论文标题
不稳定的质量从主要序列恒星转移到超大的黑洞和准周期爆发
Unstable Mass Transfer from a Main-Sequence Star to a Supermassive Black Hole and Quasi-Periodic Eruptions
论文作者
论文摘要
我们讨论由低质量（$ m_ \ star \ lyssim 4 \，\ rm m_ \ odot $）组成的系统的形成和演变，主序列明星，绕$ 10^5-10^7 \，\ rm m_ \ rm m_ \ odot $ odot $ $ $ $ （$ e \ of of0.1-0.2 $），在每个折室通道上散布质量。我们认为，由此产生的传质可能是不稳定的，而Roche Lobe溢出最初是由重力波发射驱动的，但随后因响应其质量损失而被恒星的扩张加速，经历了失控的过程。我们表明，这种系统自然是由星系内parsec内的两体重力相遇产生的，其次是引力波循环和最初高度偏心轨道的灵感。我们认为，这种系统可以产生类似于最近识别的X射线瞬变类似于准周期喷发的X射线瞬变类似的耀斑，在几个遥远星系的中心观察到。
We discuss the formation and evolution of systems comprised of a low-mass ($M_\star \lesssim 4 \, \rm M_\odot$) main sequence star, orbiting a $10^5-10^7 \, \rm M_\odot$ supermassive black hole with an orbital period of order $\sim$hours, and a mild eccentricity ($e\approx0.1-0.2$), episodically shedding mass at each pericenter passage. We argue that the resulting mass transfer is likely unstable, with Roche lobe overflow initially driven by gravitational wave emission, but then being accelerated by the star's expansion in response to its mass loss, undergoing a runaway process. We show that such systems are naturally produced by two-body gravitational encounters within the inner parsec of a galaxy, followed by gravitational wave circularization and inspiral from initially highly eccentric orbits. We argue that such systems can produce recurring flares similar to the recently identified class of X-ray transients known as Quasi-Periodic Eruptions, observed at the centers of a few distant galaxies.
