Ministerio de Economía y Competitividad Gobierno de Canarias Universidad de La Laguna CSIC Centro de Excelencia Severo Ochoa

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GTC OSIRIS z-band imaging of Y dwarfs.

Author/s: N Lodieu, V Sanchez Bejar, R Rebolo

Reference: Lodieu et al. 2013, A&A, 750, L2

Image en banda z of a Y dwarf, WISE1217+1626. The red circle indicates the position of the Y dwarf on the GTC image whereas the black circle denominates the position of the discovery image.
Image en banda z of a Y dwarf, WISE1217+1626. The red circle indicates the position of the Y dwarf on the GTC image whereas the black circle denominates the position of the discovery image.

The aim of the project is to contribute to the characterisation of the spectral energy distribution of the coolest brown dwarfs discovered to date, the Y dwarfs.
We obtained z-band far-red imaging for six Y dwarfs and a T9+Y0 binary with the OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy) instrument on the 10.4-m Gran Telescopio de Canarias (GTC).
We detect five of the seven known Y dwarfs in the z-band, infer theioptical-to-infrared colours, and measure their proper motions. We find a higher dispersion in the z-J and z-H colours of Y0 dwarfs than in T dwarfs. This dispersion is found to be correlated with H-w2 The high dispersion in the optical-to-infrared colours of Y dwarfs and the possible turn-over towards bluer colours may be a consequence of the presence of sulfide clouds with different thicknesses, the depletion of alcalines, and/or gravity effects.

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