A ‘dry’ condensation origin for circumstellar carbonates

Alice Toppani (), François Robert, Guy Libourel, Philippe de Donato, Odile Barres, Louis d'Hendecourt and Jaafar Ghanbaja
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Alice Toppani: Centre de Recherches Pétrographiques et Géochimiques—CNRS UPR 2300
François Robert: Muséum National d'Histoire Naturelle
Guy Libourel: Centre de Recherches Pétrographiques et Géochimiques—CNRS UPR 2300
Philippe de Donato: Laboratoire Environnement et Minéralurgie—CNRS UMR 7569
Odile Barres: Laboratoire Environnement et Minéralurgie—CNRS UMR 7569
Louis d'Hendecourt: Université Paris-Sud
Jaafar Ghanbaja: Faculté des Sciences—Université Henri Poincaré, Nancy I

Nature, 2005, vol. 437, issue 7062, 1121-1124

Abstract: Water surprise Planetary scientists generally consider carbonates to be a good indication of — at one time or another — the presence of liquid water. On Mars, the geology confirms that the water was there. But a new experiment suggests that the future detection of carbonates around a young star will not necessarily imply the presence of bodies that have had liquid water. Performed in a reaction chamber that mimics circumstellar environments, the experiment shows that carbonates and amorphous silicates can form when a silicate gas condenses in the presence of water vapour and carbon dioxide: no liquid water is necessary.

Date: 2005
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DOI: 10.1038/nature04128

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