treatment based on the fully general relativistic approach in spherical symmetry, implementing a three-flavor Boltzmann neutrino transport and a microscopic model EOS that contains a first-order hadron-quark phase transition. The associated neutrino signal shows a sudden rise in the neutrino fluxes and average energies, becoming observable for the present generation of neutrino detectors for a galactic event, and a gravitational wave mode analysis revealed the behaviors of the dominant $f$ mode and the first and the second gravity $g$ modes that are excited during the NS evolution across the QCD phase transition.

16 pages, 14 figures,to be published in A&A Journal

References in corpus (32)

• A Massive Pulsar in a Compact Relativistic Binary
• Binary interaction dominates the evolution of massive stars
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
• Refined Mass and Geometric Measurements of the High-Mass PSR J0740+6620
• Models of Pulsar Glitches
• Signals of the QCD phase transition in core-collapse supernovae
• Modelling magnetically deformed neutron stars
• A new quark-hadron hybrid equation of state for astrophysics - I. High-mass twin compact stars
• Detecting gravitational wave emission from the known accreting neutron stars
• A NICER view of PSR J0030+0451: evidence for a global-scale multipolar magnetic field
• Probing the Equation of State of Nuclear Matter via Neutron Star Asteroseismology
• Proto-neutron stars with heavy baryons and universal relations
• Gravitational wave asteroseismology with protoneutron stars
• Core-collapse supernova simulations and the formation of neutron stars, hybrid stars, and black holes
• Probing mass-radius relation of protoneutron stars from gravitational-wave asteroseismology
• Charged-Current Muonic Reactions in Core-Collapse Supernovae
• Dependence of outer boundary condition on protoneutron star asteroseismology with gravitational-wave signatures
• Universal relation for supernova gravitational waves
• Role of medium modifications for neutrino-pair processes from nucleon-nucleon bremsstrahlung - Impact on the protoneutron star deleptonization
• Phenomenological quark-hadron equations of state with first-order phase transitions for astrophysical applications
• Universal relations for rapidly rotating cold and hot hybrid star
• Determination of properties of protoneutron stars toward black hole formation via gravitational wave observations
• Impact of Nucleon-Nucleon Bremsstrahlung Rates Beyond One-Pion Exchange
• Medium modifications for light and heavy nuclear clusters in simulations of core collapse supernovae -- Impact on equation of state and weak interactions
• QCD phase transition drives supernova explosion of a very massive star
• Long-term gravitational wave asteroseismology of supernova: from core collapse to 20 seconds postbounce
• Universality in quasinormal modes of neutron stars with quark-hadron crossover
• Constraining the onset density for the QCD phase transition with the neutrino signal from core-collapse supernovae
• Nucleosynthetic Yields from Neutron Stars Accreting in Binary Common Envelopes
• Population Synthesis of Massive Close Binary Evolution
• Implementation of Cluster expansion for hot QCD matter

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• Properties of the Object HESS J1731-347 as a Twin Compact Star