Evolution of H2O related species in the neutral coma of 67P
Abstract:The ROSINA-DFMS mass spectrometer has been probing the coma of 67P
since the spacecraft arrived at the comet in August 2014.
The acquired data set covers a large range of viewing geometries for
the ever changing conditions of 67P along its journey to pericenter. With the high temporal resolution
of ROSINA-DFMS we are able to examine diurnal and seasonal changes
of different species in the gaseous coma.
Large scale heterogeneities in the coma have been reported
since the very first measurements of the neutral inventory at 67P.
Many of the minor species are seen to follow one of the major compounds,
H2O, CO or CO2.
In this paper we will present the latest results on H2O related species.
We will discuss the possible trapping/building mechanisms responsible
for these species and why it is different from other species such as
CO, N2 or CO2.
Work at the University of Michigan was funded by NASA contract JPL-1266313.
Work at UoB was funded by the State of Bern, the Swiss National Science Foundationand the European Space Agency PRODEX Program. Work at MPS was funded by the Max-Planck Society and BMWI contract 50QP1302. Work at Southwest Research institute was supported by subcontract #1496541 from the Jet Propulsion Laboratory. Work at BIRA-IASB was supported by the Belgian Science Policy Office via PRODEX/ROSINA PEA 90020. This work has been carried out thanks to the support of the A*MIDEX project (n° ANR-11-IDEX-0001-02) funded by the « Investissements d’Avenir » French Government program, managed by the French National Research Agency (ANR). This work was supported by CNES grants at IRAP, LATMOS, LPC2E, UTINAM, CRPG, and by the European Research Council (grant no. 267255 to B. Marty). A. Bar-Nun thanks the Ministry of Science and the Israel Space agency. Work by JHW at Southwest Research Institute was funded by the NASA JPL subcontract NAS703001TONMO710889. EvD and CW are supported by A-ERC grant 291141 CHEMPLAN and an NWO Veni award. We acknowledge herewith the work of the whole ESA Rosetta team.