论文标题
通过PULSAR到达时间分析揭示脉冲星 - 二进制黑洞三重系统的结构
Unveiling the architecture of a pulsar - binary black-hole triple system with pulsar arrival time analysis
论文作者
论文摘要
由于最近用重力波（GW）检测器发现的BBH合并的祖细胞，因此存在大量具有较长轨道周期的二元黑洞（BBH）。在以前的论文中，我们建议通过第三级轨道恒星的径向速度调制在三个系统中搜索此类BBH。如果第三纪是脉冲星，则对其到达时间的高精度和节奏的观察可以使脉冲星的明确表征 - 位于几个kpc的BBH三元组，与恒星的径向速度无法访问。 The present paper shows that such inner BBHs can be identified through the short-term Rømer delay modulation, on the order of $10$ msec for our fiducial case, a triple consisting of $20~M_\odot$ BBH and $1.4~M_\odot$ pulsar with $P_\mathrm{in}=10$ days and $P_\mathrm{out}=100$ days.如果还测量了相对论时间延迟，则可以从基本上确定三重的所有轨道参数。例如，如果三级脉冲星的轨道周期约为几天，则此方法适用于$ \ sim 1 $ hr轨道周期的内部BBH。带有$ \ lyssim 1 $ HR轨道周期的内部BBH散发出丽莎，Decigo和BBO在内的未来空间GW任务，以及具有次秒轨道时期的非常短的内BBH，甚至可以由现有的基于地面的GW检测器探测。因此，我们提出的方法提供了一种互补的技术，可以在不久的将来搜索三元组（如果有的话）。
A large number of binary black holes (BBHs) with longer orbital periods are supposed to exist as progenitors of BBH mergers recently discovered with gravitational wave (GW) detectors. In our previous papers, we proposed to search for such BBHs in triple systems through the radial-velocity modulation of the tertiary orbiting star. If the tertiary is a pulsar, high precision and cadence observations of its arrival time enable an unambiguous characterization of the pulsar -- BBH triples located at several kpc, which are inaccessible with the radial velocity of stars. The present paper shows that such inner BBHs can be identified through the short-term Rømer delay modulation, on the order of $10$ msec for our fiducial case, a triple consisting of $20~M_\odot$ BBH and $1.4~M_\odot$ pulsar with $P_\mathrm{in}=10$ days and $P_\mathrm{out}=100$ days. If the relativistic time delays are measured as well, one can determine basically all the orbital parameters of the triple. For instance, this method is applicable to inner BBHs of down to $\sim 1$ hr orbital periods if the orbital period of the tertiary pulsar is around several days. Inner BBHs with $\lesssim 1$ hr orbital period emit the GW detectable by future space-based GW missions including LISA, DECIGO, and BBO, and very short inner BBHs with sub-second orbital period can be even probed by the existing ground-based GW detectors. Therefore, our proposed methodology provides a complementary technique to search for inner BBHs in triples, if exist at all, in the near future.
