Formation channels of gravitationally resolvable double white dwarf binaries inside globular clusters

IF 5.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
L. Hellström, M. Giersz, A. Askar, A. Hypki, Y. Zhao, Y. Lu, S. Zhang, V. Vázquez-Aceves, G. Wiktorowicz
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Abstract

Current gravitational wave detectors are sensitive to coalescing black holes and neutron stars. However, double white dwarfs (DWDs) have long been recognized as promising sources of gravitational waves, and upcoming detectors such as LISA will be able to observe these systems in abundance. Double white dwarfs are expected to be the dominant gravitational wave (GW) sources in parts of the LISA frequency range, making it crucial to understand their formation for future detections. The Milky Way contains many white dwarfs (WDs) in both the field and star clusters, promising a rich population of DWDs for LISA. However, the large number of sources may make it difficult to resolve individual binaries, and DWDs in the field and clusters often have similar properties, complicating the identification of their origins from GW signals alone. In this work, we focus on eccentric and tight DWDs, which cannot form in the field, but require dynamical interactions in dense clusters to increase their eccentricity after circularization through mass transfer phases and common-envelope evolution during binary evolution. These binaries may also form in three- and four-body dynamical interactions, whereby a DWD binary may directly form with high eccentricity and low separation. Our results show that we should expect eccentric and tight DWDs in clusters that can provide a meaningful GW signal; however, the number is low, with an upper limit of 10-15 in the MW. These can be used to independently obtain the distances of their host clusters.
球状星团内引力可分辨的双白矮星双星的形成通道
目前的引力波探测器对合并的黑洞和中子星很敏感。然而,双白矮星(DWDs)长期以来一直被认为是有希望的引力波来源,即将到来的探测器,如LISA,将能够大量观测到这些系统。在LISA的部分频率范围内,双白矮星有望成为主要的引力波(GW)源,因此了解它们的形成对未来的探测至关重要。银河系在野外和星团中都有许多白矮星(WDs),为LISA提供了丰富的白矮星种群。然而,大量的信号源可能会使解析单个二进制变得困难,并且场和簇中的dwd通常具有相似的属性,这使得仅从GW信号中识别其来源变得复杂。在这项工作中,我们关注的是偏心和紧密DWDs,它们不能在现场形成,但需要在密集的团簇中进行动态相互作用,以增加它们在双星演化过程中通过传质阶段和共包络演化的圆化后的偏心。这些双星也可以在三体和四体动力学相互作用中形成,因此DWD双星可以直接形成高偏心和低分离。我们的研究结果表明,我们应该期望在集群中偏心和紧密的DWDs可以提供有意义的GW信号;然而,这个数字很低,在MW中上限为10-15。这些可以用来独立地获得它们的主机集群的距离。
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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