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The determination of the fundamental properties (mass, separation, age,gravity and atmospheric properties) of brown dwarf companions allows us toinfer crucial informations on their formation and evolution mechanisms.Spectroscopy of substellar companions is available to date only for a limitednumber of objects (and mostly at very low resolution, R<50) because oftechnical limitations, i.e., contrast and angular resolution. We present mediumresolution (R=350), coronagraphic long-slit spectroscopic observations withSPHERE of two substellar companions, HD 1160 B and HD 19467 B. We found that HD1160 B has a peculiar spectrum that cannot be fitted by spectra in currentspectral libraries. A good fit is possible only considering separately the Y+Jand the H spectral band. The spectral type is between M5 and M7. We alsoestimated a T_eff of 2800-2900 K and a log(g) of 3.5-4.0 dex. The low surfacegravity seems to favour young age (10-20 Myr) and low mass (~20 M Jup ) forthis object. HD 19467 B is instead a fully evolved object with a T_eff of ~1000K and log g of ~5.0 dex. Its spectral type is T6+/-1.

Characterising brown dwarf companions with IRDIS long-slit spectroscopy: HD 1160 B and HD 19467 B