论文标题
He-Star捐赠者AM CVN明星及其祖先作为丽莎消息来源
He-star donor AM CVn stars and their progenitors as LISA sources
论文作者
论文摘要
AM CVN类型的超级灾难变量（CVS）被视为对未来空间重力波检测器（例如激光干涉仪空间天线（LISA））的重要验证源。我们用HE-Star捐助者对当今AM CVN星的银河系人口进行建模。人们早已期望这样的人群存在，尽管只有几个候选人。我们应用了二元种群合成（BPS）的混合方法，该方法通过快速的BPS代码结合了AMCVN星的直接前体群体的模拟，并通过完整的进化代码随后跟踪其进化。该模型预测，星系中He-Donor AM CVN星的当前出生率为$ 4.6 \ times 10^{ - 4} $每年，而Galaxy May May拥有该类别的大约112000个对象，其轨道周期小于42-43 min。丽莎的前景混乱极限和仪器噪声阻止了引力波中更长的时期系统。我们发现，在4年任务期间，Lisa可以以信噪比（S/N）> 5检测约500名HE-Star AM CVN。在距太阳1 kpc之内，如果在电磁谱中检测到，则可能存在130个He-Star AM CVN，其周期在同一范围内，可以用作验证二进制。以银河系的方式，AM CVN恒星也有大约14800个直接前体。他们是具有剥离的低质量HE-Star和白矮人的脱离系统的独立系统，其中大约75岁的丽莎可能会在其任务中观察到。
Ultracompact cataclysmic variables (CVs) of the AM CVn type are deemed to be important verification sources for the future space gravitational wave detectors such as the Laser Interferometer Space Antenna (LISA). We model the present-day Galactic population of AM CVn stars with He-star donors. Such a population has long expected to exist, though only a couple of candidates are known. We applied the hybrid method of binary population synthesis (BPS) which combines a simulation of the population of immediate precursors of AM CVn stars by a fast BPS code with subsequent tracking of their evolution by a full evolutionary code. The model predicts that the present birthrate of He-donor AM CVn stars in the Galaxy is $4.6\times 10^{-4}$ per yr and the Galaxy may harbour about 112000 objects of this class which have orbital periods less than 42-43 min. The foreground confusion limit and instrumental noise of LISA prevent the discovery of longer periods systems in gravitational waves. We find that about 500 He-star AM CVns may be detected by LISA with signal-to-noise ratio (S/N)>5 during a 4 yr mission. Within 1 Kpc from the Sun, there may exist up to 130 He-star AM CVns with the periods in the same range, which may serve as verification binaries, if detected in the electromagnetic spectrum. In the Milky Way, there are also about 14800 immediate precursors of AM CVn stars. They are detached systems with a stripped low-mass He-star and a white dwarf companion, out of which about 75 may potentially be observed by LISA during its mission.
