论文标题
ZTF J153932.16+502738.8-A引力来源接近Lisa敏感性的引力来源的可能形成场景
Possible Formation Scenarios of ZTF J153932.16+502738.8-A Gravitational Source Close to the Peak of LISA's Sensitivity
论文作者
论文摘要
ZTF J153932.16+502738.8（ZTFJ1539）是一种黯然失色的双白锯系统，轨道周期为6.91分钟，是LISA检测重力波的重要来源。但是，质量约为0.61 m $ _ \ odot $的巨大白色矮人（WD）的有效温度很高（48900 K），质量为0.21 m $ _ {\ odot} $的较低质量WD的有效温度较低（$ <$ 10000 K）。它挑战了流行的二元进化论。我们通过Nova和Algol方案研究了ZTFJ1539的形成。假设ZTFJ1539中的大规模WD刚刚经历热核失控，Nova场景可以解释ZTFJ1539中两个WD的有效温度。但是，为了扩大大约4 --- 5分钟的半独立轨道，到约7分钟的独立轨道，Nova场景需要大约200 km S $^{ - 1} $的高踢速度。高踢速度可能导致高偏心率约为0.2 --- 0.6。如果我们采用高效参数来弹出共同的包膜并通过潮汐效应通过恒星风扳机提高质量损失率，则Algol方案也可以产生ZTFJ1539。
ZTF J153932.16+502738.8 (ZTFJ1539) is an eclipsing double-white-dwarf system with an orbital period of 6.91 minutes, and is a significant source of LISA detecting gravitational wave. However, the massive white dwarf (WD) with mass of about 0.61 M$_\odot$ has a high effective temperature (48900 K), and the lower mass WD with mass of about 0.21 M$_{\odot}$ has a low effective temperature($<$10000 K). It is challenging the popular theory of binary evolution. We investigate the formation of ZTFJ1539 via nova and Algol scenarios. Assuming that the massive WD in ZTFJ1539 just experiences a thermalnuclear runaway, nova scenario can explain the effective temperatures of two WDs in ZTFJ1539. However, in order to enlarging a semi-detached orbit of about 4---5 minutes to a detached orbit of about 7 minutes, nova scenario needs a much high kick velocity of about 200 km s$^{-1}$ during nova eruption. The high kick velocity can result in high eccentricity of about 0.2---0.6. Algol scenario can also produce ZTFJ1539 if we take a high efficient parameter for ejecting common envelope and enhance the mass-loss rate via stellar wind trigger by tidal effect.
