Diving into Exoplanets: Are Water Seas the Most Common?

Area of Science:

• Astrobiology
• Planetary Science
• Exoplanet Research

Background:

• Life as we know it requires a liquid medium, with water being the primary focus.
• The search for extraterrestrial life often assumes water as the essential solvent.
• Alternative liquid solvents for life on exoplanets have been proposed but not extensively studied.

Purpose of the Study:

• To investigate the probability of superficial seas on rocky exoplanets using nine different liquids.
• To compare the potential habitability of exoplanets based on various liquid solvents.
• To assess the prevalence of non-water-based seas in the Milky Way.

Main Methods:

• Calculated habitable zone phase space sizes for nine potential liquid substrates.
• Modeled liquid presence around stars, excluding tidally locked regions.
• Combined habitable zone size with stellar and planetary abundance data.

Main Results:

• Ethane seas could be up to nine times more frequent than water seas on exoplanets.
• The study identified potential regions for various liquid seas across different star types.
• Non-water solvents may be significant in the search for extrasolar life.

Conclusions:

• The prevalence of extraterrestrial seas may be underestimated by focusing solely on water.
• Ethane and other solvents present viable alternatives for harboring life.
• Future exobiology research should consider a broader range of liquid environments.