Hydrothermal processing of cometary volatiles--applications to Triton

Area of Science:

• Planetary Science
• Astrobiology
• Geochemistry

Background:

• Neptune's moon Triton may have undergone significant tidal heating after capture.
• This heating could have induced hydrothermal circulation within Triton's interior.

Purpose of the Study:

• To investigate the chemical consequences of hydrothermal reprocessing on Triton's volatile composition.
• To assess the potential for organic chemistry relevant to the origin of life.

Main Methods:

• Modeling the chemical effects of hydrothermal circulation on a cometary-composition icy mantle.
• Evaluating the influence of temperature and oxidation state on volatile reprocessing.

Main Results:

• Hydrothermal reprocessing can explain the low abundance of carbon monoxide (CO) in Triton's atmosphere and surface ices.
• Nitrogen (N2) and ammonia (NH3) are predicted to be abundant products.
• Various organic compounds, including methanol and urea, may form depending on conditions.

Conclusions:

• Triton's hydrothermal history could have significantly altered its volatile inventory.
• Triton may preserve evidence of prebiotic organic chemistry, offering insights into life's origins.