A significant fraction of the most massive stars move through space with a high velocity. One of the possible physical explanations is that a supernova in a compact binary system results in a high recoil velocity of the system. If the system remains bound, it can be subsequently observed as a spectroscopic binary (SB1), a high-mass X-ray binary, a compact binary, and finally a gravitational-wave event. If such a system is traced back to its parent cluster, binary evolution models can be tested in great detail. The Gaia proper motions and parallaxes are used to demonstrate that the high-mass X-ray binary HD153919/4U 1700-37 originates from NGC6231, the nucleus of the OB association Sco OB1. The O supergiant and its compact companion, of which the physical nature (a neutron star or a black hole) is unknown, move with a space velocity of 63 km/s with respect to NGC6231. The kinematical age of the system is 2.2 Myr. The parallaxes and accurate proper motions in Gaia DR2 were used to perform a membership analysis of NGC 6231. The distance to NGC6231 is 1.63 kpc. Isochrone fitting results in an age of 4.7 Myr. With the identification of NGC6231 as the parent cluster, the upper limit on the age of the progenitor of 4U1700-37 at the moment of the supernova explosion is 3.0 Myr. With these constraints, the evolutionary history of the system can be reconstructed with an initial mass of the progenitor of the compact object >60 Msun. Given its current high space velocity and the derived evolutionary history, the compact object in the system is more likely to have received a large natal kick, which suggests that it is more likely a neutron star than a black hole. HD153919/4U1700-37 might be a prototype in the Milky Way for the progenitor of gravitational wave events such as GW190412
A hyper-runaway white dwarf in Gaia DR2 as a Type Iax supernova primary remnant candidate
观测与Ia型和Iax型超新星有关的恒星残骸对于充分了解它们的祖先是必要的。多个祖先的情况下预测人口踢供体残留物和部分燃烧的初级残留物，都以相对较高的速度移动。但只有少数的例子符合这两个预测的人口已被观察到。在这里，我们报告了可能是第一个已知的例子，一个未绑定的白矮星，这是一致的完全冷却的主要遗迹，以Iax型超新星。候选天体LP 93-21以银河系中心速度v $_{gal}$ $\simeq$ 605 km s $^{-1}$运行，并且引力与银河系无关。我们排除了银河系外的起源。Iax型超新星喷发的情况与其独特的未绑定轨迹是一致的，因为通过光谱跟踪在其光球层中检测到异常元素丰度。这一发现反映了最近的模型，该模型表明恒星喷射可能经常发生。不幸的是，由于白矮星本身的微弱性，以及与它们的直接祖先系统相关的不确定性，使得探测和确认这样的供体变得困难。
Evolution of binaries containing a hot subdwarf and a white dwarf to double white dwarfs, and double detonation supernovae with hypervelocity runaway stars
Max Planck Institut für Astrophysik（马克斯·普朗克天体物理学研究所）；Center for Astrophysics | Harvard & Smithsonian（哈佛-史密森尼天体物理中心）
