Absorption of Infrared Radiant Energy by CO_2 and H_2O IV Shapes of Collision-Broadened CO_2 Lines*

Burch, Darrell E.; Gryvnak, David A.; Patty, Richard R.; Bartky, Charlotte E.

doi:10.1364/josa.59.000267

Cited by 189 publications

(48 citation statements)

References 11 publications

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“…Between 900 and 1800 cm , the absorption by CO is very weak and probably negligible in comparison to absorption by CH 4 , oN 2 0, and HI20 in the same…”

Section: -Imentioning

confidence: 91%

“…Because of the high concentration of lines in the Q-branches, these lines produce a significant portion of the absorption at points further from their centers than do the other local lines. The absorption coefficient at any point can be approximated by including the calculated contribution by the continuum, the three Q-branches near [2][3][4][5][6][7][8][9] 193, 828h and 964 cmQ arnd the local linee centered within 5 cm1 of the %Isrp"%2Ms nF intitwent, The other local lines ,nav be excluded.…”

Section: -8mentioning

confidence: 99%

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Investigation of the Absorption of Infrared Radiation by Atmospheric Gases

Burch¹,

Gryvnak²,

Pembrook³

1970

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“…Between 900 and 1800 cm , the absorption by CO is very weak and probably negligible in comparison to absorption by CH 4 , oN 2 0, and HI20 in the same…”

Section: -Imentioning

confidence: 91%

Section: -8mentioning

confidence: 99%

Investigation of the Absorption of Infrared Radiation by Atmospheric Gases

Burch¹,

Gryvnak²,

Pembrook³

1970

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“…The cutoff is modeled by means of an exponential line wing decrease. For CO 2 , we make use of a fit to the CO 2 measurements by Burch et al (1969), which was obtained from Bruno Bezard (priv. comm.).…”

Section: Appendix A: Updates Of Petitcodementioning

confidence: 99%

Observing transiting planets with JWST

Mollière

Boekel

Bouwman

et al. 2017

A&A

185

250

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Context. The James Webb Space Telescope will enable astronomers to obtain exoplanet spectra of unprecedented precision. The MIRI instrument especially may shed light on the nature of the cloud particles obscuring planetary transmission spectra in the optical and near-infrared. Aims. We provide self-consistent atmospheric models and synthetic JWST observations for prime exoplanet targets in order to identify spectral regions of interest and estimate the number of transits needed to distinguish between model setups. Methods. We select targets that span a wide range of planetary temperatures and surface gravities, ranging from super-Earths to giant planets, that have a high expected signal-to-noise ratio. For all targets, we vary the enrichment, C/O ratio, presence of optical absorbers (TiO/VO), and cloud treatment. We calculate atmospheric structures, emission, and transmission spectra for all targets and use a radiometric model to obtain simulated observations. Further, we analyze JWST's ability to distinguish between various scenarios. Results. We find that in very cloudy planets, such as GJ 1214b, less than ten transits with NIRSpec may be enough to reveal molecular features. Furthermore, the presence of small silicate grains in atmospheres of hot Jupiters may be detectable with a single JWST MIRI transit. For a more detailed characterization of such particles less than ten transits are necessary. Finally, we find that some of the hottest hot Jupiters are well fitted by models which neglect the redistribution of the insolation and harbor inversions, and that 1-4 eclipse measurements with NIRSpec are needed to distinguish between the inversion models.Conclusions. Wet thus demonstrate the capabilities of JWST for solving some of the most intriguing puzzles in current exoplanet atmospheric research. Further, by publishing all models calculated for this study we enable the community to carry out similar studies, as well as retrieval analyses for all planets included in our target list.

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“…The present paper is devoted to the line shape narrowing or the so-called "line mixing effect" non less puzzling phenomenon of line shapes theories than the intriguing problem of extreme wings [1,2]. The narrowing of the absorption line shape for high enough pressures leads to the evident super-Lorentzian absorption near band centers and this effect had been first reported by Bloembergen, Purcell, and Pound [3] more than 50 years ago.…”

Section: Introductionmentioning

confidence: 84%

Line shape narrowing in carbon dioxide at high pressures

Golovko

2002

Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The description of the narrowing effect at high pressures is demonstrated on the example of CO2-He absorption for Q-, P-, and R-branches and for the head of the R-branch. The problem is focused on the physical meaning of this phenomenon that should be associated with the angular and translation momentum transfer to matter from the photon absorbed. The effect is described in the approximation of the single line without the conventional line mixing. A narrowing function is introduced that links the absorption in the resonance region with the one in far wings. This function enlarges the absorption of a single line approximately in two times in the resonance region at high pressures and decreases the one approximately in 20 times in far wings in comparison with the Lorentzian, independently of the type of molecule and pressures. The halfwidth of a single line is assumed to have a nonlinear pressure dependence and approaches to a saturated value at high pressures.

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Absorption of Infrared Radiant Energy by CO_2 and H_2O IV Shapes of Collision-Broadened CO_2 Lines*

Cited by 189 publications

References 11 publications

Investigation of the Absorption of Infrared Radiation by Atmospheric Gases

Investigation of the Absorption of Infrared Radiation by Atmospheric Gases

Observing transiting planets with JWST

Line shape narrowing in carbon dioxide at high pressures

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