LrgpV1, Main, Exploration, bibRecord, 000733

The Nitrogen Chemistry in Hot Jupiters Atmosphere

Identifieur interne : 000733 ( Main/Exploration ); précédent : 000732; suivant : 000734

The Nitrogen Chemistry in Hot Jupiters Atmosphere

Auteurs : O. Venot [France] ; Eric Hébrard [France] ; Marcelino Agúndez ; M. Dobrijevic [France] ; Franck Selsis [France] ; F. Hersant [France] ; Nicolas Iro [États-Unis] ; Roda Bounaceur [France]

Source :

RBID : Hal:hal-01169698

Abstract

The atmosphere of hot Jupiters can be probed by primary transit andsecondary eclipse spectroscopy. In order to constrain the atmospheric thermalstructure and composition from observables, chemical models are necessary. Dueto the intense UV irradiation, mixing and circulation, the chemical composition ismaintained out of equilibrium and kinetic photochemical models must be appliedwith kinetics valid at the high temperatures prevailing in hot Jupiters atmospheres.We study the steady state atmospheric composition of HD 189733b one of themost observed hot Jupiters by implementing a new kinetic network in a 1D time-dependent chemical model including photodissociations and vertical diffusion. Weconfirm that the atmospheric composition of the planet is maintained out of theequilibrium by photodissociations and vertical quenching. The core and noveltyof this study is the chemical scheme. It was produced in close collaboration withexperts of applied high-temperature kinetics and methodically validated over arange of temperatures and pressures typical of the atmospheric layers influencingthe observations of hot Jupiters. In addition to our nominal chemical scheme, weimplemented other reaction sub-networksfor nitrogen-bearing species that are commonly used in the field of combustion, and investigate the sensitivity of thepredicted abundances and spectra to the network. We found that the abundances ofNH3and HCN can vary by 2 orders of magnitude. A spectral feature of NH3at10.5μm is sensitive to these abundance variations and thus to the chemical scheme.

Url:

https://hal.archives-ouvertes.fr/hal-01169698

Affiliations:

Links toward previous steps (curation, corpus...)

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Le document en format XML

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<author><name sortKey="Bounaceur, Roda" sort="Bounaceur, Roda" uniqKey="Bounaceur R" first="Roda" last="Bounaceur">Roda Bounaceur</name>
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<front><div type="abstract" xml:lang="en">The  atmosphere of  hot  Jupiters  can  be  probed by primary transit  andsecondary  eclipse  spectroscopy.  In  order  to  constrain  the  atmospheric  thermalstructure and composition from observables, chemical models are necessary. Dueto the intense UV irradiation, mixing and circulation, the chemical composition ismaintained out of equilibrium and kinetic photochemical models must be appliedwith kinetics valid at the high temperatures prevailing in hot Jupiters atmospheres.We  study  the  steady  state  atmospheric  composition  of  HD  189733b  one  of  themost observed hot Jupiters by implementing a new kinetic network in a 1D time-dependent chemical model including photodissociations and vertical diffusion. Weconfirm that  the  atmospheric composition of  the  planet is  maintained out  of  theequilibrium by  photodissociations and  vertical  quenching. The  core  and  noveltyof this study is the chemical scheme. It was produced in close collaboration withexperts  of  applied  high-temperature  kinetics  and  methodically  validated  over  arange of temperatures and pressures typical of the atmospheric layers influencingthe observations of hot Jupiters. In addition to our nominal chemical scheme, weimplemented  other   reaction  sub-networksfor  nitrogen-bearing  species  that  are commonly used in the field  of combustion, and investigate the sensitivity of thepredicted abundances and spectra to the network. We found that the abundances ofNH3and HCN can vary by 2 orders of magnitude. A spectral feature of NH3at10.5μm is sensitive to these abundance variations and thus to the chemical scheme.</div>
</front>
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   |texte=   The Nitrogen Chemistry in Hot Jupiters Atmosphere
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The Nitrogen Chemistry in Hot Jupiters Atmosphere

The Nitrogen Chemistry in Hot Jupiters Atmosphere

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