轨道周期为12分钟的分离白矮星双星
A 12 minute Orbital Period Detached White Dwarf Eclipsing Binary
摘要：
我们发现了一对分离的白矮星（WD），其轨道周期为12.75分钟，径向速度振幅为1,315 km/s。我们使用它的光变曲线测量系统的全部轨道参数，该光变曲线显示椭球变化、多普勒增强以及主日食和次日食。主要的是0.25 Msun潮汐畸变氦WD，只有第二潮汐畸变WD已知。看不见的次级是0.55 Msun碳氧WD。由于引力波辐射造成的能量和角动量损失，两个WD将在90万年后接触。一旦接触，系统可能合并产生快速旋转的大质量WD，形成稳定的相互作用双星，或可能爆炸为Ia型暗超新星。该系统目前的引力波应变为10^-22，大约是赫尔斯-泰勒脉冲星的10，000倍;该系统将在运行的第一周被拟议的LISA引力波任务探测到。这个系统轨道周期的快速变化将为广义相对论提供一个基本的检验。
英文摘要：
We have discovered a detached pair of white dwarfs (WDs) with a 12.75 min orbital period and a 1,315 km/s radial velocity amplitude. We measure the full orbital parameters of the system using its light curve, which shows ellipsoidal variations, Doppler boosting, and primary and secondary eclipses. The primary is a 0.25 Msun tidally distorted helium WD, only the second tidally distorted WD known. The unseen secondary is a 0.55 Msun carbon-oxygen WD. The two WDs will come into contact in 0.9 Myr due to loss of energy and angular momentum via gravitational wave radiation. Upon contact the systems may merge yielding a rapidly spinning massive WD, form a stable interacting binary, or possibly explode as an underluminous supernova type Ia. The system currently has a gravitational wave strain of 10^-22, about 10,000 times larger than the Hulse-Taylor pulsar; this system would be detected by the proposed LISA gravitational wave mission in the first week of operation. This system's rapid change in orbital period will provide a fundamental test of general relativity.
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