FAST银道面脉冲星快照巡天：VII. 六颗与大质量白矮星伴星处于紧凑轨道中的毫秒脉冲星
The FAST Galactic Plane Pulsar Snapshot Survey: VII. Six millisecond pulsars in compact orbits with massive white dwarf companions
AI总结：
本文报告了FAST在银道面脉冲星快照巡天中发现的六颗处于紧凑轨道且带有大质量白矮星伴星的中等质量双星毫秒脉冲星，使该类脉冲星数量翻倍，并利用Shapiro延迟精确限制了两颗脉冲星的质量。
摘要：
带有大质量白矮星（WD）伴星的双星毫秒脉冲星是中等质量双星脉冲星（IMBPs）。如果它们处于轨道周期小于1天的紧凑轨道中，则是通过Case BB洛希瓣溢出演化通道形成的。它们在已知的脉冲星种群中相当罕见；此前仅发现了五颗这样的IMBPs，其中一颗位于球状星团中。在此，我们报告了六颗处于紧凑轨道中的IMBPs：PSRs J0416+5201、J0520+3722、J1919+1341、J1943+2210、J1947+2304和J2023+2853，它们是在银河系平面脉冲星快照巡天期间利用五百米口径球面射电望远镜发现的，由于在5分钟的短巡天时间内具有高巡天灵敏度，使此类IMBPs的数量翻倍。后续的计时观测表明，它们都拥有质量大于约0.8~$M_\odot$的CO WD或ONeMg WD伴星，且处于偏心率在$\lesssim10^{-5}$量级的非常圆的轨道中。PSR J0416+5201应该是一个ONeMg WD伴星，其显著的最小质量为1.28 $M_\odot$。这些大质量WD伴星导致PSRs J0416+5201、J0520+3722、J1943+2210和J2023+2853产生了可探测的Shapiro延迟，表明它们的轨道高度倾斜。通过测量Shapiro延迟，J1943+2210的脉冲星质量被限制为1.84$^{+0.11}_{-0.09}$~$M_\odot$，而PSR J2023+2853的脉冲星质量被限制为1.28$^{+0.06}_{-0.05}$~$M_\odot$。
英文摘要：
Binary millisecond pulsars with a massive white dwarf (WD) companion are intermediate-mass binary pulsars (IMBPs). They are formed via the Case BB Roche-lobe overflow evolution channel if they are in compact orbits with an orbital period of less than 1 day. They are fairly rare in the known pulsar population; only five such IMBPs have been discovered before, and one of them is in a globular cluster. Here we report six IMBPs in compact orbits: PSRs J0416+5201, J0520+3722, J1919+1341, J1943+2210, J1947+2304 and J2023+2853, discovered during the Galactic Plane Pulsar Snapshot survey by using the Five-hundred-meter Aperture Spherical radio Telescope, doubling the number of such IMBPs due to the high survey sensitivity in the short survey time of 5 minutes. Follow-up timing observations show that they all have either a CO WD or an ONeMg WD companion with a mass greater than about 0.8~$M_\odot$ in a very circular orbit with an eccentricity in the order of $\lesssim10^{-5}$. PSR J0416+5201 should be an ONeMg WD companion with a remarkable minimum mass of 1.28 $M_\odot$. These massive WD companions lead to a detectable Shapiro delay for PSRs J0416+5201, J0520+3722, J1943+2210, and J2023 +2853, indicating that their orbits are highly inclined. From the measurement of the Shapiro delay, the pulsar mass of J1943+2210 was constrained to be 1.84$^{\,+0.11}_{-0.09}$~$M_\odot$, and that of PSR J2023+2853 to be 1.28$^{\,+0.06}_{-0.05}$~$M_\odot$.
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