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The fate of ethane in Titan’s hydrocarbon lakes and seas

By SpaceRef Editor
October 28, 2015
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The fate of ethane in Titan’s hydrocarbon lakes and seas

Olivier Mousis, Jonathan I. Lunine, Alexander G. Hayes, Jason D. Hofgartner
(Submitted on 26 Oct 2015)

Ethane is expected to be the dominant photochemical product on Titan’s surface and, in the absence of a process that sequesters it from exposed surface reservoirs, a major constituent of its lakes and seas. Absorption of Cassini’s 2.2 cm radar by Ligeia Mare however suggests that this north polar sea is dominated by methane. In order to explain this apparent ethane deficiency, we explore the possibility that Ligeia Mare is the visible part of an alkanofer that interacted with an underlying clathrate layer and investigate the influence of this interaction on an assumed initial ethane-methane mixture in the liquid phase. We find that progressive liquid entrapment in clathrate allows the surface liquid reservoir to become methane-dominated for any initial ethane mole fraction below 0.75. If interactions between alkanofers and clathrates are common on Titan, this should lead to the emergence of many methane-dominated seas or lakes.

Comments: Accepted for publication in Icarus
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:1510.07677 [astro-ph.EP] (or arXiv:1510.07677v1 [astro-ph.EP] for this version)
Submission history
From: Olivier Mousis
[v1] Mon, 26 Oct 2015 20:54:39 GMT (1231kb,D)

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