Formation of complex organic molecules in ice mantles: An ab initio molecular dynamics study

Inostroza-Pino, Natalia; Mardones, Diego; Cernicharo, Jose; Zinnecker, Hans; Ge, Jixing; Aria, N.; Fuentealba P.; CÁrdenas, Carlos Alberto

Keywords: molecular processes, dust, extinction, astrochemistry, ism: molecules

Abstract

We present a detailed simulation of a dust grain covered by a decamer of (CH3OH)(10)-ice-mantle, bombarded by an OH- closed-shell molecule with kinetic energies from 10-22 eV. The chemical pathways are studied through Born-Oppenheimer (ab initio) molecular dynamics. The simulations show that methanol ice-mantles can be a key generator of complex organic molecules (COMs). We report the formation of COMs such as methylene glycol (CH2(OH)(2)) and the OCH2 OH radical, which have not been detected yet in the interstellar medium (ISM). We discuss the chemical formation of new species through the reaction of CH3 OH with the hydroxyl projectile. The dependence of the outcome on the kinetic energy of the projectile and the implications for the observation and detection of these molecules might explain why the methoxy radical (CH3 center dot) has been observed in a wider range of astrophysical environments than the hydroxymethyl (CH2OH center dot) isomer. Because of the projectile kinetic energies required for these reactions to occur, we suggest that these processes are likely relevant in the production of COMs in photodissociation and shock regions produced by high-velocity jets and outflows from young stellar objects.

Más información

Título de la Revista: ASTRONOMY & ASTROPHYSICS
Volumen: 629
Editorial: EDP SCIENCES S A
Fecha de publicación: 2019
Página de inicio: A28
Idioma: english
Financiamiento/Sponsor: CONICYT International Networks for young researchers {[}REDI170243]; Vicerectoria de Investigacion y Postgrado (VRIP); CONICYT project Basal {[}AFB170002]; Centers Of Excellence With Basal/Conicyt Financing {[}FB0807]; FONDECYT-Chile grantComisio
DOI:

10.1051/0004-6361/201834035

Notas: ISI