There may be more habitable exoplanets than we previously thought, according to Pennsylvania State University researchers Bradford Foley and Andrew Smye, who suggest that plate tectonics are in fact not necessary. Their work is published in the journal Astrobiology.
An artist’s impression of a potentially habitable exoplanet. Image credit: Sci-News.com.
Plate tectonics is the most fundamental process governing the Earth, responsible for the observed patterns of seismicity and volcanism.
“Volcanism releases gases into the atmosphere, and then through weathering, carbon dioxide is pulled from the atmosphere and sequestered into surface rocks and sediment,” Dr. Foley said.
“Balancing those two processes keeps carbon dioxide at a certain level in the atmosphere, which is really important for whether the climate stays temperate and suitable for life.”
Most of Earth’s volcanoes are found at the border of tectonic plates, which is one reason scientists believed they were necessary for habitability.
Subduction, in which one plate is pushed deeper into the subsurface by a colliding plate, can also aid in carbon cycling by pushing carbon into the mantle.
Planets without tectonic plates are known as stagnant lid planets. On these planets, the crust is one giant, spherical plate floating on mantle, rather than separate pieces. These are thought to be more widespread than planets with plate tectonics. In fact, Earth is the only planet with confirmed tectonic plates.
Dr. Foley and Dr. Smye created a computer model of the lifecycle of a planet.
They looked at how much heat its climate could retain based on its initial heat budget, or the amount of heat and heat-producing elements present when a planet forms.
Some elements produce heat when they decay. On Earth, decaying uranium produces thorium and heat, and decaying thorium produces potassium and heat.
After running hundreds of simulations to vary a planet’s size and chemical composition, they found that stagnant lid planets can sustain conditions for liquid water for billions of years. At the highest extreme, these planets could sustain life for up to 4 billion years.
“You still have volcanism on stagnant lid planets, but it’s much shorter lived than on planets with plate tectonics because there isn’t as much cycling,” Dr. Smye said.
“Volcanoes result in a succession of lava flows, which are buried like layers of a cake over time. Rocks and sediment heat up more the deeper they are buried.”
“We found that at high enough heat and pressure, carbon dioxide gas can escape from rocks and make its way to the surface, a process known as degassing,” he added.
“On Earth, the same process occurs with water in subduction fault zones.”
“This degassing process increases based on what types and quantities of heat-producing elements are present in a planet up to a certain point,” Dr. Foley said.
“There’s a sweet spot range where a planet is releasing enough carbon dioxide to keep the planet from freezing over, but not so much that the weathering can’t pull carbon dioxide out of the atmosphere and keep the climate temperate.”
According to the team’s model, the presence and amount of heat-producing elements were far better indicators for a planet’s potential to sustain life.
“One interesting take-home point of this study is that the initial composition or size of a planet is important in setting the trajectory for habitability. The future fate of a planet is set from the outset of its birth,” Dr. Smye said.
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Bradford J. Foley & Andrew J. Smye. 2018. Carbon Cycling and Habitability of Earth-Sized Stagnant Lid Planets. Astrobiology 18 (7); doi: 10.1089/ast.2017.1695
