Update of the HITRAN collision-induced absorption section

Karman, Tijs; Gordon, Iouli E.; Avoird, Ad van der; Baranov, Yu. I.; Boulet, C.; Drouin, Brian J.; Groenenboom, Gerrit C.; Gustafsson, Magnus; Hartmann, Jean‐Michel; Kurucz, Robert L.; Rothman, Laurence S.; Sun, Kang; Sung, Keeyoon; Thalman, Ryan; Tran, H.; Wishnow, Edward H.; Wordsworth, R.; Vigasin, A. A.; Volkamer, Rainer; Zande, Wim J. van der

doi:10.1016/j.icarus.2019.02.034

Cited by 154 publications

(115 citation statements)

References 97 publications

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“…Collision-induced absorption of H 2 -H 2 and H 2 -He pairs are taken into account by the corresponding data provided within the HITRAN database (Karman et al 2019).…”

Section: Opacities and Spectral Resolutionmentioning

confidence: 99%

Helios-r2: A New Bayesian, Open-source Retrieval Model for Brown Dwarfs and Exoplanet Atmospheres

Kitzmann

Heng

Oreshenko

et al. 2020

ApJ

123

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We present an improved, hybrid CPU-GPU atmospheric retrieval code, Helios-r.2, which is applicable to medium-resolution emission spectra of brown dwarfs, in preparation for precision atmospheric spectroscopy in the era of the James Webb Space Telescope. The model is available as open source code on the Exoclimes Simulation Platform. We subject Helios-r.2 to a battery of tests of varying difficulty. The simplest test involves a mock retrieval on a forward model generated using the same radiative transfer technique, the same implementation of opacities, and the same chemistry model. The least trivial test involves a mock retrieval on synthetic spectra from the Sonora model grid, which uses a different radiative transfer technique, a different implementation of opacities, and a different chemistry model. A calibration factor, which is included to capture uncertainties in the brown dwarf radius, distance to the brown dwarf and flux calibration of the spectrum, may compensate, sometimes erroneously, for discrepancies in modeling choices and implementation. We analyze spectra of the benchmark brown dwarf GJ 570 D and the binary brown dwarf companions in the Epsilon Indi system. The retrieved surface gravities are consistent with previous studies and/or values inferred from dynamical masses (for Epsilon Indi Ba and Bb only). There remains no clear criterion on how to reject unphysical values of the retrieved brown dwarf radii. The retrieved carbon-to-oxygen ratios and metallicity depend on whether chemical equilibrium is assumed.

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“…Collision-induced absorption of H 2 -H 2 and H 2 -He pairs are taken into account by the corresponding data provided within the HITRAN database (Karman et al 2019).…”

Section: Opacities and Spectral Resolutionmentioning

confidence: 99%

Helios-r2: A New Bayesian, Open-source Retrieval Model for Brown Dwarfs and Exoplanet Atmospheres

Kitzmann

Heng

Oreshenko

et al. 2020

ApJ

123

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“…4.4). Although the tables in these sections may not be exhaustive, they give numerous starting points for bibliographical searches, while data and other references are also given in [1,244,[429][430][431][432][433]. Finally, the recent evolution of spectroscopic databases is discussed in Sec.…”

Section: Available Datamentioning

confidence: 99%

“…Several relatively recent references, in which CIA data obtained from measurements and/or calculations are presented, are regrouped in Table 8. In addition to those given below, other older studies can be found by consulting [389,432,433]…”

Section: Collision-induced Absorptionmentioning

confidence: 99%

“…Note that HAPI also enables calculations of the absorption cross-sections for mixtures of perturbing gases. Finally recall that, in 2012, a new section providing CIA data was added to the HITRAN database [432], now being updated [433].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Nevertheless, CIA plays a stronger role on Titan than on the Earth, with contributions from N 2 -N 2 , N 2 -CH 4 , N 2 -H 2 and CH 4 -CH 4. Nowadays the relevant data can be obtained from HITRAN [432,433], which are notably based on the relatively old studies of [696][697][698]. Radiative heating occurs through the absorption of visible and near-infrared light by methane and aerosols.…”

Section: Modeling Atmospheres Observed In the Solar Systemmentioning

confidence: 99%

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A retrieval challenge exercise for the Ariel mission

et al. 2022

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The Ariel mission, due to launch in 2029, will obtain spectroscopic information for 1000 exoplanets, providing an unprecedented opportunity for comparative exoplanetology. Retrieval codes - parameteric atmospheric models coupled with an inversion algorithm - represent the tool of choice for interpreting Ariel data. Ensuring that reliable and consistent results can be produced by these tools is a critical preparatory step for the mission. Here, we present the results of a retrieval challenge. We use five different exoplanet retrieval codes to analyse the same synthetic datasets, and test a) the ability of each to recover the correct input solution and b) the consistency of the results. We find that generally there is very good agreement between the five codes, and in the majority of cases the correct solutions are recovered. This demonstrates the reproducibility of retrievals for transit spectra of exoplanets, even when codes are not previously benchmarked against each other.

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Update of the HITRAN collision-induced absorption section

Cited by 154 publications

References 97 publications

Helios-r2: A New Bayesian, Open-source Retrieval Model for Brown Dwarfs and Exoplanet Atmospheres

Helios-r2: A New Bayesian, Open-source Retrieval Model for Brown Dwarfs and Exoplanet Atmospheres

Recent advances in collisional effects on spectra of molecular gases and their practical consequences

A retrieval challenge exercise for the Ariel mission

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