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Radio observations of young stellar objects (YSOs) enable the study ofionised plasma outflows from young protostars via their free-free radiation.Previous studies of the low-mass young system T Tau have used radioobservations to model the spectrum and estimate important physical propertiesof the associated ionised plasma (local electron density, ionised gas contentand emission measure). However, without an indication of the low-frequencyturnover in the free-free spectrum, these properties remain difficult toconstrain. This paper presents the detection of T Tau at 149 MHz with the LowFrequency Array (LOFAR) - the first time a YSO has been observed at such lowfrequencies. The recovered total flux indicates that the free-free spectrum maybe turning over near 149 MHz. The spectral energy distribution is fitted andyields improved constraints on local electron density ($(7.2 \pm2.1)\times10^{3}$ cm$^{-3}$), ionised gas mass ($(1.0 \pm 1.8)\times10^{-6}$M$_{\odot}$) and emission measure ($(1.67 \pm 0.14)\times10^5$ pc cm$^{-6}$).

A LOFAR detection of the low mass young star T Tau at 149 MHz