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arXiv 2203.08846astro-ph.SR
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白矮星双星路径巡天VII:后质量传递系统双峰分布的证据?

The White Dwarf Binary Pathways Survey VII: Evidence for a bi-modal distribution of post mass transfer systems?

F. Lagos, M. R. Schreiber, S. G. Parsons, O. Toloza, B. T. Gänsicke, M. S. Hernandez, L. Schmidtobreick, D. Belloni

摘要:

由白矮星和主序星伴星组成的双星系统,其轨道周期可达$\approx 100$ d,通常被认为是通过共同的包络演化形成的,但对这一点的了解仍然很少。为了对这些天体形成过程中的物理过程提供新的观测限制,我们正在对由一颗白矮星和一颗A到K型伴星组成的近距离双星进行大规模的观测。在这里,我们提出了三个系统的偏心轨道和轨道周期之间的$\approx10-42$ d我们的调查发现。基于HST光谱和高角分辨率图像获得的SPHERE-IRDIS,我们发现,这些系统中的两个最有可能是三重系统,而剩下的一个可能是一个二进制或分层三元组,但没有一个是后共包络二进制(PCEB)。这些系统的发现表明,我们的调查能够检测到轨道周期为几周的系统,但我们以前发现的所有六个PCEB的周期都低于2.5 d。我们认为,事实上,所有的系统,我们确定与周期的顺序周不PCEBs表示两种不同的机制之间的过渡负责形成非常接近($\lesssim 10$ d)和更广泛的WD+AFGK二进制:共同的信封演变和非保守稳定的质量转移。

英文摘要:

Binary systems consisting of a white dwarf and a main-sequence companion with orbital periods up to $\approx 100$ d are often thought to be formed through common envelope evolution which is still poorly understood. To provide new observational constraints on the physical processes involved in the formation of these objects, we are conducting a large-scale survey of close binaries consisting of a white dwarf and an A to K-type companion. Here we present three systems with eccentric orbits and orbital periods between $\approx10-42$ d discovered by our survey. Based on HST spectroscopy and high angular resolution images obtained with SPHERE-IRDIS, we find that two of these systems are most likely triple systems while the remaining one could be either a binary or a hierarchical triple but none of them is a post common envelope binary (PCEB). The discovery of these systems shows that our survey is capable to detect systems with orbital periods of the order of weeks, but all six PCEBs we have previously discovered have periods below 2.5 d. We suggest that the fact that all of the systems we identify with periods of the order of weeks are not PCEBs indicates a transition between two different mechanisms responsible for the formation of very close ($\lesssim 10$ d) and somewhat wider WD+AFGK binaries: common envelope evolution and non-conservative stable mass transfer.

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