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Protostellar and cometary detections of organohalogens

E. C. Fayolle ; K. I. Oberg ; J. K. Jorgensen ; K. Altwegg ; H. Calcutt ; H. S. P. Muller ; M. Rubin ; M. H. D. van der Wiel ; Per Bjerkeli (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; T. L. Bourke ; A. Coutens ; E. F. van Dishoeck ; M. N. Drozdovskaya ; R. T. Garrod ; N. F. W. Ligterink ; Magnus V. Persson (Institutionen för rymd-, geo- och miljövetenskap, Astronomi och plasmafysik) ; S. F. Wampfler
Nature Astronomy (2397-3366). Vol. 1 (2017), 10, p. 703-708.
[Artikel, refereegranskad vetenskaplig]

Organohalogens, a class of molecules that contain at least one halogen atom bonded to carbon, are abundant on the Earth where they are mainly produced through industrial and biological processes(1). Consequently, they have been proposed as biomarkers in the search for life on exoplanets(2). Simple halogen hydrides have been detected in interstellar sources and in comets, but the presence and possible incorporation of more complex halogen-containing molecules such as organohalogens into planet-forming regions is uncertain(3,4). Here we report the interstellar detection of two isotopologues of the organohalogen CH3Cl and put some constraints on CH3F in the gas surrounding the low-mass protostar IRAS 16293-2422, using the Atacama Large Millimeter/submillimeter Array (ALMA). We also find CH3Cl in the coma of comet 67P/Churyumov-Gerasimenko (67P/C-G) by using the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) instrument. The detections reveal an efficient pre-planetary formation pathway of organohalogens. Cometary impacts may deliver these species to young planets and should thus be included as a potential abiotical production source when interpreting future organohalogen detections in atmospheres of rocky planets.

Denna post skapades 2017-12-13.
CPL Pubid: 253742


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)
Institutionen för rymd-, geo- och miljövetenskap, Astronomi och plasmafysik


Astronomi, astrofysik och kosmologi

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