Astronomy & Astrophysics manuscript no. main c ESO 2018 October 22, 2018 High-contrast observations of 136108 Haumea? A crystalline water-ice multiple system C. Dumas1, B. Carry2;3, D. Hestroffer4, and F. Merlin2;5 1 European Southern Observatory. Alonso de Cordova´ 3107, Vitacura, Casilla 19001, Santiago de Chile, Chile e-mail:
[email protected] 2 LESIA, Observatoire de Paris, CNRS. 5 place Jules Janssen, 92195 Meudon CEDEX, France e-mail:
[email protected] 3 European Space Astronomy Centre, ESA. P.O. Box 78, 28691 Villanueva de la Canada,˜ Madrid, Spain 4 IMCCE, Observatoire de Paris, CNRS. 77, Av. Denfert-Rochereau, 75014 Paris, France e-mail:
[email protected] 5 Universit Paris 7 Denis Diderot. 4 rue Elsa Morante, 75013 Paris, France e-mail:
[email protected] Received 2010 May 18 / Accepted 2011 January 6 ABSTRACT Context. The trans-neptunian region of the Solar System is populated by a large variety of icy bodies showing great diversity in orbital behavior, size, surface color and composition. One can also note the presence of dynamical families and binary systems. One surprising feature detected in the spectra of some of the largest Trans-Neptunians is the presence of crystalline water-ice. This is the case for the large TNO (136 108) Haumea (2003 EL61). Aims. We seek to constrain the state of the water ice of Haumea and its satellites, and investigate possible energy sources to maintain the water ice in its crystalline form. Methods. Spectro-imaging observations in the near infrared have been performed with the integral field spectrograph SINFONI mounted on UT4 at the ESO Very Large Telescope.