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COMETARY SCIENCE. Organic compounds on comet 67P/Churyumov-Gerasimenko revealed by COSAC mass spectrometry.

Fred Goesmann, Helmut Rosenbauer, Jan Hendrik Bredehöft, Michel Cabane, Pascale Ehrenfreund, Thomas Gautier, Chaitanya Giri, Harald Krüger, Léna Le Roy, Alexandra J MacDermott, Susan McKenna-Lawlor, Uwe J Meierhenrich, Guillermo M Muñoz Caro, Francois Raulin, Reinhard Roll, Andrew Steele, Harald Steininger, Robert Sternberg, Cyril Szopa, Wolfram Thiemann, Stephan Ulamec
Science 2015 July 32
Comets harbor the most pristine material in our solar system in the form of ice, dust, silicates, and refractory organic material with some interstellar heritage. The evolved gas analyzer Cometary Sampling and Composition (COSAC) experiment aboard Rosetta's Philae lander was designed for in situ analysis of organic molecules on comet 67P/Churyumov-Gerasimenko. Twenty-five minutes after Philae's initial comet touchdown, the COSAC mass spectrometer took a spectrum in sniffing mode, which displayed a suite of 16 organic compounds, including many nitrogen-bearing species but no sulfur-bearing species, and four compounds—methyl isocyanate, acetone, propionaldehyde, and acetamide—that had not previously been reported in comets.

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