Yang Z L, Han J L, Zhou D J, Jing W C, Chen W C, Wang T, Li X D, Wang S, Wang B, Ge H W, Guo Y L, Li L H, Shao Y, Liu J F, Su W Q, Hou L G, Huang W J, Jiang J C, Jiang P, Sun J H, Wang B J, Wang C, Wang H G, Wang J B, Wang N, Wang P F, Wang S Q, Xu H, Xu J, Xu R X, Yan W M, Yan Y, You X P, Yu D J, Yuan Z S, Zhang C F
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China.
School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing, China.
Science. 2025 May 22;388(6749):859-863. doi: 10.1126/science.ado0769.
A stellar common envelope occurs in a binary system when the atmosphere of an evolving star expands to encompass an orbiting companion object. Such systems are predicted to evolve rapidly, ejecting the stellar envelope and leaving the companion in a tighter orbit around a stripped star. We used radio timing to identify a pulsar, PSR J1928+1815, with a spin period of 10.55 ms in a compact binary system with an orbital period of 3.60 hours. The companion star has 1.0 to 1.6 solar masses, eclipses the pulsar for about 17% of the orbit, and is undetected at other wavelengths, so it is most likely a stripped helium star. We interpret this system as having recently undergone a common envelope phase, producing a compact binary.
当一颗演化恒星的大气层膨胀到包围一个绕轨道运行的伴星时，在双星系统中就会出现恒星共包层。预计这类系统会迅速演化，抛射出恒星包层，使伴星在围绕一颗剥离恒星的更紧密轨道上运行。我们利用射电计时在一个轨道周期为3.60小时的致密双星系统中识别出一颗脉冲星PSR J1928+1815，其自转周期为10.55毫秒。伴星质量为1.0至1.6个太阳质量，在轨道的约17%的时间里掩食脉冲星，在其他波长下未被探测到，所以它很可能是一颗剥离的氦星。我们将这个系统解释为最近经历了一个共包层阶段，形成了一个致密双星。
