Eisner et al. (2022) reported the discovery of TIC 470710327, a massive compact hierarchical triple star system. TIC 470710327 is comprised of a compact (1.10 d) circular eclipsing binary, with total mass $\approx 10.9-13.2\ \rm{M_{\odot}}$, and a more massive ($\approx 14-17\ \rm{M_{\odot}}$) eccentric non-eclipsing tertiary in a $52.04$ d orbit. Here we present a progenitor scenario for TIC 470710327 in which '2+2' quadruple dynamics result in Zeipel-Lidov-Kozai (ZLK) resonances that lead to a contact phase of the more massive binary. In this scenario, the two binary systems should form in a very similar manner, and dynamics trigger the merger of the more massive binary either during late phases of star formation or several Myr after the zero-age main sequence (ZAMS), when the stars begin to expand. Any evidence that the tertiary is a highly-magnetised ($\sim 1-10$ kG), slowly-rotating blue main-sequence star would hint towards a quadruple origin. Finally, our scenario suggests that the population of inclined, compact multiple-stellar systems is reduced into co-planar systems, via mergers, late during star formation or early in the main sequence. The elucidation of the origin of TIC 470710327 is crucial in our understanding of multiple massive-star formation and evolution.

中文翻译：

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由紧凑型多星系统中的动态共振引发的合并：大型三重 TIC 的恒星减少案例 470710327

艾斯纳等人。（2022 年）报告了 TIC 470710327 的发现，这是一个巨大的紧凑分层三联星系统。TIC 470710327 由一个紧凑的 (1.10 d) 圆形食双星组成，总质量为 $\约 10.9-13.2\ \rm{M_{\odot}}$，而质量更大的 ($\约 14-17\ \rm {M_{\odot}}$) 在 $52.04$ d 轨道上的偏心非食第三星。在这里，我们提出了 TIC 470710327 的前身场景，其中“2+2”四重动力学导致 Zeipel-Lidov-Kozai (ZLK) 共振，导致更大质量的二元的接触相。在这种情况下，两个双星系统应该以非常相似的方式形成，并且动力学会在恒星形成的后期或零年龄主序星（ZAMS）之后的几个 Myr 期间触发更大质量的双星合并，当恒星开始扩大。任何证明第三星是高度磁化（$\sim 1-10$ kG）、缓慢旋转的蓝色主序星的证据都将暗示它是四星起源。最后，我们的设想表明，倾斜的、致密的多星系统的种群通过合并、恒星形成后期或主序带早期减少为共面系统。阐明 TIC 470710327 的起源对于我们理解多颗大质量恒星的形成和演化至关重要。