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arXiv · 2411.17234

Constraints on color-flavor locked quark matter in view of the HESS J1731-347 measurement

K. Kourmpetis·P. Laskos-Patkos·Ch. C. Moustakidis
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Abstract

Astrophysical observations play a crucial role in understanding the processes within compact stars. A recent study measured the central object in the HESS J1731-347 supernova remnant (SNR), estimating its mass at $M=0.77^{+0.20}_ {-0.17} \ M_\odot$ and radius at $R = 10.40^{+0.86}_{-0.78} \ \mathrm{km}$, identifying it as the lightest neutron star ever observed. Conventional models suggest neutron stars form with a minimum gravitational mass of approximately $1.17 \ M_\odot$, raising the question of whether this object is a typical neutron star or possibly an "exotic" star. To investigate, we utilize the Color-Flavor Locked (CFL) equation of state (EoS), integrating data from the HESS J1731-347 measurement with pulsar observations and gravitational wave detections. Additionally, we construct hybrid EoS by combining the MDI-APR1 (hadronic) and CFL (quark) EoS, introducing a phase transition through Maxwell construction. Our findings reveal that absolutely stable CFL quark matter effectively explains all observed measurements, including the central object of HESS J1731-347, whereas hybrid models incorporating the CFL MIT Bag model cannot account for the masses of the most massive observed pulsars.

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K. Kourmpetis, P. Laskos-Patkos, Ch. C. Moustakidis. 2024-11-26. Constraints on color-flavor locked quark matter in view of the HESS J1731-347 measurement. https://doi.org/10.12681/hnpsanp.8013

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