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arXiv 2103.09858astro-ph.HEgr-qchep-th
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作为双线引力波源的超致密X射线双星

Ultra-compact X-ray binaries as dual-line gravitational-wave sources

Arthur G. Suvorov

摘要:

超致密X射线双星由于其亚小时的轨道周期,是星载引力波干涉仪LISA、太极和天琴的理想光源。这些系统中的一些包含一个中子星主,其自旋周期可以通过脉冲定时直接测量,或通过爆发现象的旋转调制间接测量。这里指出,由于积极吸积的恒星,在数百赫兹的自旋频率,可能会不断发出可观的引力波,由于存在的吸积建立的山,环形磁场,和/或$r$模式振荡,这样的双星也是候选源地面干涉仪。两个银河系(4U 1728-34和4U 1820-30)被确定为可能同时被LISA和aLIGO探测到:这种双线探测可以对中子星的质量、半径和内部磁场强度提供100级的限制。利用爱因斯坦望远镜,我们发现至少有四个已知的超紧凑双星成为双线可见。

英文摘要:

By virtue of their sub-hour orbital periods, ultra-compact X-ray binaries are promising sources for the space-borne gravitational-wave interferometers LISA, Taiji, and TianQin. Some of these systems contain a neutron star primary, whose spin period can be measured directly via pulse timing, or indirectly through rotational modulations of burst phenomena. It is pointed out here that since actively accreting stars, with spin frequencies in the hundreds of Hz, may continuously emit appreciable gravitational waves due to the presence of accretion-built mountains, toroidal magnetic fields, and/or $r$-mode oscillations, such binaries are also candidate sources for ground-based interferometers. Two Galactic systems (4U 1728-34 and 4U 1820-30) are identified as being potentially detectable by both LISA and aLIGO simultaneously: a dual-line detection of this sort could provide percent-level constraints on the mass, radius, and internal magnetic field strength of the neutron star. With the Einstein Telescope, we find that at least four of the known ultra-compact binaries become dual-line visible.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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