THE NANOGRAV NINE-YEAR DATA SET: MASS AND GEOMETRIC MEASUREMENTS OF BINARY MILLISECOND PULSARS
THE NANOGRAV NINE-YEAR DATA SET: MASS AND GEOMETRIC MEASUREMENTS OF BINARY MILLISECOND PULSARS
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DOI：
10.3847/0004-637x/832/2/167
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
E. Fonseca;T. Pennucci;J. Ellis;I. Stairs;D. Nice;S. Ransom;P. Demorest;Z. Arzoumanian;K. Crowter-K
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文献类型：
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作者：
E. Fonseca;T. Pennucci;J. Ellis;I. Stairs;D. Nice;S. Ransom;P. Demorest;Z. Arzoumanian;K. Crowter-K
我们分析了北美纳赫兹天文台的24颗双星射电脉冲星引力波(NANOGrav)的九年数据集。我们对夏皮罗延迟进行了14次重要的测量，包括在四个脉冲星-双星系统(PSR J0613MSP0200、J2017+0603、J302+4442和J2317+1439)中的新探测，并得出了这些−-双星系统的双星质量和轨道倾角的估计。我们发现了大范围的双星脉冲星质量，低至PSRJ1918−0642，高至PSRJ1614−2230(两者的可信度均为68.3%)。我们对PSRJ1918−0642和J2043+1711系统的夏皮罗计时延迟进行了改进，首次测量了后者的脉冲星质量(可信度为68.3%)。我们测量许多系统中一个或多个轨道元素的长期变化，并使用这些测量来进一步限制我们对脉冲星及其伴星质量的估计。特别是，我们利用在PSR J1903+0327系统中观测到的相对论引力引起的Shapiro延迟和近星推进，得出了一个可信度为68.3%的脉冲星质量。我们讨论了我们的质量测量对整个中子星质量分布的影响，以及由于延长的质量转移而对“质量/轨道周期”关联的影响。
We analyze 24 binary radio pulsars in the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) nine-year data set. We make 14 significant measurements of the Shapiro delay, including new detections in four pulsar-binary systems (PSRs J0613−0200, J2017+0603, J2302+4442, and J2317+1439), and derive estimates of the binary-component masses and orbital inclination for these MSP-binary systems. We find a wide range of binary pulsar masses, with values as low as for PSR J1918−0642 and as high as for PSR J1614−2230 (both 68.3% credibility). We make an improved measurement of the Shapiro timing delay in the PSR J1918−0642 and J2043+1711 systems, measuring the pulsar mass in the latter system to be (68.3% credibility) for the first time. We measure secular variations of one or more orbital elements in many systems, and use these measurements to further constrain our estimates of the pulsar and companion masses whenever possible. In particular, we used the observed Shapiro delay and periastron advance due to relativistic gravity in the PSR J1903+0327 system to derive a pulsar mass of (68.3% credibility). We discuss the implications that our mass measurements have on the overall neutron-star mass distribution, and on the “mass/orbital-period” correlation due to extended mass transfer.