斯普特尼克平原的重新定向暗示冥王星存在地下海洋
地球与行星天体物理
2021-09-06 v1
摘要
冥王星上被深厚氮冰覆盖的斯普特尼克平原（SP；非正式名称）盆地位于非常接近冥王星潮汐轴经度的位置[1]，并且通过与太阳系中其他大型盆地的类比，可能是一个撞击特征[2,3,4]。由潮汐和自转力矩引起的重新定向[5-7]可以解释 SP 的位置，但这要求它是一个正重力异常[7]，尽管其地形为负。本文我们认为，如果 SP 通过撞击形成且冥王星拥有地下海洋，则由于壳层减薄和海洋隆起，随后再有适度的 N2 沉积，正重力异常将自然产生。若无地下海洋，正重力异常将要求厚得难以置信的 N2 层（大于 40 km）。需要刚性的、传导性的冰壳来使此类海洋的寿命延续至今[8]并维持海洋隆起。由于 N2 沉积具有纬度依赖性[9]，氮加载与重新定向可能表现出复杂的反馈[7]。
引用
@article{arxiv.1903.05574,
title = {Reorientation of Sputnik Planitia implies a Subsurface Ocean on Pluto},
author = {F. Nimmo and D. P. Hamilton and W. B. McKinnon P. M. Schenk and R. P. Binzel and C. J. Bierson and R. A. Beyer and J. M. Moore and S. A. Stern and H. A. Weaver and C. Olkin and L. A. Young and K. E. Smith and J. R. Spencer and M. Buie and B. Buratti and A. Cheng and D. Cruikshank and C. Dalle Ore and A. Earle and R. Gladstone and W. Grundy and A. D. Howard and T. Lauer and I. Linscott and J. Parker and S. Porter and H. Reitsema and D. Reuter and J. H. Roberts and S. Robbins and M. Showalter and K. Singer and D. Strobel and M. Summers and L. Tyler and H. Weaver and O. L. White and O. M. Umurhan and M. Banks and O. Barnouin and V. Bray and B. Carcich and A. Chaikin and C. Chavez and C. Conrad and C. Howett and J. Hofgartner and J. Kammer and C. Lisse and A. Marcotte and A. Parker and K. Retherford and M. Saina and K. Runyon and R. Schindhelm and J. Stansberry and A. Steffl and T. Stryk and . H. Throop and C. Tsang and A. Verbiscer and H. Winters and A. Zangari},
journal= {arXiv preprint arXiv:1903.05574},
year = {2021}
}