Keywords :
comets general - comets: individual: C/2020 F3 - radio lines: planetary systems - radio continuum: planetary systems - submillimeter: planetary systems
Abstract:We present the results of millimetre-wave spectroscopic and continuum observations of comet C/2020 F3 (NEOWISE) undertaken with the Institut de RadioAstronomie Millimetrique (IRAM) 30-m and the NOrthern Extended Millimeter Array (NOEMA) telescopes on 22, 25-27 July and 7 August 2020. Production rates of HCN, HNC, CH_3_OH, CS, H_2_CO, CH_3_CN, H_2_S, and CO were determined with upper limits on 6 others species. The comet shows abundances within the range observed in other comets. The CO abundance is low (3.2% relative to water) while H_2_S is relatively abundant (1.1% relative to water). The H_2_CO abundance shows a steep variation with heliocentric distance, possibly related to a distributed production from the dust or macro-molecular source.
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