Constraints on color-flavor locked quark matter in view of the HESS J1731-347 measurement
arXiv:2411.17234 · doi:10.12681/hnpsanp.8013
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 and radius at , identifying it as the lightest neutron star ever observed. Conventional models suggest neutron stars form with a minimum gravitational mass of approximately , 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.
v1: 6 pages, 6 figures, 1 table; v2: 6 pages, 6 figures; updated to match the published version in the proceedings of the 32nd Symposium of the Hellenic Nuclear Physics Society (HNPS 2024)
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