Context. Radio data obtained for the ultracool dwarf TVLM 513-46546 has indicated a rotation period of approximate to 1.96 h via regular radio pulses, but how stable is this period. This has major implications regarding ...

Context. Recently, unanticipated magnetic activity in ultracool dwarfs (UCDs, spectral classes later than M7) has emerged from a number of radio observations. The highly (up to 100%) circularly polarized nature and high ...