English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The ideal exoplanets to search for life are those within a star's habitablezone. However, even within the habitable zone planets can still developuninhabitable climate states. Sustaining a temperate climate over geologic($\sim$Gyr) timescales requires a planet contain sufficient internal energy topower a planetary-scale carbon cycle. A major component of a rocky planet'senergy budget is the heat produced by the decay of radioactive elements,especially $^{40}$K, $^{232}$Th, $^{235}$U and $^{238}$U. As the planet agesand these elements decay, this radiogenic energy source dwindles. Here weestimate the probability distribution of the amount of these heat producingelements (HPEs) that enter into rocky exoplanets through Galactic history, bycombining the system-to-system variation seen in stellar abundance data withthe results from Galactic chemical evolution models. Using these distributions,we perform Monte-Carlo thermal evolution models that maximize the mantlecooling rate. This allows us to create a pessimistic estimate of lifetime arocky, stagnant-lid exoplanet can support a global carbon cycle and temperateclimate as a function of its mass and when it in Galactic history. We applythis framework to a sample of 17 likely rocky exoplanets with measured ages, 7of which we predict are likely to be actively degassing today despite ourpessimistic assumptions. For the remaining planets, including those orbitingTRAPPIST-1, we cannot confidently assume they currently contain sufficientinternal heat to support mantle degassing at a rate sufficient to sustain aglobal carbon cycle or temperate climate without additional tidal heating orundergoing plate tectonics.

Mantle Degassing Lifetimes through Galactic Time and the Maximum Age Stagnant-lid Rocky Exoplanets can Support Temperate Climates