论文标题
榆树调查。 viii。 98双白矮人二进制
The ELM Survey. VIII. 98 Double White Dwarf Binaries
论文作者
论文摘要
我们介绍了在极低的质量（ELM）调查中发现的98个独立的双白矮人（WD）二进制文件的最终样本，这是一项针对Sloan数字天空调查足迹的光谱调查<0.3 MSUN HE-CORE WDS。在整个调查过程中，我们观察到辅助低质量WD候选者（如GD278），我们显示的是p = 0.19 d双WD二进制二进制，以及候选者，这些候选者被证明是蓝色straggler/subdwarf a-subdwarf a-type a-type恒星，具有亮度太大，无法成为gaia gaia sholaxess。在这里，我们定义了一个干净的ELM WD样品，该样品在我们的目标选择和幅度范围内已完成15 <g_0 <20 mag。测量值与100％的ELM WDS一致，为0.0089 <p <1.5 d双WD二进制二元，其中35％属于银河系光环。我们推断出这些主要是He+Co WD二进制文件，鉴于测量约束。观察到的He+Co WD二进制文件的合并速率超过了稳定的传质AM AM CVN二进制文件的形成速率25倍，因此大多数HE+CO WD二进制文件必须经历不稳定的传质和合并。 J0651+2844之类的最短周期系统是标志性{\ it lisa}验证二进制文件，可以用引力波和光进行研究。
We present the final sample of 98 detached double white dwarf (WD) binaries found in the Extremely Low Mass (ELM) Survey, a spectroscopic survey targeting <0.3 Msun He-core WDs completed in the Sloan Digital Sky Survey footprint. Over the course of the survey we observed ancillary low mass WD candidates like GD278, which we show is a P=0.19 d double WD binary, as well as candidates that turn out to be field blue straggler/subdwarf A-type stars with luminosities too large to be WDs given their Gaia parallaxes. Here, we define a clean sample of ELM WDs that is complete within our target selection and magnitude range 15<g_0<20 mag. The measurements are consistent with 100% of ELM WDs being 0.0089 < P < 1.5 d double WD binaries, 35% of which belong to the Galactic halo. We infer these are mostly He+CO WD binaries given the measurement constraints. The merger rate of the observed He+CO WD binaries exceeds the formation rate of stable mass transfer AM CVn binaries by a factor of 25, and so the majority of He+CO WD binaries must experience unstable mass transfer and merge. The shortest-period systems like J0651+2844 are signature {\it LISA} verification binaries that can be studied with gravitational waves and light.
