Evidence for rapid evolution of periodic variations in an ultracool dwarf

Abstract

The results of three short photometric monitoring runs on the L0 dwarf 2MASS J06050196−2342270, during three consecutive nights, are presented. The observations show the persistent presence of a 2.4-h period, with an IC band amplitude which decreased from 27 to 11 mmag over the three nights. The amplitude in the RC band appeared to be substantially smaller than in the IC band.