Formation of Complex Organic and Prebiotic Molecules in H2O:NH3:CO2 Ices at Temperatures Relevant to Hot Cores, Protostellar Envelopes, and Planet-Forming Disks
- Alexey Potapov*
- Daniele FulvioDaniele FulvioOsservatorio Astronomico di Capodimonte, Istituto Nazionale di Astrofisica, Salita Moiariello 16, 80131, Naples, ItalyMax Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, GermanyMore by Daniele Fulvio
- Serge KrasnokutskiSerge KrasnokutskiLaboratory Astrophysics Group of the Max Planck Institute for Astronomy at the Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 3, 07743 Jena, GermanyMore by Serge Krasnokutski
- Cornelia JägerCornelia JägerLaboratory Astrophysics Group of the Max Planck Institute for Astronomy at the Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 3, 07743 Jena, GermanyMore by Cornelia Jäger
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- Thomas HenningThomas HenningMax Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, GermanyMore by Thomas Henning
Photochemistry in H2O:NH3:CO2 cosmic ice analogues was studied at temperatures of 75, 120, and 150 K, relevant to hot cores and warmer regions in protostellar envelopes and planet-forming disks. A combination of two triggers of surface chemistry in cosmic ice analogues, heat and UV irradiation, compared to using either just heat or UV irradiation, leads to a larger variety and an increased production of complex organic molecules, including potential precursors of prebiotic molecules. In addition to complex organic molecules detected in previous studies of H2O:NH3:CO2 ices, ammonium carbamate, carbamic acid, ammonium formate and formamide, we detected acetaldehyde, urea, and, tentatively, glycine, the simplest amino acid. Water ice hampers reactions at low temperature (75 K) but allows the parent molecules, CO2 and NH3, to stay in the solid state and react at higher temperatures (120 and 150 K, above their desorption temperatures). The experiments were performed on the surface of KBr substrates and amorphous silicate grains, analogs of cosmic silicate dust. The production of complex molecules on the silicate surface is decreased compared to KBr. This result suggests that the larger surface area and/or surface properties of the silicate grains play a role in controlling the chemistry, preventing it taking place to the same extent as on the flat KBr substrate. This is further evidence of the fact that cosmic dust grains play an important role in the chemistry taking place on their surface.
This article is cited by 2 publications.
- Ryan C. Fortenberry, Robert J. McMahon, Ralf I. Kaiser. 10 Years of the ACS PHYS Astrochemistry Subdivision. The Journal of Physical Chemistry A 2022, 126 (38) , 6571-6574. https://doi.org/10.1021/acs.jpca.2c06091
- Alexey Potapov, Maria Elisabetta Palumbo, Zelia Dionnet, Andrea Longobardo, Cornelia Jäger, Giuseppe Baratta, Alessandra Rotundi, Thomas Henning. Exploring Refractory Organics in Extraterrestrial Particles. The Astrophysical Journal 2022, 935 (2) , 158. https://doi.org/10.3847/1538-4357/ac7f32