Colour-Flavour Locked Quark Stars in Light of the Compact Object in HESS J1731-347 and the GW190814 Event

Abstract

The central compact object within HESS J1731- 347 possesses unique mass and radius properties that renders it a compelling candidate for a self-bound star. In this research, we examine the capability of quark stars composed of colour superconducting quark matter to explain the latter object by using its marginalised posterior distribution and imposing it as a constraint on the relevant parameter space. Namely, we investigate quark matter for $N_f=2,3$ in the colour superconducting phase, incorporating perturbative QCD corrections, and we derive their properties accordingly. The utilised thermodynamic potential of this work possesses an MIT bag model formalism with the parameters being established as flavour-independent. In this instance, we conclude the favour of 3-flavour over 2-flavour colour superconducting quark matter, isolating our interest on the former. The parameter space is further confined due to the additional requirement for a high maximum mass ($M_{\text{TOV}}\ge 2.6M_{\odot }$), accounting for GW$190814$'s secondary companion. We pay a significant attention on the speed of sound and the trace anomaly (proposed as a measure of conformality [\href{https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.129.252702}{10.1103/PhysRevLett.129.252702}]). We conclude that it is possible for colour-flavour locked quark stars to reach high masses without violating the conformal bound or the $⟨\Theta {⟩}_{{\mu }_B}\ge 0$ if the quartic coefficient value ${\alpha }_4$ does not exceed an upper limit which is solely dependent on the established $M_{\text{TOV}}$. For $M_{\text{TOV}}=2.6M_{\odot }$, we find that the limit reads ${\alpha }_4\le 0.594$. Lastly, a further study takes place on the agreement of colour-flavour locked quark stars with additional astrophysical objects including the GW$170817$ and GW$190425$ events, followed by a relevant discussion.

13 pages, 10 figures, 2 tables

References in corpus (29)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• A Massive Pulsar in a Compact Relativistic Binary
• 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
• GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4M_{\odot }$
• Color superconductivity in dense quark matter
• Tidal Love numbers of neutron stars
• Constraining neutron star tidal Love numbers with gravitational wave detectors
• A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
• Relativistic theory of tidal Love numbers
• PSR J0952-0607: The Fastest and Heaviest Known Galactic Neutron Star
• Cold Quark Matter
• Sound velocity bound and neutron stars
• Neutron star mass and radius measurements from atmospheric model fits to X-ray burst cooling tail spectra
• On the Sound Speed in Neutron Stars
• Trace anomaly as signature of conformality in neutron stars
• Was GW190814 a black hole -- strange quark star system?
• Reaching percolation and conformal limits in neutron stars
• Unified Interacting Quark Matter and its Astrophysical Implications
• A general, scale-independent description of the sound speed in neutron stars
• A light strange star in the remnant HESS J1731-347: minimal consistency checks
• QCD color superconductivity in compact stars: color-flavor locked quark star candidate for the gravitational-wave signal GW190814
• Bayesian inference of strange star equation of state using the GW170817 and GW190425 data
• Twin stars as probes of the nuclear equation of state: effects of rotation through the PSR J0952-0607 pulsar and constraints via the tidal deformability from the GW170817 event
• Recovering the conformal limit of color superconducting quark matter within a confining density functional approach
• Tidal deformability of strange stars and the GW170817 event
• Nuclear and Hybrid Equations of State in Light of the Low-Mass Compact Star in HESS J1731-347
• Insights on the peak in the speed of sound of ultradense matter
• Speed of sound in dense matter and two families of compact stars

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• Hybrid stars in light of the HESS J1731-347 remnant and the PREX-II experiment
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• Hybrid Strangeon Stars
• Speed of sound bounds and first-order phase transitions in compact stars
• Recent progresses in strange quark stars
• Two-flavor color superconducting quark stars may not exist
• Universal relations for anisotropic interacting quark stars
• Analyzing the dense matter equation of states in the light of the compact object HESS J1731-347
• Strange stars admixed with dark matter: equiparticle model in a two fluid approach
• Vetting quark-star models with gravitational waves in the hierarchical Bayesian framework
• Pair creation in hot electrosphere of compact astrophysical objects
• Confronting recent light compact star observations with color-flavor locked quark matter
• Properties of the Object HESS J1731-347 as a Twin Compact Star
• Constraints on color-flavor locked quark matter in view of the HESS J1731-347 measurement
• On the Cooling of Compact Stars in Light of the HESS J1731-347 Remnant