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Constrains on CO vertical distribution on Neptune’s atmosphere from IRAM and Herschel observations

Presentation #323.05 in the session Uranus and Neptune Systems (Poster)

Published onOct 23, 2023
Constrains on CO vertical distribution on Neptune’s atmosphere from IRAM and Herschel observations

We present a joint analysis of IRAM-30m and Herschel/SPIRE observations on Neptune atmosphere to constraint the CO vertical distribution in both the troposphere and stratosphere. These disk-averaged observations were almost concomitant, within 1 year, between 2009 and 2010. Previous CO observations indicates the existence of both external and internal origin sources of CO in which the stratospheric CO results from a large cometary impact that occurred ~200 years ago (Lellouch et al. 2005). The IRAM-30m observations were performed on May 05th, 2009 and Jan. 08th, 2010 on Neptune atmosphere. Several tuning around the CO(2-1) rotational line at 230.538 GHz were used to characterize the very large absorption of CO (FWHM ~ 1 GHz), as well as its narrow emission (FWHM ~ 20 MHz). The Herschel/SPIRE observations were acquired within the Herschel solar system observations (HSSO) guaranteed time key program (Hartogh et al. 2009), and were observed in May/Jun 2010. The measured SPIRE spectra cover many CO lines transitions between wavenumber 18 to 51 cm-1 These spectra will be analyzed via a radiative transfer model, to constrain the mixing ratio of stratospheric and tropospheric CO. The results will be compared with other analyses (e.g. Lellouch et al 2005, Luszcz-Cook and de Pater 2013, Teanby et al 2019).

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