Electrostatic activation of prebiotic chemistry in substellar atmospheres

Craig Ronald Stark, Christiane Helling, Declan A Diver, Paul Rimmer

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
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Charged dust grains in the atmospheres of exoplanets may play a key role in the formation of prebiotic molecules, necessary to the origin of life. Dust grains submerged in an atmospheric plasma become negatively charged and attract a flux of ions that are accelerated from the plasma. The energy of the ions upon reaching the grain surface may be sufficient to overcome the activation energy of particular chemical reactions that would be unattainable via ion and neutral bombardment from classical, thermal excitation. As a result, prebiotic molecules or their precursors could be synthesised on the surface of dust grains that form clouds in exoplanetary atmospheres. This paper investigates the energization of the plasma ions, and the dependence on the plasma electron temperature, in the atmospheres of substellar objects such as gas giant planets. Calculations show that modest electron temperatures of $\approx 1$ eV ($\approx 10^{4}$ K) are enough to accelerate ions to sufficient energies that exceed the activation energies required for the formation of formaldehyde, ammonia, hydrogen cyanide and the amino acid glycine.
Original languageEnglish
Pages (from-to)165-172
Number of pages18
JournalInternational Journal of Astrobiology
Issue numberSpecial Issue 2
Early online date14 Jan 2014
Publication statusPublished - Apr 2014


  • astro-ph.EP
  • Dust
  • Exoplanets
  • Prebiotic Chemistry
  • Plasmas


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