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Report by: J. Wink, R. Lucas, S. Guilloteau and A. Dutrey
IRAM, Grenoble
We report here the detection of HCN J=1-0 after the crash of the comet
Shoemaker-Levy 9 on Jupiter. The observations were performed with the
IRAM Interferometer from July 16th to July 24th. Since Jupiter was
strongly resolved by the interferometer beam but not by the primary
beam, we chose to observe the planet center and we applied a very
specific data reduction method. First, Jupiter was used to calibrate
the radio frequency passband and the relative phase. Then the
amplitude was calibrated by fitting spline functions to Jupiter
visibilities. The data phases were then corrected for the position
offset from the planet center to the impact site. To correct for
residual instrumental ripples in the phase
passband of the system, we finally added to the impact data, the data
corresponding to the symmetrical point with respect to the planet center.
Figure 1: Plateau de Bure Interferometer J=1-0 HCN emission (Jy) observed on Fragment A
on July 20th 1994. The geocentric velocities are corrected from
Jupiter rotation.
In fig. 1, we present some preliminary results concerning
fragment A on July 20th. The HCN J=1-0 line appears in emission and
is particularly narrow: 
kms
. Comparison with the
HCN J=4-3 emission observed at the JCMT implies an optically thin
J=1-0 line.
Robert Lucas
Thu Mar 9 12:42:24 MET 1995