Composition-dependent outgassing of comet 67P/Churyumov-Gerasimenko from ROSINA/DFMS

Luspay-Kuti, A.; Hässig, Myrtha; Fuselier, S. A.; Mandt, K. E.; Altwegg, Kathrin; Balsiger, Hans; Gasc, Sébastien; Jäckel, Annette; Le Roy, Léna; Rubin, Martin; Tzou, Chia-Yu; Wurz, Peter; Mousis, O.; Dhooghe, F.; Berthelier, J. J.; Fiethe, B.; Gombosi, T. I.; Mall, U. (2015). Composition-dependent outgassing of comet 67P/Churyumov-Gerasimenko from ROSINA/DFMS. Astronomy and astrophysics, 583(A4), A4. EDP Sciences 10.1051/0004-6361/201526205

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Context. Early measurements of Rosetta’s target comet, 67P/Churyumov-Gerasimenko (67P), showed a strongly heterogeneous coma in H2O, CO, and CO2. Aims. The purpose of this work is to further investigate the coma heterogeneity of 67P, and to provide predictions for the near-perihelion outgassing profile based on the proposed explanations. Methods. Measurements of various minor volatile species by ROSINA/DFMS on board Rosetta are examined. The analysis focuses on the currently poorly illuminated winter (southern) hemisphere of 67P. Results. Coma heterogeneity is not limited to the major outgassing species. Minor species show better correlation with either H2O or CO2. The molecule CH4 shows a different diurnal pattern from all other analyzed species. Such features have implications for nucleus heterogeneity and thermal processing. Conclusions. Future analysis of additional volatiles and modeling the heterogeneity are required to better understand the observed coma profile.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Hässig, Myrtha; Altwegg, Kathrin; Balsiger, Hans; Gasc, Sébastien; Jäckel, Annette; Le Roy, Léna; Rubin, Martin; Tzou, Chia-Yu and Wurz, Peter

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Martin Rubin

Date Deposited:

13 Jun 2016 16:07

Last Modified:

06 Jul 2016 17:00

Publisher DOI:

10.1051/0004-6361/201526205

BORIS DOI:

10.7892/boris.74126

URI:

https://boris.unibe.ch/id/eprint/74126

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