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arXiv 1507.07710astro-ph.HE
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PSR J102347 .6+003841?

Roche Lobe Underfilling of the Secondary Star in PSR J102347.6+003841?

O. McConnell, P. J. Callanan, M. Kennedy, D. Hurley, P. Garnavich, J. Menzies

摘要:

PSR J102347.6+003841是一颗射电脉冲星,自转周期为1.69毫秒,轨道周期为4.75小时。独特的是,它经历了来自伴星的短暂吸积:它在从X射线双星到孤立毫秒射电脉冲星的演化轨迹中占据重要地位。在这里,我们提出了一个光谱研究,该系统显示晚型吸收功能相匹配的G2V星。我们发现半振幅为$286 \pm 3$ kms $^{-1}$,最佳拟合轨道周期为0.1980966(1)天。我们将这些测量与光学测光相结合,这表明第二颗星可能在15%到20%之间未填满其洛希瓣。我们在2 $σ$水平上弱约束中子星的质量为$\leq$ 2.2 M $_\odot$。我们还讨论了在我们的模板减去,平均光谱的H $α$发射线的可能来源。最后,我们提出并讨论了新的光学测光的J1023在最近爆发的系统。

英文摘要:

PSR J102347.6+003841 is a radio pulsar system with a spin period of 1.69 ms and an orbital period of 4.75 hours. Uniquely, it undergoes periods of transient accretion from its companion star: it occupies an important position in the evolutionary track from X-ray binary to isolated millisecond radio pulsar. Here we present a spectroscopic study of this system showing late-type absorption features which match those of a G2V star. We find a semiamplitude of $286 \pm 3$ kms$^{-1}$ and a best fit orbital period of 0.1980966(1) days. We combine these measurements with optical photometry which suggests the secondary star may be underfilling its Roche lobe by between 15\% and 20\%. We weakly constrain the mass of the neutron star to be $\leq$ 2.2 M$_\odot$ at the 2$σ$ level. We also discuss the possible origins of the H$α$ emission line in our template subtracted, averaged spectrum. Finally we present and discuss new optical photometry of J1023 taken during the recent outburst of the system.

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