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About a dozen substellar companions orbiting young stellar objects orpre-main sequence stars at several hundred au have been identified in the lastdecade. These objects are interesting both due to the uncertainties surroundingtheir formation, and because their large separation from the host star offersthe potential to study the atmospheres of young giant planets and brown dwarfs.Here, we present X-shooter spectroscopy of SR 12 C, a $\sim\,2\,$Myrs youngbrown dwarf orbiting SR 12 at an orbital separation of 1083 au. We determinethe spectral type, gravity, and effective temperature via comparison withmodels and observational templates of young brown dwarfs. In addition, wedetect and characterize accretion using several accretion tracers. We find SR12 C to be a brown dwarf of spectral type L0 $\pm$ 1, $\log$ g = 4 $\pm$ 0.5,an effective temperature of 2600 $\pm$ 100 K. Our spectra provide clearevidence for accretion at a rate of $\sim$ $10^{-10}$ $M_{\odot}yr^{-1}$. Thismakes SR 12 one of the few sub-stellar companions with a reliable estimate forits accretion rate. A comparison of the ages and accretion rates of sub-stellarcompanions with young isolated brown dwarfs does not reveal any significantdifferences. If further accretion rate measurements of a large number ofsubstellar companions can confirm this trend, this would hint towards a similarformation mechanism for substellar companions at large separations and isolatedbrown dwarfs.

Accretion signatures in the X-shooter spectrum of the substellar companion to SR12