The massive hot subdwarf binary LAMOST J065816.72+094343.1

January 7, 2026

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Key Points

The study aims to explore the nature and evolutionary future of the binary system LAMOST J065816.72+094343.1.
Analyzed archival spectroscopic data combined with new time series and high-resolution spectroscopy.
Determined orbital parameters and mass of the companion using mixed LTE and non-LTE model atmospheres.
Constrained the inclination angle via tidal synchronization and TESS light curve analysis.
Identified a massive sdOB component and a companion near the Chandrasekhar mass limit.
Confirmed the system's close orbit with a period of approximately 0.32 days.
Suggested the companion could be a white dwarf or neutron star, influencing potential type Ia supernovae outcomes.

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Observations reveal LAMOST J065816.72+094343.1's characteristics in binary evolution, indicating potential for type Ia supernovae or neutron stars.

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Mattig et al. (2026) studied this question.

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