论文标题
eppur si muove ...关于红色巨星长期中期的起源
Eppur si muove... On the Origin of Long Secondary Periods in Red Giant Stars
论文作者
论文摘要
在三分之一的脉动红色巨型和超级巨星中观察到的长期二级（LSP）是目前已知的唯一无法解释的大振幅恒星变异性的类型。许多作者探索了LSP的来源的各种情况，但无法最终解决此问题。我们提出了LSP变量的已知特性，并显示了新的结果，证明了负责LSP的物理机制是二进制的。也就是说，LSP的光变化是由于存在尘土飞扬的云层与棕色矮人的伴侣一起绕着红色的巨人旋转，并每轨道掩盖了恒星一次。在这种情况下，低质量的同伴是一个前行星，它从其宿主星的信封中吸收了大量质量，并成长为棕色矮人。
Long secondary periods (LSPs), observed in a third of pulsating red giant and supergiant stars, are the only unexplained type of large-amplitude stellar variability known at this time. Numerous authors have explored various scenarios for the origin of LSPs, but were unable to give a final solution to this problem. We present known properties of LSP variables and show new results proving that the physical mechanism responsible for LSPs is binarity. Namely, the LSP light changes are due to the presence of a dusty cloud orbiting the red giant together with a brown-dwarf companion and obscuring the star once per orbit. In this scenario, the low-mass companion is a former planet that accreted a significant amount of mass from the envelope of its host star and grew into a brown dwarf.
