论文标题
持续寻找热木星潮汐轨道衰变的证据
The continuing search for evidence of tidal orbital decay of hot Jupiters
论文作者
论文摘要
许多已知的热木星对潮汐轨道衰变正式不稳定。直接检测到轨道衰减的唯一热木星是WASP-12，跨越十年以上的过境时机测量结果表明，轨道周期的速度正在以$ dp/dt \ dp/dt \ 10^{ - 9} $的速度下降，与降低的潮流质量降低了约$ 2 \ $ 2 \ $ 2 \ tiles 10^5 $。在这里，我们提出了WASP-12和其他11个系统的传输数据汇编，这些数据特别有利于检测轨道衰减：KELT-16； WASP-18、19、43、72、103、114和122; HAT-P-23; Hats-18;和Ogle-Tr-56。对于大多数这些系统，我们提供的新数据扩展了已经执行观测值的时间基线。除WASP-12外，所有系统都没有显示有关周期变化的令人信服的证据，其典型的上限为$ dp/dt $，订单为$ 10^{ - 9} $或$ 10^{ - 10} $，以及降低的潮汐质量因子的下限$ 10^5 $。 WASP-19是一个可能的例外，它显示出具有统计学意义的趋势，尽管这可能是星形活动的虚假效果。鼓励进一步的观察。
Many of the known hot Jupiters are formally unstable to tidal orbital decay. The only hot Jupiter for which orbital decay has been directly detected is WASP-12, for which transit timing measurements spanning more than a decade have revealed that the orbital period is decreasing at a rate of $dP/dt\approx 10^{-9}$, corresponding to a reduced tidal quality factor of about $2\times 10^5$. Here, we present a compilation of transit-timing data for WASP-12 and eleven other systems which are especially favorable for detecting orbital decay: KELT-16; WASP-18, 19, 43, 72, 103, 114, and 122; HAT-P-23; HATS-18; and OGLE-TR-56. For most of these systems we present new data that extend the time baseline over which observations have been performed. None of the systems besides WASP-12 displays convincing evidence for period changes, with typical upper limits on $dP/dt$ on the order of $10^{-9}$ or $10^{-10}$, and lower limits on the reduced tidal quality factor on the order of $10^5$. One possible exception is WASP-19, which shows a statistically significant trend, although it may be a spurious effect of starspot activity. Further observations are encouraged.
