论文标题
开普勒第一个行星系统的可能潮汐消亡
The Possible Tidal Demise of Kepler's First Planetary System
论文作者
论文摘要
我们在开普勒1658（KOI-4）系统中提供了潮汐驱动的灵感的证据，该系统由一个巨大的行星组成（1.1 $ r_ \ r_ \ mathrm {j} $，5.9 $ m_ \ mathrm {j} $）绕过进化的主机（2.9 $ r_ \ odot $ $ $ $，1.5 $ _ $）。使用Kepler，Palomar/Wirc和Tess的过境时序测量值，我们表明Kepler-1658b的轨道周期似乎以$ \ dot {p} = 131 _ { - 22}} = 131 _ { - 22}^{+20}^{+20}} $ p/\ dot {p} \大约2.5 $ 〜myr。我们考虑有关数据在内的其他解释，包括视线加速度和轨道进动，但发现它们是不可信的。观察到的时期衍生物意味着潮汐质量因子$ q_ \ star'= 2.50 _ { - 0.62}^{+0.85} \ times10^4 $，与次级恒星中惯性波消散的理论预测非常吻合。此外，尽管它可能无法解释整个灵感速率，但少量的行星耗散可以自然可以通过增强的热发射来解释对行星观察到的深度日食。作为第一个具有检测到Inspiral的进化系统，Kepler-1658是在行星生命周期结束时了解潮汐物理学的新基准。
We present evidence of tidally-driven inspiral in the Kepler-1658 (KOI-4) system, which consists of a giant planet (1.1$R_\mathrm{J}$, 5.9$M_\mathrm{J}$) orbiting an evolved host star (2.9$R_\odot$, 1.5$M_\odot$). Using transit timing measurements from Kepler, Palomar/WIRC, and TESS, we show that the orbital period of Kepler-1658b appears to be decreasing at a rate $\dot{P} = 131_{-22}^{+20}$~ms~yr$^{-1}$, corresponding to an infall timescale $P/\dot{P}\approx2.5$~Myr. We consider other explanations for the data including line-of-sight acceleration and orbital precession, but find them to be implausible. The observed period derivative implies a tidal quality factor $Q_\star' = 2.50_{-0.62}^{+0.85}\times10^4$, in good agreement with theoretical predictions for inertial wave dissipation in subgiant stars. Additionally, while it probably cannot explain the entire inspiral rate, a small amount of planetary dissipation could naturally explain the deep optical eclipse observed for the planet via enhanced thermal emission. As the first evolved system with detected inspiral, Kepler-1658 is a new benchmark for understanding tidal physics at the end of the planetary life cycle.
