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Context. HD13724 is a nearby solar-type star at 43.48 $\pm$ 0.06 pc hosting along-period low-mass brown dwarf detected with the CORALIE echelle spectrographas part of the historical CORALIE radial-velocity search for extra-solarplanets. The companion has a minimum mass of $26.77^{+4.4}_{-2.2}M_{\mathrm{Jup}}$ and an expected semi-major axis of $\sim$ 240 mas making it asuitable target for further characterisation with high-contrast imaging, inparticular to measure its inclination, mass, and spectrum and thus establishits substellar nature. Aims. Using high-contrast imaging with the SPHEREinstrument on the Very Large Telescope (VLT), we are able to directly image abrown dwarf companion to HD13724 and obtain a low-resolution spectrum. Methods.We combine the radial-velocity measurements of CORALIE and HARPS taken over twodecades and high contrast imaging from SPHERE to obtain a dynamical massestimate. From the SPHERE data we obtain a low resolution spectrum of thecompanion from Y to J band, as well as photometric measurements from IRDIS inthe J, H and K bands. Results. Using high-contrast imaging with the SPHEREinstrument at the VLT, we report the first images of a brown dwarf companion tothe host star HD13724. It has an angular separation of 175.6 $\pm$ 4.5 mas andH-band contrast of $10.61\pm0.16$ mag and, using the age estimate of the starto be $\sim$1 Gyr, gives an isochronal mass estimate of $\sim$44$M_{\mathrm{Jup}}$. By combining radial-velocity and imaging data we alsoobtain a dynamical mass of $50.5^{+3.3}_{-3.5} M_{\mathrm{Jup}}$. Throughfitting an atmospheric model, we estimate a surface gravity of $\log g = 5.5$and an effective temperature of 1000K. A comparison of its spectrum withobserved T dwarfs estimates a spectral type of T4 or T4.5, with a T4 objectproviding the best fit.

Spectral and atmospheric characterisation of a new benchmark brown dwarf HD13724B