Emerging Possibilities and Insuperable Limitations of Exogeophysics: The Example of Plate Tectonics
- Creators
- Stamenković, Vlada
- Seager, Sara
Abstract
To understand the evolution and the habitability of any rocky exoplanet demands detailed knowledge about its geophysical state and history—such as predicting the tectonic mode of a planet. Yet no astronomical observation can directly confirm or rule out the occurrence of plate tectonics on a given exoplanet. Moreover, the field of plate tectonics is still young—questioning whether we should study plate tectonics on exoplanets at this point in time. In this work, we determine the limitations and the emerging possibilities of exogeophysics, the science of connecting geophysics to exoplanets, on the example of plate tectonics. Assuming current uncertainties in model and planet parameters, we develop a qualitatively probabilistic and conservative framework to estimate on what kind of planets and where in the Galaxy plate tectonics might occur. This we achieve by modeling how plate yielding, the most critical condition needed for plate mobility and subduction, is affected by directly observable (planet mass, size) or indirectly, to some degree, assessable planet properties (structure and composition). Our framework not only highlights the importance of a planet's chemistry for the existence of plate tectonics and the path toward practical exogeophysics but also demonstrates how exoplanet science can actually help to better understand geophysics and the fundamentals of plate tectonics on Earth itself.
Additional Information
© 2016 The American Astronomical Society. Received 2014 December 2; accepted 2016 March 7; published 2016 July 1. V.S. thanks the Simons Foundation for kindly supporting this work through a "Simons Collaboration on the Origins of Life" fellowship (338555, VS), Adrian Lenardic, Tobias Höink, and Doris Brever for insightful discussions, an anonymous reviewer for comments, and Steinn Sigurdson for his editorial work.Attached Files
Published - apj_825_1_78.pdf
Files
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Additional details
- Eprint ID
- 70702
- Resolver ID
- CaltechAUTHORS:20160930-132359568
- 338555
- Simons Foundation
- Created
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2016-09-30Created from EPrint's datestamp field
- Updated
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2021-11-11Created from EPrint's last_modified field