arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.02825astro-ph.EP
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用月球潮汐为伽利略卫星提供动力

Powering the Galilean Satellites with Moon-Moon Tides

Hamish C. F. C. Hay, Antony Trinh, Isamu Matsuyama

摘要:

有令人信服的证据表明,在伽利略的三个外卫星之间存在着地下水海洋,并且有证据表明,在最里面的卫星木卫一存在着内部岩浆海洋。来自木星的潮汐力周期性地使这些天体变形,导致加热和变形,如果测量的话,可以探测它们的内部结构。除了月球引起的潮汐,每个月亮也会引起其他月亮的潮汐。我们调查月球月球潮汐的第一次在伽利略卫星,并表明,他们可以通过激发高频共振潮汐波在其地下海洋显着加热。地壳和海洋都有加热作用,如果海洋足够无粘性,加热作用可以超过其他潮汐源和辐射衰变。由此产生的潮汐变形可以用来限制地下海洋厚度。因此,我们对木星系统的热轨道演化和可居住性的理解可能会从根本上改变。

英文摘要:

There is compelling evidence for subsurface water oceans among the three outer Galilean satellites, and evidence for an internal magma ocean in the innermost moon, Io. Tidal forces from Jupiter periodically deform these bodies, causing heating and deformation that, if measured, can probe their interior structures. In addition to Jupiter-raised tides, each moon also raises tides on the others. We investigate moon-moon tides for the first time in the Galilean moons, and show that they can cause significant heating through the excitation of high-frequency resonant tidal waves in their subsurface oceans. The heating occurs both in the crust and ocean, and can exceed that of other tidal sources and radiogenic decay if the ocean is inviscid enough. The resulting tidal deformation can be used to constrain subsurface ocean thickness. Our understanding of the thermal-orbital evolution and habitability of the Jovian system may be fundamentally altered as a result.

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