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Catalogue POP – Notice individuelle de publication

Merlin Frédéric, Guilbert Aurélie, Dumas Christophe, Barucci Maria Antonella, De Bergh Catherine, Vernazza Pierre

Properties of the icy surface of the TNO 136108 (2003 EL{61})

Astronomy and Astrophysics, 2007, vol. 466, pp. 1185-1188

Référence ADS : 2007A&A...466.1185M

Résumé :

Context: Spectroscopic observations of numerous trans-Neptunian objects (TNOs), considered to be among the most pristine objects of the solar system, have revealed the presence of several kinds of surface ices. The high-sensitivity spectra that can be measured for the brightest objects also provide constraints on the physical properties of the surface (e.g. ice phase, temperature). <BR />Aims: We observed one of the largest and brightest TNOs, 136108 (2003 EL{61}), to determine its surface composition properties and to constrain its surface properties. <BR />Methods: We obtained new visible spectra with EMMI on the ESO-NTT and near-infrared spectra with the new 3D spectrograph SINFONI at the ESO-VLT. Our analysis consists of radiative transfer modelling to constrain composition and surface properties and to identify the precise minimum of the 1.65 micron band to constrain the surface temperature. <BR />Results: The observations reveal a surface essentially composed of water ice. An absorption feature at 1.65 micron clearly indicates the presence of ice in the crystalline phase. Spectral modelling suggests that a small fraction of the surface ice is in the amorphous state. We also derive the temperature of the crystalline ice at the surface.

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