The compact neutron star in 4U 1746-37 revisited: Reassessing the mass and radius

May 13, 2026

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This research aims to provide alternative interpretations for the mass and radius estimates of the neutron star in 4U 1746-37.
Analyzed photospheric radius expansion X-ray bursts from the low-mass X-ray binary 4U 1746-37.
Introduced a blocking factor to account for reduced observed flux relative to intrinsic emission.
Solved modified photospheric radius expansion equations and employed Monte Carlo simulations for high-blocking scenarios.
Significant blocking factors (B ≳ 0.8) reduce observed flux to approximately 17% of intrinsic emission.
Revised parameters yield R = 13.0 ± 5.45 km and M = 2.12 ± 1.08 M☉.
Geometric configuration effectively reconciles large peak-to-touchdown flux ratio (approximately 2.0).

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Reveals revised mass and radius estimates for 4U 1746-37, suggesting new neutron star interpretations.

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Sung et al. (2026) studied this question.

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