Electrostatic activation of prebiotic chemistry in substellar atmospheres

Craig R. Stark, Ch. Helling, D. A. Diver, P. B. Rimmer

Research output: Contribution to journalArticle

  • 3 Citations

Abstract

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 synthesized 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 ≈1 eV (≈104 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 pages8
JournalInternational Journal of Astrobiology
Volume13
Issue number2
DOIs
StatePublished - 14 Jan 2014

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ions
atmospheres
dust
electron energy
activation energy
molecules
energy
gas giant planets
hydrocyanic acid
extrasolar planets
glycine
formaldehyde
amino acids
bombardment
ammonia
chemical reactions
activation
chemistry
electrostatics
excitation

Cite this

Stark, Craig R.; Helling, Ch.; Diver, D. A.; Rimmer, P. B. / Electrostatic activation of prebiotic chemistry in substellar atmospheres.

In: International Journal of Astrobiology, Vol. 13, No. 2, 14.01.2014, p. 165-172.

Research output: Contribution to journalArticle

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Electrostatic activation of prebiotic chemistry in substellar atmospheres. / Stark, Craig R.; Helling, Ch.; Diver, D. A.; Rimmer, P. B.

In: International Journal of Astrobiology, Vol. 13, No. 2, 14.01.2014, p. 165-172.

Research output: Contribution to journalArticle

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AB - 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 synthesized 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 ≈1 eV (≈104 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.

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