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2019天文年會
國立自然科學博物館
5月17日至19日

論文摘要

(Sub)millimeter Molecular Observations of the Ceres Icy World

[ Oral ]

Yo-Ling Chuang(Earth Sciences, NTNU), Yi-Jehng Kuan(Earth Sciences, NTNU), Steven B. Charnley(Goddard Center for Astrobiology, NASA/GSFC), Ming-Chi Chung(Earth Sciences, NTNU), Yu-Fu Yeh(Earth Sciences, NTNU), Wei-Ling Tseng(Earth Sciences, NTNU)

Icy worlds in our Solar System such as Europa, Ganymede, Callisto, Enceladus and Titan are possessed of surface organics and have known subsurface oceans, hence are important astrobiologically. Other icy Solar-System bodies such as Ceres, Pluto, Triton and Dione are also considered candidates for ocean worlds. In particular, among these icy bodies, water vapor was detected from Ceres, the sole dwarf planet in the inner Solar System and the largest member in the Main Asteroid Belt, by Herschel infrared space telescope. Besides, data returned from the Dawn space mission suggest a subsurface layer of briny water ice, along with ammonia-rich clays, may exist on Ceres. We thus conducted ground-based observations with the James Clerk Maxwell Telescope (JCMT) and the Atacama Large Millimeter/submillimeter Array (ALMA) to search for molecular emission in Ceres’ exosphere. In this meeting, we will present new findings from our observations and discuss their astrobiological implications.