Water masers in the Saturnian system

Details Water masers in the Saturnian system Water masers in the Saturnian system

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...494l...1p&link_type=abstract

Astronomy and Astrophysics, Volume 494, Issue 2, 2009, pp.L1-L4

Astronomy and Astrophysics

Astrophysics

3

Masers, Radio Lines: Solar System, Planets And Satellites: General

Scientific paper

Context: The presence of water has long been seen as a key condition for life in planetary environments. The Cassini spacecraft discovered water vapour in the Saturnian system by detecting absorption of UV emission from a background star. Investigating other possible manifestations of water is essential, one of which, provided physical conditions are suitable, is maser emission. Aims: We report detection of water maser emission at 22 GHz associated with several Kronian satellites using Earth-based radio telescopes. Methods: We searched for water maser emission in the Saturnian system in an observing campaign using the Metsähovi and Medicina radio telescopes. Spectral data were Doppler-corrected over orbital phase for the Saturnian satellites, yielding detections of water maser emission associated with the moons Hyperion, Titan, Enceladus, and Atlas. Results: The detection of Saturnian water molecules by remote astronomical observation can be combined with in situ spacecraft measurements to harmonise the physical model of the Saturnian system.

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