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Title: Efficient Production of S8 in Interstellar Ices: The Effects of Cosmic-Ray-driven Radiation Chemistry and Nondiffusive Bulk Reactions
Authors: Shingledecker, C. N.
Lamberts, T.
Laas, J. C.
Vasyunin, A.
Herbst, E.
Kästner, J.
Caselli, P.
Issue Date: 2020
Publisher: Institute of Physics Publishing
Citation: Efficient Production of S8 in Interstellar Ices: The Effects of Cosmic-Ray-driven Radiation Chemistry and Nondiffusive Bulk Reactions / C. N. Shingledecker, T. Lamberts, J. C. Laas, et al. — DOI 10.3847/1538-4357/ab5360 // Astrophysical Journal. — 2020. — Vol. 888. — Iss. 1. — 52.
Abstract: In this work, we reexamine sulfur chemistry occurring on and in the ice mantles of interstellar dust grains, and report the effects of two new modifications to standard astrochemical models: Namely, (a) the incorporation of cosmic-ray-driven radiation chemistry and (b) the assumption of fast, nondiffusive reactions for key radicals in the bulk. Results from our models of dense molecular clouds show that these changes can have a profound influence on the abundances of sulfur-bearing species in ice mantles, including a reduction in the abundance of solid-phase H2S and HS, and a significant increase in the abundances of OCS, SO2, as well as pure allotropes of sulfur, especially S8. These pure-sulfur species-though nearly impossible to observe directly-have long been speculated to be potential sulfur reservoirs and our results represent possibly the most accurate estimates yet of their abundances in the dense interstellar medium. Moreover, the results of these updated models are found to be in good agreement with available observational data. Finally, we examine the implications of our findings with regard to the as-yet-unknown sulfur reservoir thought to exist in dense interstellar environments. © 2020. The American Astronomical Society. All rights reserved.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85081732294
PURE ID: 12014230
ISSN: 0004637X
DOI: 10.3847/1538-4357/ab5360
metadata.dc.description.sponsorship: C.N.S. thanks the Alexander von Humboldt Foundation for their generous support and both K. Altwegg and W.F. Thi for stimulating discussions during the course of this project. T.L. is grateful for support from the Netherlands Organisation for Scientific Research (NWO) via a VENI fellowship (722.017.008). E.H. thanks the National Science Foundation for support of his program in astrochemistry (AST 1906489). The work by A.V. is supported by the Russian Science Foundation via the Project 18-12-00351. A.V. is the head of the Partner Group of the Max Planck Institute for Extraterrestrial Physics, Garching, at the Ural Federal University, Ekaterinburg, Russia.
RSCF project card: 18-12-00351
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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