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arXiv 1802.01707astro-ph.HEastro-ph.SRgr-qc
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PALFA发现一颗高相对论性双中子星双星

PALFA Discovery of a Highly Relativistic Double Neutron Star Binary

K. Stovall, P. C. C. Freire, S. Chatterjee, P. B. Demorest, D. R. Lorimer, M. A. McLaughlin, N. Pol, J. van Leeuwen, R. S. Wharton, B. Allen, M. Boyce, A. Brazi… 展开作者

K. Stovall, P. C. C. Freire, S. Chatterjee, P. B. Demorest, D. R. Lorimer, M. A. McLaughlin, N. Pol, J. van Leeuwen, R. S. Wharton, B. Allen, M. Boyce, A. Brazier, K. Caballero, F. Camilo, R. Camuccio, J. M. Cordes, F. Crawford, J. S. Deneva, R. D. Ferdman, J. W. T. Hessels, F. A. Jenet, V. M. Kaspi, B. Knispel, P. Lazarus, R. Lynch, E. Parent, C. Patel, Z. Pleunis, S. M. Ransom, P. Scholz, A. Seymour, X. Siemens, I. H. Stairs, J. Swiggum, W. W. Zhu

摘要:

我们报告的发现和初步后续的双中子星(DNS)系统,PSR J1946 $+$ 2052,与阿雷西博L波段馈电阵列脉冲星(PALFA)的调查。PSR J1946 $+$ 2052是一颗17毫秒的脉冲星,在一个1.88小时偏心($e \, =\, 0.06$)轨道上,有一颗$\gtrsim 1.2 \, M_\odot$伴星。我们已经使用了Jansky超大阵列本地化PSR J1946 $+$ 2052到0.09角秒的精度,使用一个新的相位分仓模式。我们曾在多波长星表中寻找重合源,但没有找到任何对应的源。改进后的位置使得能够测量脉冲星($\dot{P} \, = \, 9\,\pm \, 2 \,\times 10^{-19}$)的自旋周期导数;表面($B_S \, = \, 4 \, \times \, 10^9 \, \rm G$)的小推断磁场强度表明该脉冲星已被回收。这和轨道偏心率导致PSR J1946 $+$ 2052在DNS系统中的结论。在所有已知的DNS系统中,PSR J1946 $+$ 2052有着最短的轨道周期和最短的合并时间,估计为4600万年;届时它将显示出迄今为止发现的任何此类系统中最大的自旋对引力波波形的影响。我们已经测量了这个系统的近星点通过的进展,$\dotω \, = \, 25.6 \, \pm \, 0.3\, °\rm yr^{-1}$,这意味着系统的总质量只有2.50 $\pm$ 0.04 $M_\odot$,因此它是最低质量的DNS系统之一。这个总质量测量值与最小伴星质量相结合,将脉冲星质量限制为$\lesssim 1.3 \, M_\odot$。

英文摘要:

We report the discovery and initial follow-up of a double neutron star (DNS) system, PSR J1946$+$2052, with the Arecibo L-Band Feed Array pulsar (PALFA) survey. PSR J1946$+$2052 is a 17-ms pulsar in a 1.88-hour, eccentric ($e \, =\, 0.06$) orbit with a $\gtrsim 1.2 \, M_\odot$ companion. We have used the Jansky Very Large Array to localize PSR J1946$+$2052 to a precision of 0.09 arcseconds using a new phase binning mode. We have searched multiwavelength catalogs for coincident sources but did not find any counterparts. The improved position enabled a measurement of the spin period derivative of the pulsar ($\dot{P} \, = \, 9\,\pm \, 2 \,\times 10^{-19}$); the small inferred magnetic field strength at the surface ($B_S \, = \, 4 \, \times \, 10^9 \, \rm G$) indicates that this pulsar has been recycled. This and the orbital eccentricity lead to the conclusion that PSR J1946$+$2052 is in a DNS system. Among all known radio pulsars in DNS systems, PSR J1946$+$2052 has the shortest orbital period and the shortest estimated merger timescale, 46 Myr; at that time it will display the largest spin effects on gravitational wave waveforms of any such system discovered to date. We have measured the advance of periastron passage for this system, $\dotω \, = \, 25.6 \, \pm \, 0.3\, °\rm yr^{-1}$, implying a total system mass of only 2.50 $\pm$ 0.04 $M_\odot$, so it is among the lowest mass DNS systems. This total mass measurement combined with the minimum companion mass constrains the pulsar mass to $\lesssim 1.3 \, M_\odot$.

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