PFS/MEX limb observations of 4.3-µm CO2 non-LTE emission in the atmosphere of Mars

Giuranna, M.; Fonte, S.; Longobardo, A.; Sindoni, G.; Wolkenberg, P.; Formisano, V.

doi:10.1016/j.icarus.2018.06.018

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…To name a few examples within our own Solar system, in Earth's atmosphere, non-LTE effects are present with visible effects in the form of airglow emissions, as noted for vibrationally excited OH in Charters, Macdonald & Polanyi ( 1971 ), for which level populations have been measured (Noll et al 2020 ). In the atmosphere of Mars, CO 2 has a non-LTE emission feature at 4.3 μm (L ópez- Valverde et al 2005 ;Giuranna et al 2018 ). In the atmosphere of Venus non-LTE emissions have been detected in limb observations for CO (Gilli et al 2015 ) and CO 2 (Gilli et al 2009 ).…”

Section: Discussionmentioning

confidence: 99%

Non-local thermal equilibrium spectra of atmospheric molecules for exoplanets

Wright¹,

Waldmann²,

Yurchenko³

2022

Preprint

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Here we present a study of non-local thermodynamic equilibrium (LTE) effects on the exoplanetary spectra of a collection of molecules that are key in the investigation of exoplanet atmospheres: water, methane, carbon monoxide, and titanium oxide. These molecules are chosen as examples of different spectral ranges (infrared and ultraviolet), molecular types (diatomics and polyatomics), and spectral types (electronic and rovibrational); the importance of different vibrational bands in forming distinct non-LTE spectral features is investigated. Most notably, such key spectral signatures for distinguishing between the LTE and non-LTE cases include: for CH4&#160;the 3.15&#160;&#x03BC;">&#956;m band region; for H2O the 2.0 and 2.7&#160;&#x03BC;">&#956;m band regions; for TiO, a strong variation in intensity in the bands between 0.5 and 0.75&#160;&#x03BC;">&#956;m; and a sole CO signature between 5 and 6&#160;&#x03BC;">&#956;m. The analysis is based on the ExoMol cross-sections&#160;and takes advantage of the extensive vibrational assignment of these molecular line lists in the ExoMol data base. We examine LTE and non-LTE cross-sections&#160;under conditions consistent with those on WASP-12b and WASP-76b using the empirically motivated bi-temperature Treanor model. An example variation between the LTE case and Non-LTE case with our approach can be seen here for an important Methane band shown at high resolution and low pressure: <img src="" alt="" width="437" height="316" /> &#160; &#160;

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Section: Discussionmentioning

confidence: 99%

Non-local thermal equilibrium spectra of atmospheric molecules for exoplanets

Wright¹,

Waldmann²,

Yurchenko³

2022

Preprint

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Airglow and Aurora in the Martian Atmosphere: Contributions by the Mars Express and ExoMars TGO Missions

González-Galindo,

Gérard,

Soret

et al. 2024

Space Sci Rev

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The study of atmospheric emissions from orbit to probe the middle and upper atmosphere of Mars, which started with the Mariner missions, is living a golden era thanks to the European Space Agency (ESA) Mars Express mission and other subsequent missions built upon its success, including the ESA ExoMars Trace Gas Orbiter (TGO) mission. Here we summarize the most relevant information obtained by the analysis of atmospheric emissions data from Mars Express and TGO, about the temperature and density structure, the atmospheric dynamics, the chemistry and the atmospheric escape to space. Mars Express also opened a new field of research on Mars with the discovery of aurorae on the planet. We present here the most outstanding results collected by Mars Express about aurorae. Finally, we also discuss how later measurements by other missions have complemented Mars Express and TGO results, and the potential future developments relevant to this field of research.

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A discrete integral transform for rapid spectral synthesis

Bekerom

Pannier

2021

Journal of Quantitative Spectroscopy and Radiative Transfer

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PFS/MEX limb observations of 4.3-µm CO2 non-LTE emission in the atmosphere of Mars

Cited by 4 publications

References 34 publications

Non-local thermal equilibrium spectra of atmospheric molecules for exoplanets

Non-local thermal equilibrium spectra of atmospheric molecules for exoplanets

Airglow and Aurora in the Martian Atmosphere: Contributions by the Mars Express and ExoMars TGO Missions

A discrete integral transform for rapid spectral synthesis

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