X-ray photodesorption from water ice in protoplanetary disks and X-ray dominated regions
Autor: | Mathieu Bertin, Maud Hassenfratz, Xavier Michaut, Vincent Baglin, Rémi Dupuy, Géraldine Féraud, Pascal Jeseck, Laurent Philippe, T. Putaud, Claire Romanzin, Roberto Cimino, Jean-Hugues Fillion, M. Angelucci |
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Přispěvatelé: | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratori Nazionali di Frascati (LNF), Istituto Nazionale di Fisica Nucleare (INFN), European Organization for Nuclear Research (CERN), Laboratoire de Chimie Physique D'Orsay (LCPO), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Chemical Physics (physics.chem-ph)
Materials science 010304 chemical physics Molecular cloud FOS: Physical sciences Astronomy and Astrophysics medicine.disease_cause Astrophysics - Astrophysics of Galaxies 01 natural sciences Ion Interstellar medium 13. Climate action Chemical physics Physics - Chemical Physics Ionization Yield (chemistry) Desorption Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences medicine [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] 010303 astronomy & astrophysics Water vapor Ultraviolet |
Zdroj: | Nature Astronomy Nature Astronomy, Nature Publishing Group, 2018, 2, pp.796-801. ⟨10.1038/s41550-018-0532-y⟩ |
ISSN: | 2397-3366 |
Popis: | Water is the main constituent of interstellar ices, and it plays a key role in the evolution of many regions of the interstellar medium, from molecular clouds to planet-forming disks1. In cold regions of the interstellar medium, water is expected to be completely frozen out onto the dust grains. Nonetheless, observations indicate the presence of cold water vapour, implying that non-thermal desorption mechanisms are at play. Photodesorption by ultraviolet photons has been proposed to explain these observations2,3, with the support of extensive experimental and theoretical work on ice analogues4–6. In contrast, photodesorption by X-rays, another viable mechanism, has been little studied. The potential of this process to desorb key molecules such as water, intact rather than fragmented or ionized, remains unexplored. We experimentally investigated X-ray photodesorption from water ice, monitoring all desorbing species. We found that desorption of neutral water is efficient, while ion desorption is minor. We derived yields that can be implemented in astrochemical models. These results open up the possibility of taking into account the X-ray photodesorption process in the modelling of protoplanetary disks or X-ray-dominated regions. The X-ray-induced photodesorption of water from astrophysical ices, intact, has been little studied. However, it could be a key process in producing the cold water vapour that is seen in these regions. Here, the yield of such a mechanism is experimentally quantified. |
Databáze: | OpenAIRE |
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