X-ray processing of a realistic ice mantle can explain the gas abundances in protoplanetary disks
| Autor: | Angela Ciaravella, C.-H. Huang, A. Jiménez-Escobar, Guillermo M. Muñoz Caro, Y.-J. Chen, Cesare Cecchi-Pestellini, L.-C. Hsiao |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0303 health sciences
Multidisciplinary Astrochemistry Astrophysics::Instrumentation and Methods for Astrophysics X-ray Astrophysics Atacama Large Millimeter Array 01 natural sciences Corrections Mantle (geology) Organic molecules Gas phase 03 medical and health sciences Stars 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Molecule Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 030304 developmental biology |
| Zdroj: | Proc Natl Acad Sci U S A |
| ISSN: | 1091-6490 |
| Popis: | The Atacama Large Millimeter Array has allowed a detailed observation of molecules in protoplanetary disks, which can evolve toward solar systems like our own. While CO, [Formula: see text], HCO, and [Formula: see text] are often abundant species in the cold zones of the disk, [Formula: see text] or [Formula: see text] 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 [Formula: see text]:[Formula: see text]:[Formula: see text] mixture, covered by a layer made of [Formula: see text] 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. |
| Databáze: | OpenAIRE |
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