论文标题
剥去二进制的星星 - 活力波源
Stars stripped in binaries -- the living gravitational wave sources
论文作者
论文摘要
二元相互作用会导致剥离出恒星的信封，从而大大降低恒星的半径。因此，由剥离的恒星和紧凑物体组成的二进制的轨道可以非常紧，以至于系统产生的重力辐射达到了激光干涉仪空间天线（LISA）可访问的频率。到目前为止，已知有两颗具有白色矮人的紧密轨道中的脱落恒星（ZTF J2130+4420和CD-30 11223），但预计还会存在更多。这些二进制文件为二进制进化模型提供了重要的约束，可以用作LISA验证来源。我们开发了一种蒙特卡洛代码，该代码使用详细的进化模型模拟带有中子星或白矮人伴侣的紧身轨道中剥落的恒星的银河种群。我们预测，在与Lisa进行了10年的观测后，预测0-100个剥离的恒星 +白色矮人的二进制组和0-4剥离的恒星 +中子星二进制二进制二进制。这些二进制文件中有90％以上有望显示出$ \ gtrsim 200 $ km/s的大径向速度变化，在光谱上可检测到。预计由于潮汐变形而导致的光度变异性也有望在ZTF J2130 + 4420和CD-30 11223中观察到。此外，剥离的Star + Neutron Star Binaries预计将X射线X射线X射线X射线X射线明亮，$ l_x \ l_x \ gtrsim 10^{33} {33} {33} {33} - 10^36} $ g {36} $ er。我们的结果表明，被剥离的恒星二进制文件是即将到来的电磁波和重力波设施的多通间源。
Binary interaction can cause stellar envelopes to be stripped, which significantly reduces the radius of the star. The orbit of a binary composed of a stripped star and a compact object can therefore be so tight that the gravitational radiation the system produces reaches frequencies accessible to the Laser Interferometer Space Antenna (LISA). Two such stripped stars in tight orbits with white dwarfs are known so far (ZTF J2130+4420 and CD-30 11223), but many more are expected to exist. These binaries provide important constraints for binary evolution models and may be used as LISA verification sources. We develop a Monte Carlo code that uses detailed evolutionary models to simulate the Galactic population of stripped stars in tight orbits with either neutron star or white dwarf companions. We predict 0-100 stripped star + white dwarf binaries and 0-4 stripped star + neutron star binaries with SNR>5 after 10 years of observations with LISA. More than 90% of these binaries are expected to show large radial velocity shifts of $\gtrsim 200$ km/s, which are spectroscopically detectable. Photometric variability due to tidal deformation of the stripped star is also expected and has been observed in ZTF J2130+4420 and CD-30 11223. In addition, the stripped star + neutron star binaries are expected to be X-ray bright with $L_X \gtrsim 10^{33} - 10^{36}$ erg/s. Our results show that stripped star binaries are promising multi-messenger sources for the upcoming electromagnetic and gravitational wave facilities.
