Habitability of the early Earth: Liquid water under a faint young Sun facilitated by strong tidal heating due to a closer Moon

TL;DR

This paper investigates whether tidal heating from a close Moon could have contributed enough warmth to keep early Earth’s surface liquid water despite the faint young Sun, offering a potential piece of the faint-young-sun paradox puzzle.

Contribution

It introduces a model using tidal theory to quantify early Earth tidal heating from a close Moon, highlighting its possible role in early Earth's climate.

Findings

Tidal heating could have increased early Earth's temperature by up to 5°C.

The Earth-Moon system lost about 3×10^31 Joules of energy through tidal friction.

Tidal heating alone does not fully resolve the faint-young-sun paradox but may be a significant factor.

Abstract

Geological evidence suggests liquid water near the Earth's surface as early as 4.4 billion years ago when the faint young Sun only radiated about 70% of its modern power output. At this point, the Earth should have been a global snowball if it possessed atmospheric properties similar to those of the modern Earth. An extreme atmospheric greenhouse effect, an initially more massive Sun, release of heat acquired during the accretion process of protoplanetary material, and radioactivity of the early Earth material have been proposed as reservoirs or traps for heat. For now, the faint-young-sun paradox persists as an important problem in our understanding of the origin of life on Earth. Here we use the constant-phase-lag tidal theory to explore the possibility that the new-born Moon, which formed about 69 million years after the ignition of the Sun, generated extreme tidal friction - and therefore heat - in the Hadean and possibly the Archean Earth. We show that the Earth-Moon system has lost about $3~ \times ~10^{31}$ J (99% of its initial mechanical energy budget) as tidal heat. Tidal heating of roughly 10 W/m$^{-2}$ through the surface on a time scale of 100 million years could have accounted for a temperature increase of up to 5 degrees Celsius on the early Earth. This heating effect alone does not solve the faint-young-sun paradox but it could have played a key role in combination with other effects. Future studies of the interplay of tidal heating, the evolution of the solar power output, and the atmospheric (greenhouse) effects on the early Earth could help in solving the faint-young-sun paradox.