中国天眼FAST通过韩金林研究团队发现了极短周期、总质量最轻的双中子星系统PSRJ1856-0039 1。该系统轨道周期仅2.36小时 1，在已知双中子星系统中位列第二短，总质量为2.488倍太阳质量 1，为迄今发现的总质量最轻的双中子星组合。其中可见脉冲星质量约1.30倍太阳质量，伴星中子星质量约1.19倍太阳质量 1。
系统的多项相对论效应观测结果验证了广义相对论 1。测得的轨道周期衰减数值与广义相对论理论预测值之比为1.009±0.014 1。根据理论估算，该系统将在约8200万年后发生并合 1。相关研究成果于2026年9月15日发表于《物理评论快报》 1，被期刊编辑遴选为重点推介成果。FAST迄今已成功发现约900颗新脉冲星 1。
China's FAST (Five-hundred-meter Aperture Spherical radio Telescope) has identified an exceptionally compact binary neutron star system designated PSRJ1856-0039, marking a significant advancement in observational astrophysics.1 The discovery, made by a research team led by Han Jinlin, reveals a system with an orbital period of just 2.36 hours, placing it as the second-shortest orbital period among all known binary neutron star systems.1
The system holds the distinction of being the lightest binary neutron star combination discovered to date, with a combined mass of 2.488 solar masses.1 The visible pulsar has a mass of approximately 1.30 solar masses, while its companion neutron star weighs roughly 1.19 solar masses.1 Analysis of the system's relativistic effects has provided new validation of Einstein's theory of general relativity, with measurements of orbital period decay yielding a ratio of 1.009±0.014 when compared to theoretical predictions.1 According to calculations, this binary system is expected to undergo merger in approximately 82 million years.1
The research findings were published in Physical Review Letters on September 15, 2026, and were selected by the journal's editors as a highlighted contribution.1 This discovery adds to FAST's impressive record, as the telescope has successfully identified approximately 900 new pulsars to date.1
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