Distinguishing black-hole spin-orbit resonances by their gravitational-wave signatures
Distinguishing black-hole spin-orbit resonances by their gravitational-wave signatures
复制标题
通过引力波特征区分黑洞自旋轨道共振
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
U. Sperhake
中科院分区：
文献类型：
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作者：
D. Gerosa;R. O’Shaughnessy;M. Kesden;E. Berti;U. Sperhake
如果双星黑洞是在足够大质量的双星的连续核心坍缩之后形成的，那么进动动力学可能会将它们的自旋S1和S2以及轨道角动量L对齐到一个平面中，在这个平面中它们共同围绕总角动量J进动。这种自旋-轨道共振存在两个家族，根据轨道平面中两个自旋的分量是对齐的还是反对齐的来区分。双星黑洞在每个家族中所占的比例取决于其祖先的恒星演化，因此如果引力波探测器能够测量这一比例，它们就可以为双星黑洞的天体物理形成场景提供重要的见解。在本文中，我们证明了即使在沿J方向沿着观测到二元黑洞的保守假设下（其中对重力波形的岁差引起的调制被最小化），在信噪比ρ ≤ 10的事件中，每个共振族的许多成员的波形可以与另一族的所有成员区分开，这是先进LIGO和Virgo首次探测到的典型结果。我们希望，我们的初步发现激发引力波探测器的能力，以约束恒星天体物理学和刺激进一步研究的自旋轨道共振家庭在更广泛的地区的二元黑洞参数空间的可扩展性更大的赞赏。
If binary black holes form following the successive core collapses of sufficiently massive binary stars, precessional dynamics may align their spins, S1 and S2, and the orbital angular momentum L into a plane in which they jointly precess about the total angular momentum J. These spin orientations are known as spin-orbit resonances since S1, S2, and L all precess at the same frequency to maintain their planar configuration. Two families of such spin-orbit resonances exist, differentiated by whether the components of the two spins in the orbital plane are either aligned or antialigned. The fraction of binary black holes in each family is determined by the stellar evolution of their progenitors, so if gravitational-wave detectors could measure this fraction they could provide important insights into astrophysical formation scenarios for binary black holes. In this paper, we show that even under the conservative assumption that binary black holes are observed along the direction of J (where precession-induced modulations to the gravitational waveforms are minimized), the waveforms of many members of each resonant family can be distinguished from all members of the other family in events with signal-to-noise ratios ρ≃10, typical of those expected for the first detections with Advanced LIGO and Virgo. We hope that our preliminary findings inspire a greater appreciation of the capability of gravitational-wave detectors to constrain stellar astrophysics and stimulate further studies of the distinguishability of spin-orbit resonant families in more expanded regions of binary black-hole parameter space.