Neutron star-black hole mergers with a nuclear equation of state and neutrino cooling: Dependence in the binary parameters
Neutron star-black hole mergers with a nuclear equation of state and neutrino cooling: Dependence in the binary parameters
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DOI：
10.1103/physrevd.90.024026
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发表时间：
2014-07-10
影响因子：
5
通讯作者：
Szilagyi, Bela
中科院分区：
文献类型：
--
作者：
Foucart, Francois;Deaton, M. Brett;Szilagyi, Bela
我们首次探索了中子星-黑洞合并的结果，利用黑洞质量在最可能的7M（圆点）-10M（圆点）范围内，采用中微子泄漏方案，并通过基于有限温度核理论的状态方程对中子星物质进行了建模。在中子星被潮汐破坏的黑洞旋转范围内（chi（BH）大于或类似于0.7），我们发现合并持续产生大量冷（T小于或类似于1 MeV）、未束缚的、富含中子的物质（M-ej类似于0.05M（圆点）-0.20M（圆点））。相当数量的束缚物质最初分为热盘（T-max类似于15 MeV），典型的中微子光度L-nu类似于10(53)erg/s，以及较冷的潮汐尾。吸积盘经过大约10毫秒的短时间快速质子化后，在尾部冷却物质的回落、最热物质持续吸积到黑洞以及中微子发射的共同作用下，吸积盘冷却下来。随着温度的降低，圆盘逐渐变得中子丰富，中微子发射更暗。一旦磁盘中的粘性加热（不包括在我们的模拟中）平衡冷却，这个冷却过程应该停止。这些中子星-黑洞双星的合并，黑洞质量为M-BH，类似于7M（圆点）-10M（圆点），黑洞旋转高到足以使中子星中断，为产生短伽马射线暴、由于未结合物质的放射性衰变而产生的明亮红外合并后信号和大量r过程核提供了有希望的候选者。
We present a first exploration of the results of neutron star-black hole mergers using black hole masses in the most likely range of 7M(circle dot)-10M(circle dot), a neutrino leakage scheme, and a modeling of the neutron star material through a finite-temperature nuclear-theory based equation of state. In the range of black hole spins in which the neutron star is tidally disrupted (chi(BH) greater than or similar to 0.7), we show that the merger consistently produces large amounts of cool (T less than or similar to 1 MeV), unbound, neutron-rich material (M-ej similar to 0.05M(circle dot)-0.20M(circle dot)). A comparable amount of bound matter is initially divided between a hot disk (T-max similar to 15 MeV) with typical neutrino luminosity of L-nu similar to 10(53) erg/s, and a cooler tidal tail. After a short period of rapid protonization of the disk lasting similar to 10 ms, the accretion disk cools down under the combined effects of the fall-back of cool material from the tail, continued accretion of the hottest material onto the black hole, and neutrino emission. As the temperature decreases, the disk progressively becomes more neutron rich, with dimmer neutrino emission. This cooling process should stop once the viscous heating in the disk (not included in our simulations) balances the cooling. These mergers of neutron star-black hole binaries with black hole masses of M-BH similar to 7M(circle dot)-10M(circle dot), and black hole spins high enough for the neutron star to disrupt provide promising candidates for the production of short gamma-ray bursts, of bright infrared postmerger signals due to the radioactive decay of unbound material, and of large amounts of r-process nuclei.