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NaCl and KCl in Io’s Atmosphere

Redwing, Erin and de Pater, Imke and Luszcz-Cook, Statia and de Kleer, Katherine and Moullet, Arielle and Rojo, Patricio M. (2022) NaCl and KCl in Io’s Atmosphere. Planetary Science Journal, 3 (10). Art. No. 238. ISSN 2632-3338. doi:10.3847/psj/ac9784.

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We present the first comprehensive study of NaCl and KCl gases in Io’s atmosphere in order to investigate their characteristics and infer properties of Io’s volcanoes and subsurface magma chambers. In this work, we compile all past spectral line observations of NaCl and KCl in Io's atmosphere from the Atacama Large Millimeter/submillimeter Array and use atmospheric models to constrain the physical properties of the gases on several dates between 2012 and 2018. NaCl and KCl appear to be largely spatially confined, and for observations with high spectral resolution, the temperatures are high (∼500–1000 K), implying a volcanic origin. The ratio of NaCl:KCl was found to be ∼5–6 in 2015 June and ∼3.5–10 in 2016 June, which is consistent with predictions based on observations of Io's extended atmosphere and less than half the Na/K ratio in chondrites. Assuming these gases are volcanic in origin, these ratios imply a magma temperature of ∼1300 K, such that the magma will preferentially outgas KCl over NaCl.

Item Type:Article
Related URLs:
URLURL TypeDescription
Redwing, Erin0000-0002-5595-3808
de Pater, Imke0000-0002-4278-3168
Luszcz-Cook, Statia0000-0001-9867-9119
de Kleer, Katherine0000-0002-9068-3428
Moullet, Arielle0000-0002-9820-1032
Rojo, Patricio M.0000-0002-1607-6443
Additional Information:This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00779.S, ADS/JAO.ALMA#2012.1.00853.S, ADS/JAO.ALMA#2015.1.00995.S, and ADS/JAO.ALMA#2017.1.00670.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. All data can be downloaded from the ALMA Archive. This research was supported by the National Science Foundation. Facility: ALMA. -
Group:Division of Geological and Planetary Sciences, Astronomy Department
Funding AgencyGrant Number
Issue or Number:10
Record Number:CaltechAUTHORS:20230203-893794600.50
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:119042
Deposited By: Research Services Depository
Deposited On:10 Feb 2023 17:31
Last Modified:10 Feb 2023 17:32

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