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arXiv 1809.05064astro-ph.HE
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PSR J2234 +0611:一个新的恒星演化实验室

PSR J2234+0611: A new laboratory for stellar evolution

K. Stovall, P. C. C. Freire, J. Antoniadis, M. Bagchi, J. S. Deneva, N. Garver-Daniels, J. G. Martinez, M. A. McLaughlin, Z. Arzoumanian, H. Blumer, P. R. Brook… 展开作者

K. Stovall, P. C. C. Freire, J. Antoniadis, M. Bagchi, J. S. Deneva, N. Garver-Daniels, J. G. Martinez, M. A. McLaughlin, Z. Arzoumanian, H. Blumer, P. R. Brook, H. T. Cromartie, P. B. Demorest, M. E. Decesar, T. Dolch, J. A. Ellis, R. D. Ferdman, E. C. Ferrara, E. Fonseca, P. A. Gentile, M. L. Jones, M. T. Lam, D. R. Lorimer, R. S. Lynch, C. Ng, D. J. Nice, T. T. Pennucci, S. M. Ransom, R. Spiewak, I. H. Stairs, J. K. Swiggum, S. J. Vigeland, W. W. Zhu

摘要:

我们报告PSR J2234+0611的计时结果,PSR J2234+0611是一颗3.6毫秒脉冲星,在32天的偏心(e = 0.13)轨道上,与一颗氦白矮星伴星一起发现,这是阿雷西博天文台327 MHz漂移扫描调查的一部分。精确的时间和轨道的偏心性质允许精确测量一个不寻常的参数:a)27.10(3)mas/yr的精确自行和1.05(4)mas的视差,导致脉冲星距离为0.95(4)kpc;这允许精确估计横向速度,123(5)km/s。与以前公布的系统径向速度的光谱测量一起,这使得能够对系统的速度进行完整的三维测定; b)对近星点的前进速率进行精确测量,在减去自行的贡献之后,得出系统的总质量为$1.6518^{+0.0033}_{-0.0035}$太阳质量; c)Shapiro延迟测量,h_3 = $82 \pm 14$ ns,尽管轨道倾角不接近90度;结合对总质量的测量,得出脉冲星质量为$1.353^{+0.014}_{-0.017}$太阳质量,伴星质量为$0.298^{+0.015}_{-0.012}$太阳质量; d)我们精确地测量了投影半长轴的长期变化,并检测到显著的年度轨道视差;这些都允许确定完整的三维轨道几何形状,包括明确的轨道倾角(i = $138.7^{+2.5}_{-2.2}$ deg)和节点线的位置角(Ω = $44^{+5}_{-4}$ deg)。我们讨论的组件质量调查假设先前先进的解释偏心MSP的起源。对系统的全三维位置、运动和轨道方向的前所未有的确定,加上精确测量的脉冲星和WD质量以及后者的光学探测,使该系统成为我们对白矮星及其大气层理解的独特测试。

英文摘要:

We report timing results for PSR J2234+0611, a 3.6-ms pulsar in a 32-day, eccentric (e = 0.13) orbit with a helium white dwarf companion discovered as part of the Arecibo Observatory 327 MHz drift scan survey. The precise timing and the eccentric nature of the orbit allow precise measurements of an unusual number of parameters: a) a precise proper motion of 27.10(3) mas/yr and a parallax of 1.05(4) mas resulting in a pulsar distance of 0.95(4) kpc; this allows a precise estimate of the transverse velocity, 123(5) km/s. Together with previously published spectroscopic measurements of the systemic radial velocity, this allows a full 3-D determination of the system's velocity; b) precise measurements of the rate of advance of periastron, which after subtraction of the contribution of the proper motion yields a total system mass of $1.6518^{+0.0033}_{-0.0035}$ solar masses; c) a Shapiro delay measurement, h_3 = $82 \pm 14$ ns despite the orbital inclination not being near 90 deg; combined with the measurement of the total mass, this yields a pulsar mass of $1.353^{+0.014}_{-0.017}$ solar masses and a companion mass of $0.298^{+0.015}_{-0.012}$ solar masses; d) we measure precisely the secular variation of the projected semi-major axis and detect significant annual orbital parallax; together these allow a determination of the full 3-D orbital geometry, including an unambiguous orbital inclination (i = $138.7^{+2.5}_{-2.2}$ deg) and a position angle for the line of nodes (Omega = $44^{+5}_{-4}$ deg). We discuss the component masses to investigate hypotheses previously advanced to explain the origin of eccentric MSPs. The unprecedented determination of the full 3-D position, motion and orbital orientation of the system, plus the precisely measured pulsar and WD mass and the latter's optical detection make this system an unique test of our understanding of white dwarfs and their atmospheres.

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