Left: VLA image of the VHS 1256–1257 field at X-band. The detected source is readily assigned to the M7.5 binary VHS 1256–1257 AB. The location of the (undetected) L7-object b is marked with a solid white box. The 3σ threshold detection is 9 μJy. The restoring beam, shown at the bottom left corner, is an elliptical Gaussian of 0.78 × 0.45 arcsec (PA −51°). At 15.8 pc, the separation between components AB and b corresponds to 128.4 AU. Right: VLA image of the VHS 1256–1257 field at L-band. A solid box, with size that of the X-band image, is centered at the position of the X-band detection. None of the VHS 1256–1257 components is detected at this frequency band. The 3σ threshold detection is 20 μJy. The two bright knots seen in the map at the NW correspond to known extragalactic radio sources. The restoring beam, shown at the bottom left corner, is an elliptical Gaussian of 5.66 × 3.38 arcsec (PA −12°).
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