Search for S2 in the IUE Spectra of Comet Hyakutake (1996 B2)

Details Search for S2 in the IUE Spectra of Comet Hyakutake (1996 B2) Search for S2 in the IUE Spectra of Comet Hyakutake (1996 B2)

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0932l&link_type=abstract

American Astronomical Society, DPS meeting #28, #09.32; Bulletin of the American Astronomical Society, Vol. 28, p.1094

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The main features of cometary spectra in the 250-330 nm range of the LWP camera of IUE are the CS(0,0) and (0,1) bands, OH(0,0), (1,1),and (0,1) bands, and CO2+ at 289 nm. Observations of Comet Hyakutake were performed from February 19, 1996 to the end of March. An exposure time as long as 3600 s could be achieved on March 27, despite a difficult tracking problem, due to the large proper motion of the comet. A careful search for S2 is performed using a synthetic spectrum having the same spectral resolution as IUE (1.1 nm). The fluorescence spectrum of S2 is calculated in solving the evolution equation for the population of the vibrational levels of S2 as a function of time. The method uses a (33x33) matrix inversion. Coincidences between measured and calculated spectra are observed at 286.1, 292.2, 298.6 nm, and maybe 295.6, 302 nm. A synopsis of the interactions between the various sulfur compounds that have been detected or probably exist in comets (CS, S2, H2S, COS...), is presented. The detection of S2 in Comet Hyakutake is a consequence of the short distance from the comet to Earth. This was also the case for Comet IRAS-Araki-Alcock. The S2 molecule might also be present in comets on a frequent basis and be detectable if the geocentric distance is sufficiently short.

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