[en] There are hints that the dwarf planet (1) Ceres may contain a large amount of water ice. Some models and previous observations suggest that ice could be close enough to the surface to create a flux of water outward through the regolith. This work aims to confirm a previous detection of OH emission off the northern limb of Ceres with the International Ultraviolet Explorer (IUE). Such emission would be evidence of water molecules escaping from the dwarf planet. We used the Ultraviolet and Visual Echelle Spectrograph of the Very Large Telescope to obtain spectra off the northern and southern limbs of Ceres at several epochs. These spectra cover the 307-312 nm wavelength range corresponding to the OH (0,0) emission band, which is the brightest band of this radical, well known in the cometary spectra. These new observations, five times more sensitive than those from IUE, did not permit detection of OH around Ceres. We derive an upper limit for the water production of about ~7 × 10[SUP]25[/SUP] molecules s[SUP]-1[/SUP] and estimate the minimum thickness of the dust surface layer above the water ice layer (if present) to be about 20 m. .
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rousselot, P.; Observatoire de Besançon, Institut UTINAM-UMR CNRS 6213, University of Franche-Comté, BP 1615, 25010 Besançon Cedex, France
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Manfroid, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Mousis, O.; Observatoire de Besançon, Institut UTINAM-UMR CNRS 6213, University of Franche-Comté, BP 1615, 25010 Besançon Cedex, France
Dumas, C.; European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile
Carry, B.; European Space Astronomy Centre, ESA, P.O. Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
Marboeuf, U.; Institut de Planétologie et d'Astrophysique de Grenoble, Université Joseph Fourier, CNRS INSU, France
Zucconi, J*-M; Observatoire de Besançon, Institut UTINAM-UMR CNRS 6213, University of Franche-Comté, BP 1615, 25010 Besançon Cedex, France ; Deceased.
Language :
English
Title :
A Search for Water Vaporization on Ceres
Publication date :
01 October 2011
Journal title :
Astronomical Journal
ISSN :
0004-6256
eISSN :
1538-3881
Publisher :
Univ Chicago Press, Chicago, United States - Illinois
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
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