The role of planetary interior in the long-term evolution of atmospheric CO2 on Earth-like exoplanets

Abstract

Context: The long-term carbonate-silicate cycle plays an important role in the evolution of Earth's climate and, therefore, may also be an important mechanism in the evolution of the climates of Earth-like exoplanets. Aims: We investigate the effects of radiogenic mantle heating, core size, and planetary mass on the evolution of the atmospheric partial $C{O}_2$ pressure, and the ability of a long-term carbon cycle driven by plate tectonics to control the atmospheric $C{O}_2$ pressure. Methods: We developed a box-model which connects carbon cycling to parametrized mantle convection. The carbon cycle was coupled to the thermal evolution via the plate speed, which depends on the global Rayleigh number. Results: We find decreasing atmospheric $C{O}_2$ pressure with time, up to an order of magnitude over 10 Gyr. Higher abundances of radioactive isotopes result in higher $C{O}_2$ pressures. We find a decreasing Rayleigh number and plate speed toward planets with larger core mass fractions $f_c$, which leads to lower atmospheric $C{O}_2$ pressure. More massive planets may favor the development of more $C{O}_2$ rich atmospheres due to hotter interiors. Conclusions: The dependence of plate tectonics on mantle cooling has a significant effect on the long-term evolution of the atmospheric $C{O}_2$ pressure. Carbon cycling mediated by plate tectonics is efficient in regulating planetary climates for a wide range of mantle radioactive isotope abundances, planet masses and core sizes. More efficient carbon cycling on planets with a high mantle abundance of thorium or uranium highlights the importance of mapping the abundances of these elements in host stars of potentially habitable exoplanets. Inefficient carbon recycling on planets with a large core mass fraction ($f_c\gtrsim 0.8$) emphasizes the importance of precise mass-radius measurements of Earth-sized exoplanets.

arXiv comment20 pages, 16 figures, to appear in Astronomy & Astrophysics

References in corpus (38)

• Habitable Zones Around Main-Sequence Stars: New Estimates
• A terrestrial planet candidate in a temperate orbit around Proxima Centauri
• Mass-Radius Relationships for Solid Exoplanets
• Defining and cataloging exoplanets: The exoplanet.eu database
• Temperate Earth-sized planets transiting a nearby ultracool dwarf star
• Internal Structure of Massive Terrestrial Planets
• Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs
• Inevitability of Plate Tectonics on Super-Earths
• A Detailed Model Grid for Solid Planets from 0.1 through 100 Earth Masses
• Discovery of HE 1523-0901, a Strongly r-Process Enhanced Metal-Poor Star with Detected Uranium
• Revisited Mass-Radius relations for exoplanets below 120 Earth masses
• Geodynamics and Rate of Volcanism on Massive Earth-like Planets
• Frequent flaring in the TRAPPIST-1 system - unsuited for life?
• Discovery and Validation of Kepler-452b: A 1.6-Re Super Earth Exoplanet in the Habitable Zone of a G2 Star
• Lithium depletion in solar-like stars: no planet connection
• Mantle Dynamics in Super-Earths: Post-Perovskite Rheology and Self-Regulation of Viscosity
• The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star
• The Role of Plate Tectonic-Climate Coupling and Exposed Land Area in the Development of Habitable Climates on Rocky Planets
• Scaling the Earth: A Sensitivity Analysis of Terrestrial Exoplanetary Interior Models
• Indication of insensitivity of planetary weathering behavior and habitable zone to surface land fraction
• Outgassing on stagnant-lid super-Earths
• Coreless Terrestrial Exoplanets
• Carbon cycling and habitability of Earth-size stagnant lid planets
• The habitability of a stagnant-lid Earth
• Actinides: How well do we know their stellar production?
• A Statistical Comparative Planetology Approach to the Hunt for Habitable Exoplanets and Life Beyond the Solar System
• A Neptune-mass Planet Orbiting the Nearby G Dwarf HD16417
• Thermodynamic and Energetic Limits on Continental Silicate Weathering Strongly Impact the Climate and Habitability of Wet, Rocky Worlds
• The influence of bulk composition on long-term interior-atmosphere evolution of terrestrial exoplanets
• Habitability of Earth-like stagnant lid planets: Climate evolution and recovery from snowball states
• Carbon cycling and interior evolution of water-covered plate tectonics and stagnant lid planets
• Subduction and atmospheric escape of Earth's seawater constrained by hydrogen isotopes
• Scaling Laws for Convection with Temperature-dependent Viscosity and Grain-damage
• Lithologic Controls on Silicate Weathering Regimes of Temperate Planets
• Layered Uncertainty in Planetary Thermal History Models: Implications for Hypotheses Discrimination and Habitability Modeling
• Bifurcation in the growth of continental crust
• Planetary thermal evolution models with tectonic transitions
• A Note on Planet Size and Cooling Rate

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• Eta-Earth Revisited II: Deriving a Maximum Number of Earth-like Habitats in the Galactic Disk
• Orbital Dynamics and the Evolution of Planetary Habitability in the AU Mic System
• A rocky exoplanet classification method and its application to calculating surface pressure and surface temperature
• Exploring the habitability and interior composition of exoplanets lying within the extended habitable zone
• Bioverse: Potentially Observable Exoplanet Biosignature Patterns Under the UV Threshold Hypothesis for the Origin of Life
• The effect of a biosphere on the habitable timespan of stagnant-lid planets and implications for the atmospheric spectrum
• Mantle Degassing Lifetimes through Galactic Time and the Maximum Age Stagnant-lid Rocky Exoplanets can Support Temperate Climates
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