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Constraining tidal dissipation in F-type main-sequence stars: the case of CoRoT-11

机译:限制F型主序星的潮汐耗散:以CoRoT-11为例

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Context. Tidal dissipation in late-type stars is presently poorly understood and the study of planetary systems hosting hot Jupiters can provide new observational constraints to test proposed theories. Aims. We focus on systems with F-type main-sequence stars and find that the recently discovered system CoRoT-11 is presently the best suited for this kind of investigation. Methods. A classic constant tidal lag model is applied to reproduce the evolution of the system from a plausible nearly synchronous state on the zero-age main sequence (ZAMS) to the present state, thus putting constraints on the average modified tidal quality factor of its F6V star.Initial conditions with the stellar rotation period longer than the orbital period of the planet can be excluded on the basis of the presently observed state in which the star spins faster than the planet orbit. Results. It is found that , if the system started its evolution on the ZAMS close to synchronization, with an uncertainty related to the constant tidal lag hypothesis and the estimated stellar magnetic braking within a factor of ?≈5–6.For a non-synchronous initial state of the system, implies an age younger than ?~1?Gyr, while may be tested by comparing the theoretically derived initial orbital and stellar rotation periods with those of a sample of observed systems. Moreover, we discuss how the present value of can be measured by a timing of the mid-epoch and duration of the transits as well as of the planetary eclipses to be observed in the infrared with an accuracy of ?~0.5–1?s over a time baseline of ?~25?yr. Conclusions. CoRoT-11 is a highly interesting system that potentially allows us a direct measure of the tidal dissipation in an F-type star as well as the detection of the precession of the orbital plane of the planet that provides us with an accurate upper limit for the obliquity of the stellar equator. If the planetary orbit has a significant eccentricity (), it will be possible to also detect the precession of the line of the apsides and derive information on the Love number of the planet and its tidal quality factor.
机译:上下文。目前尚不了解晚期型恒星的潮汐消散,对装有炽热木星的行星系统的研究可以提供新的观测约束,以检验提出的理论。目的我们专注于具有F型主序星的系统,发现最近发现的系统CoRoT-11目前最适合此类研究。方法。应用经典的恒定潮汐滞后模型来重现系统从零年龄主序列(ZAMS)上可能的近似同步状态到当前状态的演化过程,从而对其F6V星的平均修正潮汐品质因数施加约束根据目前观察到的恒星自转速度快于行星轨道的状态,可以排除恒星自转周期长于行星轨道周期的初始条件。结果。结果发现,如果系统在ZAMS上开始接近同步的演化,则与恒定潮汐滞后假设和估计的恒星电磁制动相关的不确定性在≈≈5-6的范围内。系统的状态,意味着年龄小于?1?Gyr,同时可以通过将理论推导的初始轨道和恒星自转周期与观察到的系统样本进行比较来进行测试。此外,我们讨论了如何通过在红外中观测到的中历时和中转时间以及行星食的时间来测量的现值,精度为?〜0.5-1?s。时间基准为~~ 25?yr。结论。 CoRoT-11是一个非常有趣的系统,它可能使我们能够直接测量F型恒星的潮汐耗散,并能够检测到行星轨道平面的进动,从而为我们提供了一个精确的上限。恒星赤道的倾斜。如果行星轨道具有明显的偏心率(),则也有可能检测出近地点线的进动,并得出有关该行星的洛夫数及其潮汐品质因数的信息。

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