论文标题
合并是由紧凑型,多星系动态的促进的:大规模三重抽动470710327的恒星还原案例
Mergers prompted by dynamics in compact, multiple-star systems: a stellar-reduction case for the massive triple TIC 470710327
论文作者
论文摘要
TIC 470710327是一种巨大的紧凑型分层三星级系统,最近由NASA的过境系外行星调查卫星(TESS)鉴定出来。 TIC 470710327由紧凑型(1.10 d)圆形的二进制组成,总质量$ \ 10.9-13.2 \ \ rm {m _ {\ odot}} $,以及更大的($ \ $ \ 14-17 \ \ \ \ \ \ \ \ \ \ \ rm _ {m _ {\ odot} $ $ 52.04 $ d轨道。在这里,我们提出了TIC 470710327的祖细胞场景,其中“ 2+2”四倍动力学导致Zeipel-Lidov-Kozai(ZLK)共振,导致更大的二进制的接触阶段。在这种情况下,两个二进制系统应以非常相似的方式形成,动力学会触发恒星形成的后期阶段的合并,或者在星星开始扩展时零量主序列(ZAMS)之后的几名MYR。任何证据表明三级是高度磁化的($ \ sim 1-10 $ kg),缓慢旋转的蓝色主序列明星都会暗示四倍的起源。最后,我们的情景表明,倾斜的,紧凑的多晶状体系统的种群通过合并,恒星形成期间或主要序列早期减少到共同计划系统中。 TIC 470710327起源的阐明对于我们对多种大型明星形成和进化的理解至关重要。
TIC 470710327, a massive compact hierarchical triple-star system, was recently identified by NASA's Transiting Exoplanet Survey Satellite (TESS). 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.