Jean-Baptiste Vincent

MPS
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COSSIM: COma Structures SIMulator

One of my main scientific goals is to understand the formation and evolution of dust coma structures at all scales: from tiny filaments only visible close to the surface of the nucleus, to large structures extending tens of thousands of kilometers in the coma.
For this pupose I am developping a numerical model that can be used to :
Movie generated by COSSIM (version 2.5.0): dust jets of comet 67P/C-G as they would be observed by the OSIRIS WAC camera on board Rosetta.


The software package is divided in three parts:
COSSIM tries to be as complete as possible and takes into account the real topography, outgassing rate, temperature of the surface, illumination conditions, presence of different ices and dust. We are working now on adding dust fragmentation and grain sublimation to the model.

COma Structures SIMulator (COSSIM)
Typical small jets seen close to a nucleus surface
(left: 9P/Tempel 1 image; right: Pi-DSMC-MPS model)
COma Structures SIMulator (COSSIM)
Medium scale jets of 9P/Tempel 1
(left: real image; right: COSSIM model for a generic comet)
COma Structures SIMulator (COSSIM)
Large scale jets seen in enhanced ground based observations
(left: 81P/Wild 2 image; right: COSSIM model)
COma Structures SIMulator (COSSIM)
Large scale jets seen in enhanced ground based observations
(left: 9P/C-G image; right: COSSIM model)