text: 360,58,1230407626862858241,281711973,Dr. Emily Rickman,Today I have a new paper up on arXiv👇of a new benchmark brown dwarf😱 <LINK> We followed up some previously detected giant planets & low-mass brown dwarfs from CORALIE (<LINK>) with VLT/SPHERE @SPHERE_outreach & LOOK HOW BEAUTIFUL IT IS 🔭✨ <LINK> @SPHERE_outreach But what is even cooler is that we have can look at its atmosphere and we see indicators of methane and water 😃🌟 Detections like these are vital for calibrating atmospheric models of ultracool objects & act as analogues towards understanding exoplanetary atmospheres 🪐⭐️🔭 <LINK> @ClaireEsau @SPHERE_outreach This!! I'm just writing up my thesis now & someone said to me the other day you have to think of it as a snapshot in time of where your research currently is rather than a complete A-Z of every problem solved. I like this way of thinking.,https://arxiv.org/abs/2002.08319,"Context. HD13724 is a nearby solar-type star at 43.48 $\pm$ 0.06 pc hosting a long-period low-mass brown dwarf detected with the CORALIE echelle spectrograph as part of the historical CORALIE radial-velocity search for extra-solar planets. 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 a suitable target for further characterisation with high-contrast imaging, in particular to measure its inclination, mass, and spectrum and thus establish its substellar nature. Aims. Using high-contrast imaging with the SPHERE instrument on the Very Large Telescope (VLT), we are able to directly image a brown dwarf companion to HD13724 and obtain a low-resolution spectrum. Methods. We combine the radial-velocity measurements of CORALIE and HARPS taken over two decades and high contrast imaging from SPHERE to obtain a dynamical mass estimate. From the SPHERE data we obtain a low resolution spectrum of the companion from Y to J band, as well as photometric measurements from IRDIS in the J, H and K bands. Results. Using high-contrast imaging with the SPHERE instrument at the VLT, we report the first images of a brown dwarf companion to the host star HD13724. It has an angular separation of 175.6 $\pm$ 4.5 mas and H-band contrast of $10.61\pm0.16$ mag and, using the age estimate of the star to be $\sim$1 Gyr, gives an isochronal mass estimate of $\sim$44 $M_{\mathrm{Jup}}$. By combining radial-velocity and imaging data we also obtain a dynamical mass of $50.5^{+3.3}_{-3.5} M_{\mathrm{Jup}}$. Through fitting an atmospheric model, we estimate a surface gravity of $\log g = 5.5$ and an effective temperature of 1000K. A comparison of its spectrum with observed T dwarfs estimates a spectral type of T4 or T4.5, with a T4 object providing the best fit. ","Spectral and atmospheric characterisation of a new benchmark brown dwarf