Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..245m&link_type=abstract
SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
Hundreds of radar-dark patches interpreted as lakes have been discovered in the north and south polar regions of Titan. We have estimated the composition of these lakes by using the direct abundance measurements from the Gas Chromatograph Mass Spectrometer (GCMS) aboard the Huygens probe and recent photochemical models based on the vertical temperature profile derived by the Huygens Atmospheric Structure Instrument (HASI). Thermodynamic equilibrium is assumed between the atmosphere and the lakes, which are also considered as nonideal solutions. We find that the main constituents of the lakes are ethane (C_2H_6) (˜ 76-79%), propane (C_3H_8) (˜ 7-8%), methane (CH_4) (˜ 5-10%), hydrogen cyanide (HCN) (˜ 2-3%), butene (C_4H_8) (˜ 1%), butane (C_4H_{10}) (˜ 1%) and acetylene (C_2H_2) (˜ 1%). The calculated composition of lakes is then substantially different from what has been expected from models elaborated prior to the exploration of Titan by the Cassini-Huygens spacecraft.
Cordier Daniel
Lavvas Panayiotis
Lunine Jonathan I.
Mousis Oliver
Vuitton Veronique
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