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arXiv 0808.2292astro-ph
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PSR J1518 +4904的多望远镜定时

Multi-telescope timing of PSR J1518+4904

G. H. Janssen, B. W. Stappers, M. Kramer, D. J. Nice, A. Jessner, I. Cognard, M. B. Purver, .

摘要:

PSR J1518+4904是已知的9个双中子星系统之一。这些系统对于测量中子星的质量、测量引力效应和检验引力理论都是非常有价值的。我们确定了一个温和的相对论性双中子星系统,结合多个望远镜的数据改进的定时解决方案。通过对相对论性参数和分离质量的约束,讨论了PSR J1518+4904在其他双中子星系统中的演化. PSR J1518+4904已经被欧洲脉冲星定时阵列(EPTA)网络使用Westerbork,Jodrell Bank,Effelsberg和Nancay射电望远镜定期观测了10多年。使用更新的计时软件Tempo 2分析数据。我们改进了双中子星系统的计时解。改进了近星点的推进,并提出了一个有意义的自行探测。在不久的将来,不太可能测量出更多的后开普勒参数,用这些参数可以分别确定单个中子星的质量和系统的倾角。使用EPTA合作中提供的高质量数据集的组合,扩展了原始GBT数据,我们将系统中的质量限制为m_p <1.17 msun and m_c>1.55 msun(95.4%置信度),轨道倾角小于47度(99%)。由此我们得出,该系统中的脉冲星可能是迄今为止测得的质量最低的中子星之一。从演化的角度来看,这颗伴星尽管质量很大,但很可能是在一颗电子捕获超新星中形成的。

英文摘要:

PSR J1518+4904 is one of only 9 known double neutron star systems. These systems are highly valuable for measuring the masses of neutron stars, measuring the effects of gravity, and testing gravitational theories. We determine an improved timing solution for a mildly relativistic double neutron star system, combining data from multiple telescopes. We set better constraints on relativistic parameters and the separate masses of the system, and discuss the evolution of PSR J1518+4904 in the context of other double neutron star systems. PSR J1518+4904 has been regularly observed for more than 10 years by the European Pulsar Timing Array (EPTA) network using the Westerbork, Jodrell Bank, Effelsberg and Nancay radio telescopes. The data were analysed using the updated timing software Tempo2. We have improved the timing solution for this double neutron star system. The periastron advance has been refined and a significant detection of proper motion is presented. It is not likely that more post-Keplerian parameters, with which the individual neutron star masses and the inclination angle of the system can be determined separately, can be measured in the near future. Using a combination of the high-quality data sets present in the EPTA collaboration, extended with the original GBT data, we have constrained the masses in the system to m_p<1.17 msun and m_c>1.55 msun (95.4% confidence), and the inclination angle of the orbit to be less than 47 degrees (99%). From this we derive that the pulsar in this system possibly has one of the lowest neutron star masses measured to date. From evolutionary considerations it seems likely that the companion star, despite its high mass, was formed in an electron-capture supernova.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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