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Constraining twin stars with cold neutron star cooling data

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arxiv 2408.05287 v2 pith:3OVSRRAL submitted 2024-08-09 astro-ph.HE nucl-th

Constraining twin stars with cold neutron star cooling data

classification astro-ph.HE nucl-th
keywords starphasetwincoolingdensityneutronquarktransition
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the influence of a phase transition from hadronic matter to a deconfined quark phase inside a neutron star on its cooling behaviour including the appearance of twin star solutions in the mass-radius diagram. We find that while the inferred neutrino luminosity of cold transiently-accreting star in MXB $1659\text{-}29$ is reproduced in all of the constructed twin star models, the luminosity of a colder source, the neutron star in SAX J$1808.4\text{-}3658$, cannot be described by equations of state with quark-hadron transition densities below $1.7$ saturation density, suggesting that twin stars with such low density transitions to the quark phase are not realized in nature. We also discuss how constraints to the quark-hadron phase transition density are strongly dependent on the cooling effectiveness of neutrino reactions in the quark phase.

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Cited by 2 Pith papers

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  1. Strongly Interacting Dark Matter admixed Neutron Stars

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    Strongly interacting dark matter described by a first-principles G2 gauge-theory equation of state can be mixed into neutron stars while remaining compatible with current observational constraints.

  2. Quantifying the Information Gain from Future High-Precision Radius Measurements for Identifying Twin Neutron Stars

    astro-ph.HE 2026-07 reject novelty 4.0

    The paper claims a radius precision of ~0.2 km is enough to extract most Bayesian information for identifying twin neutron stars, but its own distinguishability and entropy analyses suggest notable gains remain down t...