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Title: Production of Sulfur Allotropes in Electron Irradiated Jupiter Trojans Ice Analogs

Abstract

In this paper, we investigate sulfur chemistry in laboratory analogs of Jupiter Trojans and Kuiper Belt Objects (KBOs). Electron irradiation experiments of CH{sub 3}OH–NH{sub 3}–H{sub 2}O and H{sub 2}S–CH{sub 3}OH–NH{sub 3}–H{sub 2}O ices were conducted to better understand the chemical differences between primordial planetesimals inside and outside the sublimation line of H{sub 2}S. The main goal of this work is to test the chemical plausibility of the hypothesis correlating the color bimodality in Jupiter Trojans with sulfur chemistry in the incipient solar system. Temperature programmed desorption (TPD) of the irradiated mixtures allows the detection of small sulfur allotropes (S{sub 3} and S{sub 4}) after the irradiation of H{sub 2}S containing ice mixtures. These small, red polymers are metastable and could polymerize further under thermal processing and irradiation, producing larger sulfur polymers (mainly S{sub 8}) that are spectroscopically neutral at wavelengths above 500 nm. This transformation may affect the spectral reflectance of Jupiter Trojans in a different way compared to KBOs, thereby providing a useful framework for possibly differentiating and determining the formation and history of small bodies. Along with allotropes, we report the production of organo-sulfur molecules. Sulfur molecules produced in our experiment have been recently detected by Rosetta inmore » the coma of 67P/Churyumov–Gerasimenko. The very weak absorption of sulfur polymers in the infrared range hampers their identification on Trojans and KBOs, but these allotropes strongly absorb light at UV and Visible wavelengths. This suggests that high signal-to-noise ratio UV–Vis spectra of these objects could provide new constraints on their presence.« less

Authors:
; ;
Publication Date:
OSTI Identifier:
22679858
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 846; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; AMMONIA; ELECTRONS; HYDROGEN SULFIDES; ICE; IRRADIATION; JUPITER PLANET; METHANOL; MOLECULES; SIGNAL-TO-NOISE RATIO; SIMULATION; SOLAR SYSTEM; SPECTRAL REFLECTANCE; SULFUR; THERMAL DESORPTION SPECTROSCOPY; ULTRAVIOLET SPECTRA; VISIBLE RADIATION; VISIBLE SPECTRA; WATER

Citation Formats

Mahjoub, Ahmed, Poston, Michael J., and Blacksberg, Jo. Production of Sulfur Allotropes in Electron Irradiated Jupiter Trojans Ice Analogs. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA85E0.
Mahjoub, Ahmed, Poston, Michael J., & Blacksberg, Jo. Production of Sulfur Allotropes in Electron Irradiated Jupiter Trojans Ice Analogs. United States. doi:10.3847/1538-4357/AA85E0.
Mahjoub, Ahmed, Poston, Michael J., and Blacksberg, Jo. Sun . "Production of Sulfur Allotropes in Electron Irradiated Jupiter Trojans Ice Analogs". United States. doi:10.3847/1538-4357/AA85E0.
@article{osti_22679858,
title = {Production of Sulfur Allotropes in Electron Irradiated Jupiter Trojans Ice Analogs},
author = {Mahjoub, Ahmed and Poston, Michael J. and Blacksberg, Jo},
abstractNote = {In this paper, we investigate sulfur chemistry in laboratory analogs of Jupiter Trojans and Kuiper Belt Objects (KBOs). Electron irradiation experiments of CH{sub 3}OH–NH{sub 3}–H{sub 2}O and H{sub 2}S–CH{sub 3}OH–NH{sub 3}–H{sub 2}O ices were conducted to better understand the chemical differences between primordial planetesimals inside and outside the sublimation line of H{sub 2}S. The main goal of this work is to test the chemical plausibility of the hypothesis correlating the color bimodality in Jupiter Trojans with sulfur chemistry in the incipient solar system. Temperature programmed desorption (TPD) of the irradiated mixtures allows the detection of small sulfur allotropes (S{sub 3} and S{sub 4}) after the irradiation of H{sub 2}S containing ice mixtures. These small, red polymers are metastable and could polymerize further under thermal processing and irradiation, producing larger sulfur polymers (mainly S{sub 8}) that are spectroscopically neutral at wavelengths above 500 nm. This transformation may affect the spectral reflectance of Jupiter Trojans in a different way compared to KBOs, thereby providing a useful framework for possibly differentiating and determining the formation and history of small bodies. Along with allotropes, we report the production of organo-sulfur molecules. Sulfur molecules produced in our experiment have been recently detected by Rosetta in the coma of 67P/Churyumov–Gerasimenko. The very weak absorption of sulfur polymers in the infrared range hampers their identification on Trojans and KBOs, but these allotropes strongly absorb light at UV and Visible wavelengths. This suggests that high signal-to-noise ratio UV–Vis spectra of these objects could provide new constraints on their presence.},
doi = {10.3847/1538-4357/AA85E0},
journal = {Astrophysical Journal},
number = 2,
volume = 846,
place = {United States},
year = {Sun Sep 10 00:00:00 EDT 2017},
month = {Sun Sep 10 00:00:00 EDT 2017}
}