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arXiv 1812.02438astro-ph.EP
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行星与恒星的相互作用具有精确的transit定时。I. WASP-12 b的精确轨道衰减率和HAT-P-23 b、KELT-1 b、KELT-16 b、WASP-33 b和WASP-103 b的初始约束

Planet-star interactions with precise transit timing. I. The refined orbital decay rate for WASP-12 b and initial constraints for HAT-P-23 b, KELT-1 b, KELT-16 b, WASP-33 b, and WASP-103 b

G. Maciejewski, M. Fernández, F. Aceituno, S. Martín-Ruiz, J. Ohlert, D. Dimitrov, K. Szyszka, C. von Essen, M. Mugrauer, R. Bischoff, K. -U. Michel, M. Mallonn… 展开作者

G. Maciejewski, M. Fernández, F. Aceituno, S. Martín-Ruiz, J. Ohlert, D. Dimitrov, K. Szyszka, C. von Essen, M. Mugrauer, R. Bischoff, K. -U. Michel, M. Mallonn, M. Stangret, D. Moździerski

摘要:

理论计算和一些间接观测表明,在紧密轨道上的大质量系外行星必定会由于其宿主恒星内的潮汐耗散而衰变。这种轨道演变可以通过精确的过境时间在几十年的过程中观测到。行星内旋速率不仅可以帮助我们了解行星系统演化的某些方面,而且可以作为恒星内部结构的探测器。在本文中,我们提出的过境时间运动的结果,精心挑选的样本,发现是最好的候选人,探测行星-恒星潮汐相互作用的北半球的热彗星状行星。其中有WASP-12系统,它是拥有一颗下落的巨型系外行星的最佳候选者。我们的新观测支持WASP-12 b轨道衰变的情况,并使我们能够改进其速率。由此导出的主星潮汐质量参数Q '_{*} =(1.82 +/- 0.32)× 10^5与亚巨星的理论预言一致。对于其余的系统-- HAT-P-23、KELT-1、KELT-16、WASP-33和WASP-103 --我们的凌日时间数据显示与恒定周期模型没有偏差,因此对各个轨道衰变率进行了限制。至少有4个系统(HAT-P-23、KELT-1、WASP-33和WASP-103)的主恒星的潮汐质量参数被发现大于WASP-12的数值。这与发现是一致的,这些主机是主序星,其潮汐耗散的效率预计是相对较弱的。

英文摘要:

Theoretical calculations and some indirect observations show that massive exoplanets on tight orbits must decay due to tidal dissipation within their host stars. This orbital evolution could be observationally accessible through precise transit timing over a course of decades. The rate of planetary in-spiralling may not only help us to understand some aspects of evolution of planetary systems, but also can be used as a probe of the stellar internal structure. In this paper we present results of transit timing campaigns organised for a carefully selected sample of hot Jupiter-like planets which were found to be the best candidates for detecting planet-star tidal interactions on the Northern hemisphere. Among them, there is the WASP-12 system which is the best candidate for possessing an in-falling giant exoplanet. Our new observations support the scenario of orbital decay of WASP-12 b and allow us to refine its rate. The derived tidal quality parameter of the host star Q'_{*} = (1.82 +/- 0.32) x 10^5 is in agreement with theoretical predictions for subgiant stars. For the remaining systems - HAT-P-23, KELT-1, KELT-16, WASP-33, and WASP-103 - our transit timing data reveal no deviations from the constant-period models, hence constraints on the individual rates of orbital decay were placed. The tidal quality parameters of host stars in at least 4 systems - HAT-P-23, KELT-1, WASP-33, and WASP-103 - were found to be greater than the value reported for WASP-12. This is in line with the finding that those hosts are main sequence stars, for which efficiency of tidal dissipation is predicted to be relatively weak.

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