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arXiv 0905.3899astro-ph.HE
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SDSS J102347 .6+003841:2000-2001年有热盘的毫秒射电脉冲双星

SDSS J102347.6+003841: A Millisecond Radio Pulsar Binary That Had A Hot Disk During 2000-2001

Zhongxiang Wang, Anne M. Archibald, John R. Thorstensen, Victoria M. Kaspi, Duncan R. Lorimer, Ingrid Stairs, Scott M. Ransom

摘要:

Sloan数字巡天(SDSS)源J102347.6+003841是一颗1.69毫秒射电脉冲双星,轨道周期为4.75小时,伴星约为0.2M。在这里,我们详细分析了源的SDSS谱。光谱是在2001年2月1日拍摄的,当时光源处于明亮状态,显示出宽的双峰氢和氦线-与2003年以后看到的G型吸收光谱截然不同。这些谱线与致密主星周围圆盘的辐射一致。我们用一个简单的圆盘模型拟合SDSS连续谱,得到了圆盘的性质,发现从圆盘的外缘到内缘的温度范围为2000- 34000 K。圆盘的内径和外径分别约为10^9和5.7 × 10^10厘米。这些结果进一步强调了该源的独特特征:它可能是一个处于从X射线双星到再循环射电脉冲星过渡末期的系统。盘的质量估计约为10^23 g,其中大部分在最后的盘破裂事件之前由于脉冲星风烧蚀(或者由于螺旋桨效应,如果盘延伸到脉冲星的光圆柱内)而丢失。该系统可能会经历重复的盘形成事件。需要密切监测这个源,以便再次捕捉到系统的明亮状态,这样就可以更详细地研究这个不寻常的脉冲星-盘相互作用的例子

英文摘要:

The Sloan Digital Sky Survey (SDSS) source J102347.6+003841 was recently revealed to be a binary 1.69 millisecond radio pulsar with a 4.75 hr orbital period and a ~0.2 M_sun companion. Here we analyze the SDSS spectrum of the source in detail. The spectrum was taken on 2001 February 1, when the source was in a bright state and showed broad, double-peaked hydrogen and helium lines -- dramatically different from the G-type absorption spectrum seen from 2003 onward. The lines are consistent with emission from a disk around the compact primary. We derive properties of the disk by fitting the SDSS continuum with a simple disk model, and find a temperature range of 2000--34000 K from the outer to inner edge of the disk. The disk inner and outer radii were approximately 10^9 and 5.7x10^10 cm, respectively. These results further emphasize the unique feature of the source: it is likely a system at the end of its transition from an X-ray binary to a recycled radio pulsar. The disk mass is estimated to have been ~10^23 g, most of which would have been lost due to pulsar wind ablation (or due to the propeller effect if the disk had extended inside the light cylinder of the pulsar) before the final disk disruption event. The system could undergo repeated episodes of disk formation. Close monitoring of the source is needed to catch the system in its bright state again, so that this unusual example of a pulsar-disk interaction can be studied in much finer detail

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