轨道周期最短的黑洞双星--MAXI J1659-152
MAXI J1659-152: the shortest orbital period black-hole binary
摘要：
在探测到一个明亮的新X射线源MAXI J1659-152之后，几乎所有目前正在飞行的高能任务都引发了一系列观测。我们在这里报告的XMM-牛顿，积分和RXTE观测在这个瞬态黑洞候选人的X射线爆发的早期阶段。我们证实了浸渍性质的X射线光变曲线。我们发现，下降的周期为2.4139+/-0.0005小时，并解释为系统的轨道周期。因此，它是迄今为止已知的周期最短的黑洞X射线双星。利用各种观测量，我们推导出源的性质。吸积盘相对于视线的倾角估计为60-75度。该黑洞的伴星可能是一颗M5矮星，质量和半径分别约为0.15 M_sun和0.23 R_sun。该系统相当紧凑（轨道间距约为1.35 R_sun），距离约为7 kpc。在静止时，MAXI J1659-152的光学亮度较暗，在V波段约为28等。
英文摘要：
Following the detection of a bright new X-ray source, MAXI J1659-152, a series of observations was triggered with almost all currently flying high-energy missions. We report here on XMM-Newton, INTEGRAL and RXTE observations during the early phase of the X-ray outburst of this transient black-hole candidate. We confirm the dipping nature in the X-ray light curves. We find that the dips recur on a period of 2.4139+/-0.0005 hrs, and interpret this as the orbital period of the system. It is thus the shortest period black-hole X-ray binary known to date. Using the various observables, we derive the properties of the source. The inclination of the accretion disk with respect to the line of sight is estimated to be 60-75 degrees. The companion star to the black hole is possibly a M5 dwarf star, with a mass and radius of about 0.15 M_sun and 0.23 R_sun, respectively. The system is rather compact (orbital separation is about 1.35 R_sun) and is located at a distance of roughly 7 kpc. In quiescence, MAXI J1659-152 is expected to be optically faint, about 28 mag in the V-band.
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