Seasonal exposure of carbon dioxide ice on the nucleus of comet 67P/Churyumov-Gerasimenko.
作者： GIANRICO Filacchione , Andrea Raponi , FABRIZIO Capaccioni , Mauro Ciarniello , Federico Tosi
关键词: Carbon dioxide 、 Nucleus 、 Volatility (chemistry) 、 Atmospheric sciences 、 Astrobiology 、 Environmental science 、 Surface layer 、 Comet nucleus 、 Infrared
摘要: Carbon dioxide (CO 2 ) is one of the most abundant species in cometary nuclei, but because its high volatility, CO ice generally only found beneath surface. We report infrared spectroscopic identification a ice–rich surface area located Anhur region comet 67P/Churyumov-Gerasimenko. Spectral modeling shows that about 0.1% 80- by 60-meter ice. This exposed was observed short time after exited local winter; following increased illumination, completely disappeared over 3 weeks. estimate mass sublimated and depth eroded layer. interpret presence as result extreme seasonal changes induced rotation orbit comet.
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