Cessateur, G.; De Keyser, J.; Maggiolo, R.; Rubin, Martin; Gronoff, G.; Gibbons, A.; Jehin, E.; Dhooghe, F.; Gunell, H.; Vaeck, N.; Loreau, J. (2016). 2D photochemical model for forbidden oxygen line emission for comet 1P/Halley. Monthly notices of the Royal Astronomical Society, 462(Suppl 1), S116-S123. Oxford University Press 10.1093/mnras/stw2150
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We present here a 2D model of photochemistry for computing the production and loss mechanisms of the O(1S) and O(1D) states, which are responsible for the emission lines at 577.7, 630, and 636.4 nm, in case of the comet 1P/Halley. The presence of O2 within cometary atmospheres, measured by the in situ Rosetta and Giotto missions, necessitates a revision of the usual photochemical models. Indeed, the photodissociation of molecular oxygen also leads to a significant production of oxygen in excited electronic states. In order to correctly model the solar ultraviolet (UV) flux absorption, we consider here a 2D configuration. While the green to red-doublet ratio is not affected by the solar UV flux absorption, estimates of the red-doublet and green lines emissions are, however, overestimated by a factor of 2 in the 1D model compared to the 2D model. Considering a spherical symmetry, emission maps can be deduced from the 2D model in order to be directly compared to ground and/or in situ observations.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences |
UniBE Contributor: |
Rubin, Martin |
Subjects: |
500 Science > 520 Astronomy 500 Science > 530 Physics 600 Technology > 620 Engineering |
ISSN: |
0035-8711 |
Publisher: |
Oxford University Press |
Language: |
English |
Submitter: |
Katharina Weyeneth-Moser |
Date Deposited: |
04 Jul 2017 07:58 |
Last Modified: |
05 Dec 2022 15:03 |
Publisher DOI: |
10.1093/mnras/stw2150 |
BORIS DOI: |
10.7892/boris.97008 |
URI: |
https://boris.unibe.ch/id/eprint/97008 |
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