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Detecting and mapping HCN on Saturn using ALMA

Presentation #508.04 in the session Origin and Evolution of Giant Planet Systems II (Oral Presentation)

Published onOct 23, 2023
Detecting and mapping HCN on Saturn using ALMA

We will present analysis of the HCN (5-4) line detected on Saturn using ALMA project 2017.1.00636.S that took place on May 25, 2018. The project combined seven pointings of the main array in configuration C43.2 and three pointings of the ACA to mosaic the full disk of the planet. The HCN (5-4) line is detected at the limb of the planet only, from the equator up to the south and north polar regions. The HCN line was used by Benmahi et al. (2022, A&A 666, A117) to provide the first absolute wind measurements in Saturn’s stratosphere. In this presentation, we will present the retrieved HCN stratospheric abundance from the equator to the polar regions, and discuss the retrieved abundance in the context of the ring rain detected in situ by Cassini and the specific nitrogen chemistry revealed in Jupiter’s polar regions (Cavalié et al. 2023, Nat. Astro, in press).

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