arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1712.04445astro-ph.HEastro-ph.SR
收藏

PSR J2322 $-$ 2650 --一颗低光度毫秒脉冲星,伴有行星质量伴星

PSR J2322$-$2650 -- A low-luminosity millisecond pulsar with a planetary-mass companion

R. Spiewak, M. Bailes, E. D. Barr, N. D. R. Bhat, M. Burgay, A. D. Cameron, D. J. Champion, C. M. L. Flynn, A. Jameson, S. Johnston, M. J. Keith, M. Kramer, S. … 展开作者

R. Spiewak, M. Bailes, E. D. Barr, N. D. R. Bhat, M. Burgay, A. D. Cameron, D. J. Champion, C. M. L. Flynn, A. Jameson, S. Johnston, M. J. Keith, M. Kramer, S. R. Kulkarni, L. Levin, A. G. Lyne, V. Morello, C. Ng, A. Possenti, V. Ravi, B. W. Stappers, W. van Straten, C. Tiburzi

摘要:

本文介绍了在高时间分辨率宇宙巡天南段发现的一颗双星毫秒脉冲星(MSP)PSR J2322 $-$ 2650。该系统包含一颗3.5毫秒的脉冲星和一颗$\sim10^{-3}$ M $_{\odot}$伴星,它们在7.75小时的圆形轨道上运行。在帕克斯和洛弗尔望远镜的后续观测已经导致了天体测量和自旋参数的精确测量,包括周期导数,时间视差和自行。PSR J2322 $-$ 2650的视差为$4.4\pm1.2$ mas,因此推断距离为$230^{+90}_{-50}$ pc,使该系统成为光学研究的候选系统。我们已经用凯克望远镜在一个$R$波段的观测中,在射电位置探测到了一个$R\approx26.4$等的源,这与我们所期望的伴星的黑体温度是一致的,如果它充满了它的洛希瓣的话。PSR J2322 $-$ 2650的固有周期导数是已知的最低值之一,$4.4(4)\times10^{-22}$ s s $^{-1}$,这意味着低表面磁场强度,$4.0(4)\times10^7$ G。它的平均射电通量密度为160 $μ$ Jy,加上距离意味着它的射电光度是有史以来测量到的最低的,$0.008(5)$ mJy kpc $^2$。银河系中这些系统的推断人口可能是非常重要的,这表明这是一个共同的MSP进化路径。

英文摘要:

We present the discovery of a binary millisecond pulsar (MSP), PSR J2322$-$2650, found in the Southern section of the High Time Resolution Universe survey. This system contains a 3.5-ms pulsar with a $\sim10^{-3}$ M$_{\odot}$ companion in a 7.75-hour circular orbit. Follow-up observations at the Parkes and Lovell telescopes have led to precise measurements of the astrometric and spin parameters, including the period derivative, timing parallax, and proper motion. PSR J2322$-$2650 has a parallax of $4.4\pm1.2$ mas, and is thus at an inferred distance of $230^{+90}_{-50}$ pc, making this system a candidate for optical studies. We have detected a source of $R\approx26.4$ mag at the radio position in a single $R$-band observation with the Keck Telescope, and this is consistent with the blackbody temperature we would expect from the companion if it fills its Roche lobe. The intrinsic period derivative of PSR J2322$-$2650 is among the lowest known, $4.4(4)\times10^{-22}$ s s$^{-1}$, implying a low surface magnetic field strength, $4.0(4)\times10^7$ G. Its mean radio flux density of 160 $μ$Jy combined with the distance implies that its radio luminosity is the lowest ever measured, $0.008(5)$ mJy kpc$^2$. The inferred population of these systems in the Galaxy may be very significant, suggesting that this is a common MSP evolutionary path.

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。

↑