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Herschel/HIFI observations of Mars: first detection of O_2 at submillimetre wavelengths and upper limits on HCl and H_2O_2

We report on an initial analysis of Herschel/HIFI observations of hydrogen chloride (HCl), hydrogen peroxide (H_2O_2), and molecular oxygen (O_2) in the Martian atmosphere performed on 13 and 16 April 2010 (L_s ~ 77°). We derived a constant volume mixing ratio of 1400 +/- 120 ppm for O_2 and determined upper limits of 200 ppt for HCl and 2 ppb for H_2O_2. Radiative transfer model calculations indicate that the vertical profile of O_2 may not be constant. Photochemical models determine the lowest values of H_2O_2 to be around L_s ~ 75° but overestimate the volume mixing ratio compared to our measurements.

preprint2010arXivOpen access
P. HartoghC. JarchowE. LellouchM. de Val-BorroM. RengelR. MorenoA. S. MedvedevH. SagawaB. M. SwinyardT. CavaliéD. C. LisM. I. BłęckaM. BanaszkiewiczD. Bockelée-MorvanJ. CrovisierT. EncrenazM. KüppersL. -M. LaraS. SzutowiczB. VandenbusscheF. BenschE. A. BerginF. BillebaudN. BiverG. A. BlakeJ. A. D. L. BlommaertJ. CernicharoL. DecinP. EncrenazH. FeuchtgruberT. FultonT. de GraauwE. JehinM. KidgerR. LorenteD. A. NaylorG. PortyankinaM. Sánchez-PortalR. SchiederS. SidherN. ThomasE. VerdugoC. WaelkensN. WhybornD. TeyssierF. HelmichP. RoelfsemaJ. StutzkiH. G. LeDucJ. A. Stern
astro-ph.EP
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P. HartoghC. JarchowE. LellouchM. de Val-BorroM. RengelR. MorenoA. S. MedvedevH. SagawaB. M. SwinyardT. CavaliéD. C. LisM. I. BłęckaM. BanaszkiewiczD. Bockelée-MorvanJ. CrovisierT. EncrenazM. KüppersL. -M. LaraS. SzutowiczB. VandenbusscheF. BenschE. A. BerginF. BillebaudN. BiverG. A. BlakeJ. A. D. L. BlommaertJ. CernicharoL. DecinP. EncrenazH. FeuchtgruberT. FultonT. de GraauwE. JehinM. KidgerR. LorenteD. A. NaylorG. PortyankinaM. Sánchez-PortalR. SchiederS. SidherN. ThomasE. VerdugoC. WaelkensN. WhybornD. TeyssierF. HelmichP. RoelfsemaJ. StutzkiH. G. LeDucJ. A. Stern

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