Measuring Organic Matter with COSIMA on Board Rosetta

Christelle Briois1, Donia Baklouti2, Anais Bardyn1,3, Hervé Cottin4, Cécile Engrand5, Henning Fischer6, Nicolas Fray4, Marie Godard5, Martin Hilchenbach6, Hanna von Hoerner7, Herwig Höfner8, Klaus Hornung9, Jochen Kissel6, Yves Langevin10, Lena Le Roy11, Harry Lehto12, Kirsi Lehto12, François-Régis Orthous-Daunay13, Claire Revillet14, Jouni Rynö15, Rita Schulz16, Johan V Silen15, Sandra Siljeström17, Laurent Thirkell1 and COSIMA team, (1)Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, LPC2E, Orléans Cedex 2, France, (2)IAS Institut d'Astrophysique Spatiale, Orsay Cedex, France, (3)LISA Laboratoire Interuniversitaire des Systèmes Atmosphériques, CRETEIL, France, (4)LISA Laboratoire Interuniversitaire des Systèmes Atmosphériques, Créteil, France, (5)Centre de Sciences Nucléaires et de Sciences de la Matiere - CSNSM, 91405 Orsay, France, (6)Max Planck Institute for Solar System Research, Göttingen, Germany, (7)von Hoerner und Sulger GmbH, Schwetzingen, Germany, (8)The Max Planck Institute for Extraterrestrial Physics, Garching, Germany, (9)Universität der Bundeswehr, 85577 Neubiberg, Germany, (10)Institut d'Astrophysique Spatiale, CNRS/Université Paris Saclay, Orsay Cedex, France, (11)University of Bern, Bern, Switzerland, (12)University of Turku, Turku, Finland, (13)IPAG - Institut de Planetologie et d'Astrophysique de Grenoble, Grenoble, France, (14)CNRS and University of Orléans, LPC2E, Orléans, France, (15)Finnish Meteorological Institute, Helsinki, Finland, (16)European Space Agency, Noordwijk, Netherlands, (17)RISE Research Institutes of Sweden, Stockholm, Sweden
Abstract:
Comets are believed to contain the most pristine material of our Solar System materials and therefore to be a key to understand the origin of the Solar System, and the origin of life. Remote sensing observations have led to the detection of more than twenty simple organic molecules (Bockelée-Morvan et al., 2004; Mumma and Charnley, 2011). Experiments on-board in-situ exploration missions Giotto and Vega and the recent Stardust sample return missions have shown that a significant fraction of the cometary grains consists of organic matter. Spectra showed that both the gaseous (Mitchell et al., 1992) and the solid phase (grains) (Kissel and Krueger, 1987) contained organic molecules with higher masses than those of the molecules detected by remote sensing techniques in the gaseous phase. Some of the grains analyzed in the atmosphere of comet 1P/Halley seem to be essentially made of a mixture of carbon, hydrogen, oxygen and nitrogen (CHON grains, Fomenkova, 1999). Rosetta is an unparalleled opportunity to make a real breakthrough into the nature of cometary matter, both in the gas and in the solid phase. The dust mass spectrometer COSIMA on Rosetta will analyze organic and inorganic phases in the dust. The organic phases may be refractory, but some organics may evaporate with time from the dust and lead to an extended source in the coma. Over the last years, we have prepared the cometary rendezvous by the analysis of various samples with the reference model of COSIMA. We will report on this calibration data set and on the first results of the in-situ analysis of cometary grains as captured, imaged and analyzed by COSIMA.

References :

Bockelée-Morvan, D., et al. 2004. (Eds.), Comets II. the University of Arizona Press, Tucson, USA, pp. 391-423 ; Fomenkova, M.N., 1999. Space Science Reviews 90, 109-114 ; Kissel, J., Krueger, F.R., 1987. Nature 326, 755-760 ; Mitchell, et al. 1992. Icarus 98, 125-133 ; Mumma, M.J., Charnley, S.B., 2011. Annual Review of Astronomy and Astrophysics 49, 471-524.

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