Searching for ocean formation probability proxies in exoplanet databases – an astrogeological approach

Abstract

Finding planetary bodies in the Solar system and beyond, with surface or subsurface oceans, which may harbor life, is one of the main goals of planetary studies. As a result of this search, an exponentially growing number of exoplanets have been discovered lately, which provides us with a unique opportunity to build and test new theories. Here, we introduce the Extraterrestrial Oceanography (ExTerrO) framework, and its focuses, such as the evaluation of the parameters, found in the exoplanet dataset(s), from a comparative astrogeological point of view, including, i) the influence of those parameters in surface ocean formation, and ii) their possible role as surface ocean proxy, standing individually or as a part of a more complex index. The theory behind the research considers that the more of the parameters applicable to an exoplanet with some divergence from known and well-examined “pilot planetary bodies” with surface oceans, the greater the possibility of surface ocean formation. Based on the preliminary results of the framework, orbital parameters, such as eccentricity and semi-major axis, and the planetary mass affect ocean formation-related processes the most and are potential candidates as future ocean formation probability proxies individually and/or as a part of more complex indices.