scholarly journals On the ion-neutral coupling in cometary comae

2018 ◽  
Vol 482 (2) ◽  
pp. 1937-1941 ◽  
Author(s):  
Erik Vigren ◽  
Anders I Eriksson
Keyword(s):  
Cometary Comae

scholarly journals A new model for theν1vibrational band of HCN in cometary comae, with application to three comets

2013 ◽  
Vol 551 ◽  
pp. A51 ◽  
Author(s):  
M. Lippi ◽  
G. L. Villanueva ◽  
M. A. DiSanti ◽  
H. Böhnhardt ◽  
M. J. Mumma ◽  
...  
Keyword(s):  
New Model ◽  
Cometary Comae

Ion irradiation and extended CO emission in cometary comae

1997 ◽  
Vol 45 (7) ◽  
pp. 835-840 ◽  
Author(s):  
J.R. Brucato ◽  
A.C. Castorina ◽  
M.E. Palumbo ◽  
M.A. Satorre ◽  
G. Strazzulla
Keyword(s):  
Ion Irradiation ◽  
Cometary Comae ◽  
Co Emission

Chemical model calculations of C2, C3, CH, CN, OH, and NH2 abundances in cometary comae

1981 ◽  
Vol 244 ◽  
pp. 1087 ◽  
Author(s):  
G. F. Mitchell ◽  
S. S. Prasad ◽  
W. T. Huntress
Keyword(s):  
Chemical Model ◽  
Model Calculations ◽  
Cometary Comae

Laboratory studies of some of the major ion-molecule reactions occurring in cometary comae

1980 ◽  
Vol 44 ◽  
pp. 481 ◽  
Author(s):  
W. T., Jr. Huntress ◽  
V. G. Anicich ◽  
M. J. McEwan ◽  
Z. Karpas
Keyword(s):  
Laboratory Studies ◽  
Major Ion ◽  
Ion Molecule Reactions ◽  
Cometary Comae

Theoretical description of spectral line profiles of parent molecules in cometary comae

Icarus ◽  
1991 ◽  
Vol 91 (2) ◽  
pp. 238-250 ◽  
Author(s):  
Hong-Yao Hu ◽  
Harold P. Larson ◽  
K.C. Hsieh
Keyword(s):  
Spectral Line ◽  
Theoretical Description ◽  
Line Profiles ◽  
Cometary Comae

CometCIEF: A web-based image enhancement facility to digitally enhance images of cometary comae

2015 ◽  
Vol 118 ◽  
pp. 181-186 ◽  
Author(s):  
M. Patrick Martin ◽  
Nalin Samarasinha ◽  
Stephen Larson
Keyword(s):  
Image Enhancement ◽  
Web Based ◽  
Cometary Comae

scholarly journals Data mining and visualization from planetary missions: the VESPA-Europlanet2020 activity

2016 ◽  
Vol 12 (S325) ◽  
pp. 316-319 ◽  
Author(s):  
Andrea Longobardo ◽  
Maria Teresa Capria ◽  
Angelo Zinzi ◽  
Stavro Ivanovski ◽  
Marco Giardino ◽  
...  
Keyword(s):  
Data Mining ◽  
Data Visualization ◽  
Space Missions ◽  
Planetary Surfaces ◽  
Computation Node ◽  
Planetary Missions ◽  
Cometary Comae

AbstractThis paper presents the VESPA (Virtual European Solar and Planetary Access) activity, developed in the context of the Europlanet 2020 Horizon project, aimed at providing tools for analysis and visualization of planetary data provided by space missions. In particular, the activity is focused on minor bodies of the Solar System.The structure of the computation node, the algorithms developed for analysis of planetary surfaces and cometary comae and the tools for data visualization are presented.

Insights into the nature of cometary organic matter from terrestrial analogues

2012 ◽  
Vol 11 (2) ◽  
pp. 83-92 ◽  
Author(s):  
Richard W. Court ◽  
Mark A. Sephton
Keyword(s):  
Organic Matter ◽  
Cometary Nucleus ◽  
Cometary Nuclei ◽  
Naturally Occurring ◽  
Polycyclic Aromatic ◽  
Radiation Induced ◽  
Remote Observation ◽  
Complex Organic ◽  
Cometary Comae

AbstractThe nature of cometary organic matter is of great interest to investigations involving the formation and distribution of organic matter relevant to the origin of life. We have used pyrolysis–Fourier transform infrared (FTIR) spectroscopy to investigate the chemical effects of the irradiation of naturally occurring bitumens, and to relate their products of pyrolysis to their parent assemblages. The information acquired has then been applied to the complex organic matter present in cometary nuclei and comae. Amalgamating the FTIR data presented here with data from published studies enables the inference of other comprehensive trends within hydrocarbon mixtures as they are progressively irradiated in a cometary environment, namely the polymerization of lower molecular weight compounds; an increased abundance of polycyclic aromatic hydrocarbon structures; enrichment in 13C; reduction in atomic H/C ratio; elevation of atomic O/C ratio and increase in the temperature required for thermal degradation. The dark carbonaceous surface of a cometary nucleus will display extreme levels of these features, relative to the nucleus interior, while material in the coma will reflect the degree of irradiation experienced by its source location in the nucleus. Cometary comae with high methane/water ratios indicate a nucleus enriched in methane, favouring the formation of complex organic matter via radiation-induced polymerization of simple precursors. In contrast, production of complex organic matter is hindered in a nucleus possessing a low methane/water ration, with the complex organic matter that does form possessing more oxygen-containing species, such as alcohol, carbonyl and carboxylic acid functional groups, resulting from reactions with hydroxyl radicals formed by the radiolysis of the more abundant water. These insights into the properties of complex cometary organic matter should be of particular interest to both remote observation and space missions involving in situ analyses and sample return of cometary materials.

scholarly journals Iron and nickel atoms in comet atmospheres

2020 ◽  
Author(s):  
Jean Manfroid ◽  
Damien Hutsemekers ◽  
Emmanuel Jehin
Keyword(s):  
Organic Molecules ◽  
Large Telescope ◽  
Cometary Nuclei ◽  
Near Ultraviolet ◽  
Very Large Telescope ◽  
Order Of Magnitude ◽  
Iron Nickel ◽  
Space Dust ◽  
Complex Organic ◽  
Cometary Comae

Abstract When sufficiently close to the Sun, ices in cometary nuclei sublimate, ejecting in space dust and gases whose compositions can be derived by the remote spectral analysis of the cometary atmospheres. Those very rich spectra reveal a host of constituents from simple radicals like OH and CN in the optical range, to relatively complex organic molecules in the infrared and sub-millimeter domain. The majority of these molecules are made of C, H, O and N atoms. Iron, nickel and a few other siderophile atoms have only been detected in two exceptional sungrazer comets in a century and a half. Here we report that free atoms of iron and nickel are ubiquitous in cometary atmospheres as revealed by high-resolution spectra obtained in the near-ultraviolet with the ESO Very Large Telescope for a large sample of comets of various dynamical origins. The emissions of NiI and FeI in cometary comae have been overlooked until now and, surprisingly, are even detected at large heliocentric distances. The abundances of both species appear to be of the same order of magnitude, contrasting with the typical solar system abundance and providing clues about their origins in comet nuclei.

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