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We report the detection of a molecular outflow driven by the brown dwarfbinary FU Tau. Using the IRAM 30 m telescope we observed the $^{12}$CO(2-1)(CO) emission in the vicinity of FU Tau and detected a bipolar outflow byexamining the wings of the CO(2-1) line as we moved away from the sourceposition. An integrated map of the wing emission between 3 kms$^{-1}$ and 5kms$^{-1}$ reveals a blue-shifted lobe at a position of $\sim$ 20 \arcsec\ fromthe FU Tau system and at a position angle of $\sim$ 20$^{\circ}$. The beam sizeof the observations is $11\arcsec$\ hence it is not possible to distinguishbetween the two components of the FU Tau binary. However as optical forbiddenemission, a strong tracer of the shocks caused by outflow activity, has beendetected in the spectrum of FU Tau A we assume this component to be the drivingsource of the molecular outflow. We estimate the mass and mass outflow rate ofthe outflow at 4 $\times$ 10$^{-6}$ \Msun\ and 6 $\times$ 10$^{-10}$ \Msun/yrrespectively. These results agree well with previous estimates for BD molecularoutflows. FU Tau A is now the third BD found to be associated with molecularoutflow activity and this discovery adds to the already extensive list of theinteresting properties of FU Tau.

A molecular outflow driven by the brown dwarf binary FU Tau