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We report on a search for variability in the young brown dwarf SST1624 (~M7spectral type, M~0.05Msol), previously found to feature an expanding gaseousshell and to undergo quasi-spherical mass loss. We find no variability ontimescales of 1-6hours. Specifically, on these timescales, we rule out thepresence of a period with amplitude >1%. A photometric period in that rangewould have been evidence for either pulsation powered by Deuterium burning orrotation near breakup. However, we see a 3% decrease in the K-band magnitudebetween two consecutive observing nights (a 10sigma result). There is alsoclear evidence for variations in the WISE lightcurves at 3.6 and 4.5 microns ontimescales of days, with a tentative period of 6d, and potentially long-termvariations over time windows of years. The best explanation for the variationsover days is rotational modulation due to spots. These results disfavourcentrifugal winds driven by fast rotation as mechanism for the mass loss,which, in turn, makes the alternative scenario -- a thermal pulse due toDeuterium burning -- more plausible.

Variability in SSTc2d J163134.1-240100, a brown dwarf with quasi-spherical mass loss