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http://hdl.handle.net/20.500.12386/32726
Title: | Near-infrared Methanol Bands Probe Energetic Processing of Icy Outer Solar System Objects | Authors: | URSO, Riccardo Giovanni Baklouti, Donia Djouadi, Zahia Pinilla-Alonso, Noemí Brunetto, Rosario |
Issue Date: | 2020 | Journal: | THE ASTROPHYSICAL JOURNAL LETTERS | Number: | 894 | Issue: | 1 | First Page: | L3 | Abstract: | Frozen methanol was detected in the outer solar system on the surfaces of the Centaur 5145 Pholus, the Trans-Neptunian Object (55638) 2002 VE<SUB>95</SUB>, and more recently on (486958) Arrokoth. The icy surfaces of these objects are subjected to solar and cosmic ions that modify the physico-chemical properties of their surface. To study the effects of ion bombardment on methanol-rich surfaces, we performed experiments of ion irradiation of H<SUB>2</SUB>O:CH<SUB>3</SUB>OH mixtures and we monitored the evolution of the methanol near-infrared bands. We observed significant variations of the 2.34/2.27 μm methanol band ratios as a function of the irradiation dose. We then used the Arrokoth and Pholus spectra to test the 2.34/2.27 μm band ratio as a probe of irradiation of methanol-rich surfaces, and we estimated the timescales of processing by solar and cosmic ions. Our results indicate that solar energetic particles are the main drivers of changes in the near-infrared spectra of frozen surfaces in the outer solar system. | URI: | http://hdl.handle.net/20.500.12386/32726 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/ab8ad9 https://api.elsevier.com/content/abstract/scopus_id/85086328583 |
ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/ab8ad9 | Bibcode ADS: | 2020ApJ...894L...3U | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Urso et al. 2020 ApJL.pdf | Pdf editoriale | 890.98 kB | Adobe PDF | View/Open |
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