来自超软X射线源的连续引力波：为十赫兹探测器提供有希望的目标
Continuous Gravitational Waves from Supersoft X-ray Sources: Promising Targets for deci-Hz Detectors
AI总结：
研究通过建模超软X射线源中白矮星的演化，发现其在十赫兹频段内可产生连续引力波，为探测器提供新目标，同时揭示白矮星内部磁场和自转特性。
摘要：
超软X射线源（SSSs）包含通过维持稳定核燃烧的物质吸积速率而生长的白矮星（WDs），导致快速质量增长、径向收缩和磁场增强。角动量从吸积盘自然地使白矮星自转加速，而增强的内部磁场在旋转轴不一致的情况下会诱导非轴对称变形。这样的白矮星会发射连续引力波（CGWs）。我们使用MESA对SSSs中的吸积白矮星的恒星质量、自转和磁场结构的耦合演化进行建模，并利用Einstein-Maxwell求解器XNS计算由此产生的四极变形。我们证明，SSSs中的白矮星，特别是在热时间尺度质量转移结束附近且接近钱德拉塞卡质量极限时，主要在可被计划中的探测器如DECIGO、BBO、Deci-Hz、ALIA和LGWA访问的十赫兹频段内产生CGWs，并且可与其他银河系CGW源如AM CVn系统、分离双白矮星和孤立白矮星区分开来。已研究的SSSs如CAL 83和RX J0019+2156可以被检测到，使针对CGW的测量得以直接探测白矮星的内部磁场和自转，同时盲搜可以揭示数百个在软X射线中被遮蔽的SSSs，从而绘制附近星系中吸积、快速自转、磁化的白矮星隐藏群体。从白矮星在SSSs中检测到CGW可能还能够识别潜在的Ia型超新星爆发前的前身。
英文摘要：
Supersoft X-ray sources (SSSs) host white dwarfs (WDs) accreting at rates that sustain steady nuclear burning, driving rapid mass growth, radial contraction, and magnetic field amplification. Angular-momentum transfer from the accretion disk naturally spins up the WD, while the amplified internal magnetic field induces a non-axisymmetric deformation in presence of a misaligned rotation. Such WDs emits continuous gravitational waves (CGWs). We model the coupled evolutions of stellar mass, spin, and magnetic structure in accreting WDs in SSSs with MESA, and compute the resulting quadrupolar deformation with the Einstein-Maxwell solver XNS. We show that WDs in SSSs, particularly near the end of thermal timescale mass transfer and close to the Chandrasekhar mass limit, produce CGWs predominantly in the deci-Hz band accessible to planned detectors such as DECIGO, BBO, Deci-Hz, ALIA, and LGWA, and are distinguishable from other Galactic CGW sources such as AM CVn systems, detached double WDs, and isolated WDs. Well studied SSSs such as CAL 83 and RX J0019+2156 can be detectable, enabling targeted CGW measurements that directly probe WD's internal magnetic fields and rotation, while blind searches can reveal hundreds of obscured SSSs otherwise missed in soft X-rays and map the hidden population of accreting, rapidly rotating, magnetized WDs in nearby galaxies. A CGW detection from WDs in SSSs could also identify potential pre-explosion Type Ia progenitors.
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。
