坍缩星盘中亚太阳质量中子星形成的引力波特征
Gravitational wave signatures of subsolar neutron star formation in collapsar disks
- Columbia University（哥伦比亚大学）
- Johns Hopkins University（约翰斯·霍普金斯大学）
- Flatiron Institute（平顿研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究表征坍缩星盘中形成的亚太阳质量中子星双星的引力波特征，利用低质量与环境印记的组合产生独特波形，以区分坍缩星通道并供未来探测器检验。
AI中文摘要：
恒星核心坍缩的标准模型预言中子星的诞生质量超过一个太阳质量。在坍缩星模型中，一颗快速旋转的大质量恒星坍缩成一个黑洞，周围环绕着致密、中微子冷却的吸积盘，其外部区域在某些情况下可能碎裂成富中子团块，这些团块坍缩形成亚太阳质量中子星。这些盘中形成的天体随后可能相互并合，或经过可能的层级演化后与中心黑洞并合。在本工作中，我们表征了这些双星的引力波特征，重点关注坍缩星环境的独特特征：绕中心黑洞轨道运动引起的多普勒及其他相位调制、盘中气体驱动的迁移，以及旋近过程中的潮汐相互作用。我们表明，异常低的组分质量与这些环境印记的组合产生了独特的波形特征，可以将坍缩星通道与其他亚太阳质量并合情景区分开来。当前和下一代探测器在识别此类天体的固有性质方面具有良好前景，并且如果发现亚太阳质量并合，则可用于测试和约束坍缩星形成路径。
英文摘要：
Standard models for stellar core collapse predict the birth of neutron stars with masses exceeding a solar mass. In the collapsar model, a rapidly rotating massive star collapses to a black hole surrounded by a dense, neutrino-cooled accretion disk, whose outer regions may in some cases fragment into neutron-rich clumps that collapse to form subsolar-mass neutron stars. These disk-formed objects can then merge either with one another or, following possibly hierarchical evolution, with the central black hole. In this work, we characterize the gravitational-wave signatures of these binaries, focusing on distinctive features of the collapsar environment: Doppler and other phase modulations from orbital motion about the central black hole, gas-driven migration in the disk, and tidal interactions during inspiral. We show that the combination of anomalously low component masses with these environmental imprints produces unique waveform signatures that can distinguish the collapsar channel from other subsolar merger scenarios. Current and next-generation detectors have good prospects for identifying the intrinsic properties of such objects and, if subsolar mergers are discovered, for testing and constraining the collapsar formation pathway.
