Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 28, Pages 16149-16153Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2005225117
Keywords
astrochemistry; protoplanetary disks; X-rays; methods: laboratory: molecular
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Funding
- Spanish Ministry of Science, Innovation and Universities [AYA201785322-R, MDM-2017-0737]
- PRIN-INAF 2016 The Cradle of Life -GENESIS-SKA
- MOST from Taiwan [MOST 107-2112-M-008-016-MY3]
- ASI-INAF [n.2018-16-HH.0]
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The Atacama Large Millimeter Array has allowed a detailed obser-vation of molecules in protoplanetary disks, which can evolve toward solar systems like our own. While CO, CO2, HCO, and H2CO are often abundant species in the cold zones of the disk, CH3OH or CH3CN are only found in a few regions, and more-complex organic molecules are not observed. We simulate, experimentally, ice processing in disks under realistic conditions, that is, layered ices irradiated by soft X-rays. X-ray emission from young solar -type stars is thousands of times brighter than that of today's sun. The ice mantle is composed of a H2O:CH4:NH3 mixture, cov-ered by a layer made of CH3OH and CO. The photoproducts found desorbing from both ice layers to the gas phase during the irradiation converge with those detected in higher abundances in the gas phase of protoplanetary disks, providing important insights on the nonthermal processes that drive the chemistry in these objects.
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