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2020天文年會
中研院天文所 國際會議廳

論文摘要

Search for the Molecular Exosphere on Enceladus

[ Poster ]

Chia-Cheng Chiang (蔣佳呈)(Department of Earth Sciences, National Taiwan Normal University), Yi-Jehng Kuan (管一政)(Department of Earth Sciences, National Taiwan Normal University), Yo-Ling Chuang (莊幼玲)(Department of Earth Sciences, National Taiwan Normal University)Chien-Hsun, Li (李建勳)(Graduate Institute of Applied Physics, National Taiwan University), Hsien-Ju, Tsai(蔡顯如) (Department of Earth Sciences, National Taiwan Normal University), Guan-Ting, Su (蘇冠庭)(Department of Physics, National Taiwan Normal University)

Enceladus, a small icy moon of Saturn and approximately 500 km in size, has caught tremendous attention since the Cassini space probe found water plumes in the south polar region of the moon. This unexpected discovery of the plumes may imply the existence of an exosphere on Enceladus. Moreover, with measurements of the gravitational field and the physical libration, a global ocean beneath the ice shell of Enceladus is suggested as a source of the plume. To investigate the nature of Enceladus' exosphere, we made a series of observations with Atacama Large Millimeter/Submillimeter Array (ALMA) and imaged Enceladus successfully regardless the diminutive angular size of ~0''.08. In this meeting, we will present preliminary results of our work.