2D photochemical model for forbidden oxygen line emission for comet 1P/Halley

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

[img]
Preview
Text
stw2150.pdf - Published Version
Available under License Publisher holds Copyright.

Download (7MB) | Preview

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)

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:

04 Jul 2017 07:58

Publisher DOI:

10.1093/mnras/stw2150

BORIS DOI:

10.7892/boris.97008

URI:

https://boris.unibe.ch/id/eprint/97008

Actions (login required)

Edit item Edit item
Provide Feedback