Organic Synthesis via Irradiation and Warming of Ice Grains in the Solar Nebula
Fred J. Ciesla,Scott A. Sandford +1 more
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TLDR
It is found that icy grains originating in the outer disk, where temperatures were less than 30 kelvin, experienced ultraviolet irradiation exposures and thermal warming similar to that which has been shown to produce complex organics in laboratory experiments, implying that organic compounds are natural by-products of protoplanetary disk evolution and should be important ingredients in the formation of all planetary systems, including the authors' own.Abstract:
Complex organic compounds, including many important to life on Earth, are commonly found in meteoritic and cometary samples, though their origins remain a mystery. We examined whether such molecules could be produced within the solar nebula by tracking the dynamical evolution of ice grains in the nebula and recording the environments to which they were exposed. We found that icy grains originating in the outer disk, where temperatures were less than 30 kelvin, experienced ultraviolet irradiation exposures and thermal warming similar to that which has been shown to produce complex organics in laboratory experiments. These results imply that organic compounds are natural by-products of protoplanetary disk evolution and should be important ingredients in the formation of all planetary systems, including our own.read more
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Observations of the Icy Universe
TL;DR: In this paper, a review summarizes the detected infrared spectroscopic ice features and compares the abundances across Galactic, extragalactic, and solar system environments, finding strong evidence for distinct ice formation stages, separated by CO freeze-out at high densities.
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Prebiotic chemicals—amino acid and phosphorus—in the coma of comet 67P/Churyumov-Gerasimenko
Kathrin Altwegg,Hans Balsiger,Akiva Bar-Nun,Jean-Jacques Berthelier,André Bieler,André Bieler,Peter Bochsler,Christelle Briois,Ursina Calmonte,Michael R. Combi,Hervé Cottin,Johan De Keyser,Frederik Dhooghe,Björn Fiethe,Stephen A. Fuselier,Sébastien Gasc,Tamas I. Gombosi,Kenneth C. Hansen,Myrtha Haessig,Myrtha Haessig,Annette Jäckel,E. Kopp,A. Korth,Léna Le Roy,Urs Mall,Bernard Marty,Olivier Mousis,Tobias Owen,Henri Rème,Henri Rème,Martin Rubin,Thierry Sémon,Chia Yu Tzou,James Hunter Waite,Peter Wurz +34 more
TL;DR: The presence of volatile glycine accompanied by methylamine and ethylamines in the coma of 67P/Churyumov-Gerasimenko measured by the ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) mass spectrometer demonstrates that comets could have played a crucial role in the emergence of life on Earth.
Journal ArticleDOI
Observations of the Icy Universe
TL;DR: In this paper, a review summarizes the detected infrared spectroscopic ice features and compares the abundances across Galactic, extragalactic, and solar system environments, finding strong evidence for distinct ice formation stages, separated by CO freeze out at high densities.
Journal ArticleDOI
The comet-like composition of a protoplanetary disk as revealed by complex cyanides
Karin I. Öberg,Viviana V. Guzmán,Kenji Furuya,Chunhua Qi,Yuri Aikawa,Sean M. Andrews,Ryan A. Loomis,David J. Wilner +7 more
TL;DR: It is found that the abundance ratios of these nitrogen-bearing organics in the gas phase are similar to those in comets, which implies that complex organics accompany simpler volatiles in protoplanetary disks, and that the rich organic chemistry of the authors' solar nebula was not unique.
Journal ArticleDOI
The ancient heritage of water ice in the solar system.
L. Ilsedore Cleeves,Edwin A. Bergin,Conel M. O'd. Alexander,Fujun Du,Dawn Graninger,Karin I. Öberg,Tim J. Harries +6 more
TL;DR: Using a comprehensive treatment of disk ionization, it is found that ion-driven deuterium pathways are inefficient, which curtails the disk's deuterated water formation and its viability as the sole source for the solar system’s water.
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