![Figure Caption: LIRIS (red dots) and NIRSPEC (black line) spectra of Pleiades proper motion candidates. The NIRSPEC spectrum of Calar 21 is normalized to the K-band LIRIS spectrum. The left panel illustrates the comparison of the Pleiades data with field, Figure Caption: LIRIS (red dots) and NIRSPEC (black line) spectra of Pleiades proper motion candidates. The NIRSPEC spectrum of Calar 21 is normalized to the K-band LIRIS spectrum. The left panel illustrates the comparison of the Pleiades data with field,](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/resultados142_154.jpg?itok=5MUB2JKW)
We report on the near-infrared low-resolution spectroscopy and red optical (Z-band) photometry of seven proper-motion, very low-mass substellar member candidates of the Pleiades cluster with magnitudes in the interval J=17.5-20.8 and K=16.1-18.5 mag. Spectra were acquired for six objects with the LIRIS and NIRSPEC instruments mounted on the 4.2-m WHT and the 10-m Keck II telescopes. Z-band images of two of the faintest candidates were collected with ACAM/WHT. The new data confirm the low temperatures of all seven Pleiades candidates. From the imaging observations, we find extremely red Z-J
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