Hybrid neutron stars in the mass-radius diagram

Abstract

We present a systematic investigation of the possible locations for the special point (SP), a unique feature of hybrid neutron stars in the mass-radius. The study is performed within the two-phase approach where the high-density (quark matter) phase is described by the constant-sound-speed (CSS) equation of state (EoS) and the nuclear matter phase around saturation density is varied from very soft (APR) to stiff (DD2 with excluded nucleon volume. Different construction schemes for the deconfinement transition are applied: Maxwell construction, mixed phase construction and parabolic interpolation. We demonstrate for the first time that the SP is invariant not only against changing the nuclear matter EoS, but also against variation of the construction schemes for the phase transition. Since the SP serves as a proxy for the maximum mass and accessible radii of massive hybrid stars, we draw conclusions for the limiting masses and radii of hybrid neutron stars.

7 pages, 5 figures, 1 table, accepted for publication in Astronomische Nachrichten

References in corpus (13)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
• Neutron-star radius constraints from GW170817 and future detections
• Was GW170817 a canonical neutron star merger? Bayesian analysis with a third family of compact stars
• Extreme Matter meets Extreme Gravity: Ultra-heavy neutron stars with crossovers and first-order phase transitions
• The Radius of PSR J0740+6620 from NICER and XMM-Newton Data
• Neutron-star radii based on realistic nuclear interactions
• Impact of massive neutron star radii on the nature of phase transitions in dense matter
• Special point on the mass radius diagram of hybrid stars

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• Impact of massive neutron star radii on the nature of phase transitions in dense matter
• A Bayesian analysis of the properties of hybrid stars with the NJL model
• Speed of Sound in Hybrid Stars and the Role of Bag Pressure in the Emergence of Special Points on M-R Variation of Hybrid Stars
• XTE J1814-338 as a dark matter admixed neutron star
• Hybrid star phenomenology from the properties of the special point
• Neutron star properties with careful parameterization in the (axial)vector meson extended linear sigma model
• Hybrid Equations of State for Neutron Stars with Hyperons and Deltas
• A Detailed Analysis of the Special Points on $M-R$ Solutions of Hybrid (Twin) Stars
• Implications of supermassive neutron stars for the form of the equation of state of hybrid stars
• Locating the special point of hybrid neutron stars
• Fastest spinning millisecond pulsars: indicators for quark matter in neutron stars?
• Rotational Properties of Inverted Hybrid Stars
• Special point "trains" in the M-R diagram of hybrid stars
• Rapidly Spinning Massive Pulsars as an Indicator of Quark Deconfinement
• Bayesian inference favors quark matter in neutron star interiors
• The sharpness of the quark-hadron transition and the properties of hybrid stars
• Density functional approach to quark matter with confinement and color superconductivity