Spectroscopic Observations of Comet C/1995 O1 (Hale-Bopp) with the Infrared Space Observatory

Details Spectroscopic Observations of Comet C/1995 O1 (Hale-Bopp) with the Infrared Space Observatory Spectroscopic Observations of Comet C/1995 O1 (Hale-Bopp) with the Infrared Space Observatory

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0921c&link_type=abstract

American Astronomical Society, DPS meeting #28, #09.21; Bulletin of the American Astronomical Society, Vol. 28, p.1092

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Comet C/1995 O1 (Hale-Bopp) was selected to be observed in the target-of-opportunity comet program of the Infrared Space Observatory (ISO). The first results of the spectroscopic part of this program are reported here. Comet Hale-Bopp was observed on 27 April 1996 with the ISOPHOT instrument of ISO when it was at 4.6 AU from the Sun. The 2.5--12 mu m spectrum was recorded at low resolution. The 2.5--5. mu m spectrum shows emission in the CO_2 nu_3 band at 4.26 mu m. Upper limits for other molecular bands (H_2O, CO, CH_3OH) are in agreement with observations of these species at other wavelengths. The CO_2 production rate is about 1.3 x 10(28) molecules s(-1) . This is about one third of the H_2O and CO production rates observed at other wavelengths, which indicates that carbon dioxide is an important constituant of cometary volatiles at this heliocentric distance. The 6--12 mu m spectrum shows thermal emission at a colour temperature of 162 K (6--8 mu m range) and a strong silicate band around 10 mu m, with a narrow feature at 11.2 mu m indicative of crystalline silicates. There is no indication of differences of composition for grains in comets Hale-Bopp and Halley. Comet Hale-Bopp is to be observed at higher spectral resolution with the SWS and LWS instruments of ISO in September-October 1996.

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