在七分钟轨道周期的二进制星系中,一般相对论轨道衰变
Kevin B Burdge1, Michael W Coughlin2, Jim Fuller2
1Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA, USA. kburdge@caltech.edu.
Nature
|July 26, 2019
概括
天文学家发现了一个日食双白矮星系统,ZTF J153932.16+502738.8,轨道快6.91分钟. 这个系统是一个强大的引力波源,可以被未来的激光干扰仪空间天线 (LISA) 探测到.
科学领域:
- 天体物理学
- 引力波
- 双星系统
背景情况:
- 一般相对论预测,短轨道周期的二进制星系会发出相当大的引力辐射.
- 激光干扰仪空间天线 (LISA) 任务预计将检测到许多这样的系统.
- 已经发现了很少的日食双白矮星,这限制了观测研究.
研究的目的:
- 报道新发现的双白矮星系统.
- 描述它的轨道周期,紧度和引力波发射.
- 评估它在即将到来的LISA任务中被发现的可能性.
主要方法:
- 用光度观测来识别日食并确定轨道周期.
- 进行光谱分析以确认双线性和轨道动态.
- 对轨道衰变进行分析以验证与广义相对论预测的一致性.
主要成果:
- 发现ZTF J153932.16+502738.8,一个日食双白矮星,轨道周期为6.91分钟.
- 该系统呈现出紧的轨道,深度日食和双线光谱特征.
- 观测到的快速轨道衰变与广义相对论对引力波辐射的预测一致.
结论:
- ZTF J153932.16+502738.8是一个独特的,极其紧的二进制系统.
- 它是一个强大的引力辐射源,接近LISA的峰值灵敏度.
- 预计该系统在启动后不久就能被LISA轻松检测到.
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