Does IRAS 16293-2422 contain a hot core? New interferometric results
  High angular resolution H2CO line observations have been carried out for the low mass proto-binary star IRAS 16293-2422 using the OVRO millimeter array. Simultaneous continuum observations reveal that the source most probably contains two accretion disks, less than 250 AU in size, through which matter is fed onto the stars. The observations suggest that the binary has cleared most of the material in the inner part of the envelope, out to the binary separation. The H2CO interferometer observations indicate the presence of large scale rotation roughly perpendicular to the large scale CO outflow associated with this source. The H2CO emission is dominated by the compact dense and hot (T>100 K) gas close to the positions of the continuum peaks. 
F. L. Schoeier, J. K. Jorgensen, E. F. van Dishoeck, G. A. Blake