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arXiv 1903.09211astro-ph.HE
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PSR J1306 --40:一个X射线发光的红背与一个进化的伴侣

PSR J1306--40: An X-ray Luminous Redback with an Evolved Companion

Samuel J. Swihart, Jay Strader, Laura Chomiuk, Laura Shishkovsky

摘要:

PSR J1306- 40是一颗毫秒脉冲星双星,它有一颗非简并伴星,在一个异常长的$\sim$ 1.097天轨道上运行。我们提出了新的光学光度学和光谱学的这个系统,并对这些数据进行建模,以约束二进制的基本属性,如组件的质量和距离。光学数据表明,中子星的最小质量为$1.75\pm0.09\,M_{\odot}$(1-sigma),倾角很高,接近边缘。光变曲线表明伴星上有一个大的热点,这表明一部分脉冲星风被次级恒星的磁场引导到恒星表面,并通过双星内的激波传播。的H $α$线配置文件迅速切换从发射到吸收附近的同伴下结合,符合日食的紧凑的发射区在这些阶段。在我们光学推断的$4.7\pm0.5$ kpc距离处,X射线光度为$\sim$ 10 $^{33}$ erg s $^{\textrm{-1}}$,比几乎所有已知的脉冲星状态下的红背星都要亮。长周期,subgiant-like二次和发光的X射线发射表明,该系统可能是扩展类毫秒脉冲双星的一部分,是典型的场脉冲星-白矮星双星的祖先。

英文摘要:

PSR J1306--40 is a millisecond pulsar binary with a non-degenerate companion in an unusually long $\sim$1.097 day orbit. We present new optical photometry and spectroscopy of this system, and model these data to constrain fundamental properties of the binary such as the component masses and distance. The optical data imply a minimum neutron star mass of $1.75\pm0.09\,M_{\odot}$ (1-sigma) and a high, nearly edge-on inclination. The light curves suggest a large hot spot on the companion, suggestive of a portion of the pulsar wind being channeled to the stellar surface by the magnetic field of the secondary, mediated via an intrabinary shock. The H$α$ line profiles switch rapidly from emission to absorption near companion inferior conjunction, consistent with an eclipse of the compact emission region at these phases. At our optically-inferred distance of $4.7\pm0.5$ kpc, the X-ray luminosity is $\sim$10$^{33}$ erg s$^{\textrm{-1}}$, brighter than nearly all known redbacks in the pulsar state. The long period, subgiant-like secondary, and luminous X-ray emission suggest this system may be part of the expanding class of millisecond pulsar binaries that are progenitors to typical field pulsar--white dwarf binaries.

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