Astronomy and Astrophysics – Astrophysics
Scientific paper
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.
Avruch Ian M.
Cosmovici Cristiano B.
Elitzur Moshe
Gurvits Leonid I.
Maccaferri Giuseppe
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