Nevertheless, more work is still required to confirm if the flaring period of J1122+25 is really an indication of its rotation period. If J1122+25 is indeed rotating once every ~17 minutes, then its rotation velocity is likely to be much greater than 100 km/s. A Jupiter-sized brown dwarf with less than 80 times the mass of Jupiter can have a rotation period as short as ~20 minutes. In the case of J1122+25, its short rotation period of only ~17 minutes means that it has to be less than ~90 percent the size of Jupiter for it not to break apart.
Route & Wolszczan (2016), "Radio Flaring from the T6 Dwarf WISEPC J112254.73+255021.5 with A Possible Ultra-short Periodicity", arXiv:1604.04543 [astro-ph.SR]