Detection of new strongly variable brown dwarfs in the L/T transition

摘要: *Abbreviated abstract* Context: Brown dwarfs in the spectral range L9-T3.5, within so called L/T transition, have been shown to be variable at higher amplitudes and with greater frequency than other field dwarfs. [...] Now, more variables such as these need discovered studied better constrain atmospheric models. This is also critical understand giant exoplanets shed light on a number of possible correlations between brown dwarf characteristics variability. Aims: In this work, we aim discover new strong by targeting ten previously unsurveyed Methods: We used NOTCam Nordic Optical Telescope observe 11 targets, types ranging from L9.5 T3.5, J-band Results: report first discoveries significant variability four out targets measuring peak-to-peak up 10.7 +- 0.4% J for T1 2MASS J22153705+2110554, which curve evolution 2017 2018 epochs. marginally detection variability, confirm that well known J01365662+0933473 still strongly three years after last reported epoch. Finally, present an extensive multi-epoch catalogue literature discuss are identifiable catalogue. Conclusions: significantly add variables, through Poisson statistics infer occurrence rate among L9-T3.5 40[+32-19]%, agreement previous estimates. The identified work excellently suited multi-wavelength observations dedicated probing 3D structure atmospheres.