论文标题
行星明星互动与精确的过境时机。 iii。进入动态潮汐制度
Planet-star interactions with precise transit timing. III. Entering the regime of dynamical tides
论文作者
论文摘要
非常短的周期轨道上的热木星预计将不稳定潮汐消散和对宿主恒星的螺旋。那是因为它们通过潮汐耗散将轨道运动的角动量传递到恒星内部。尽管这种现象的幅度与特定的星形行星系统的物理特性有关,但统计研究表明,潮汐耗散可能会在主序列上在恒星寿命期间塑造热木星系统的结构。潮汐耗散的效率在星空星体系统中仍受到很大的限制。恒星内部模型表明,辐射区域中动态潮汐的耗散可能是驱动行星轨道衰变的主要机制。这些理论预测可以通过传输时序方法验证。我们为五个行星购买了新的精确过境。以前,它们被确定为可能检测到轨道衰变的最佳候选者。对时序数据的分析使我们能够对轨道衰减率更加严格。对于系统HAT-P-23,KELT-1,KELT-16,WASP-18和WASP-103的系统中,所有五个热木星的轨道周期均未检测到其轨道周期的统计显着变化。对于Planets HAT-P-23 B,WASP-18 B和WASP-103 B,观察结果表明,动态潮汐耗散的机制可能无法在其宿主恒星中运行,从而阻止了它们的快速轨道衰减。这一发现与F型恒星的恒星内部模型保持一致,其中动态潮汐由于对流芯而没有完全阻尼。对于KELT-16 B,过境时序数据的跨度不足以验证理论预测。 Kelt-1 B被确定为研究对流层中惯性波的耗散潮汐相互作用的潜在实验室。
Hot Jupiters on extremely short-period orbits are expected to be unstable to tidal dissipation and spiral toward their host stars. That is because they transfer the angular momentum of the orbital motion through tidal dissipation into the stellar interior. Although the magnitude of this phenomenon is related to the physical properties of a specific star-planet system, statistical studies show that tidal dissipation might shape the architecture of hot Jupiter systems during the stellar lifetime on the main sequence. The efficiency of tidal dissipation remains poorly constrained in star-planet systems. Stellar interior models show that the dissipation of dynamical tides in radiation zones could be the dominant mechanism driving planetary orbital decay. These theoretical predictions can be verified with the transit timing method. We acquired new precise transit mid-times for five planets. They were previously identified as the best candidates for which orbital decay might be detected. Analysis of the timing data allowed us to place tighter constraints on the orbital decay rate. No statistically significant changes in their orbital periods were detected for all five hot Jupiters in systems HAT-P-23, KELT-1, KELT-16, WASP-18, and WASP-103. For planets HAT-P-23 b, WASP-18 b, and WASP-103 b, observations show that the mechanism of the dynamical tides dissipation probably does not operate in their host stars, preventing them from rapid orbital decay. This finding aligns with the models of stellar interiors of F-type stars, in which dynamical tides are not fully damped due to convective cores. For KELT-16 b, the span of transit timing data was not long enough to verify the theoretical predictions. KELT-1 b was identified as a potential laboratory for studying the dissipative tidal interactions of inertial waves in a convective layer.