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Heat Flux Constraints From Variance Spectra of Pluto and Charon Using Limb Profile Topography
Journal of Geophysical Research: Planets ( IF 4.8 ) Pub Date : 2021-01-11 , DOI: 10.1029/2020je006641
J. W. Conrad 1 , F. Nimmo 1 , R. A. Beyer 2, 3 , C. J. Bierson 4 , P. M. Schenk 5
Affiliation  

We derive a topography data set from images of Pluto and Charon that contain the body edge (i.e., limb profiles) which will help in understanding the comparative history of the binary system. We use the profiles to derive topographic variance spectra and find that while the variance spectrum of Pluto fits a single power law, Charon's spectrum displays a clear breakpoint at ∼150 km wavelength. Assuming the breakpoint is a result of topographic flexure, we find that Charon's elastic thickness must have been 20 ± 10 km during topography formation. A lack of a breakpoint for Pluto sets a minimum elastic thickness for Pluto of 60 km. We use these elastic thickness estimates to calculate a maximum heat flux of ∼13 m Wm−2 on Pluto during and after topography formation. On Charon, however, we find that the heat flux during topography formation was urn:x-wiley:21699097:media:jgre21569:jgre21569-math-0001 m Wm−2. This range of values far exceeds the likely radiogenic heat production and is consistent with either heat released following the Charon‐forming impact event or (more likely) tidal heating during Charon's early history.

中文翻译:

使用肢体轮廓形貌从冥王星和Charon方差谱得到的热通量约束

我们从冥王星和Charon的图像中获取了包含身体边缘(即肢体轮廓)的地形数据集,这将有助于理解二元系统的比较历史。我们使用这些轮廓来得出地形方差谱,发现尽管冥王星的方差谱符合单一幂律,但Charon谱在〜150 km波长处显示出清晰的断点。假设断点是地形弯曲的结果,我们发现Charon在地形形成过程中的弹性厚度必须为20±10 km。缺少冥王星的断点将冥王星的最小弹性厚度设置为60 km。我们使用这些弹性厚度估计来计算约13 m Wm -2的最大热通量在冥王星形成地形期间和之后。然而,在Charon上,我们发现地形形成过程中的热通量为缸:x-wiley:21699097:media:jgre21569:jgre21569-math-0001m Wm -2。这个值的范围远远超过了可能的放射源热产生,并且与在形成Charon的撞击事件后释放的热量或在Charon的早期历史期间(更有可能的)潮汐加热相一致。
更新日期:2021-02-19
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