An accurate, extensive, and practical line list of methane for the HITEMP database

Abstract

A methane line list for the HITEMP spectroscopic database, covering 0-13,400 cm${}^{-1}$ ($>$746 nm), is presented. To create this compilation, ab initio line lists of ${}^{12}$CH${}_4$ from Rey et al. (2017) ApJ, 847, 105 (provided at separate temperatures in the TheoReTS information system), are now combined with HITRAN2016 methane data to produce a single line list suitable for high-temperature line-by-line calculations up to 2000 K. An effective-temperature interpolation model was created in order to represent continuum-like features at any temperature of interest. This model is advantageous to previously-used approaches that employ so-called ``super-lines'', which are suitable only at a given temperature and require separate line lists for different temperatures. The resultant HITEMP line list contains $\sim$32 million lines and is significantly more flexible than alternative line lists of methane, while accuracy required for astrophysical or combustion applications is retained. Comparisons against experimental observations of methane absorption at high temperatures have been used to demonstrate the accuracy of the new work. The line list includes both strong lines and quasi-continuum features and is provided in the common user-friendly HITRAN/HITEMP format, making it the most practical methane line list for radiative transfer modeling at high-temperature conditions.

25 pages, 12 figures, submitted to the Astrophysical Journal Supplement Series

References in corpus (40)

• The orbital motion, absolute mass, and high-altitude winds of exoplanet HD209458b
• A high accuracy computed water line list
• Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager
• The ExoMol database: molecular line lists for exoplanet and other hot atmospheres
• Chemical Equilibrium Abundances in Brown Dwarf and Extrasolar Giant Planet Atmospheres
• ExoMol line lists IV: The rotation-vibration spectrum of methane up to 1500 K
• The fast spin-rotation of a young extrasolar planet
• The Discovery of Y Dwarfs Using Data from the Wide-field Infrared Survey Explorer (WISE)
• Detection of Carbon Monoxide and Water Absorption Lines in an Exoplanet Atmosphere
• Characterizing transiting exoplanet atmospheres with JWST
• The 0.8-14.5 micron Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity
• Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function
• A population study of gaseous exoplanets
• Planetary Spectrum Generator: an accurate online radiative transfer suite for atmospheres, comets, small bodies and exoplanets
• Strong Water Absorption in the Dayside Emission Spectrum of the Planet HD 189733b
• Water, Methane, and Carbon Dioxide Present in the Dayside Spectrum of the Exoplanet HD 209458b
• Retrieving Temperatures and Abundances of Exoplanet Atmospheres with High-Resolution Cross-Correlation Spectroscopy
• Atomic iron and titanium in the atmosphere of the exoplanet KELT-9b
• HELIOS-K: An Ultrafast, Open-source Opacity Calculator for Radiative Transfer
• ExoCross: a general program for generating spectra from molecular line lists
• Simultaneous Detection of Water, Methane and Carbon Monoxide in the Atmosphere of Exoplanet HR8799b
• A hybrid line list for CH${}_4$ and hot methane continuum
• High-Resolution Spectroscopic Detection of TiO and Stratosphere in the Day-side of WASP-33b
• Discovery of water at high spectral resolution in the atmosphere of 51 Peg b
• Probing the terminator region atmosphere of the Hot-Jupiter XO-1b with transmission spectroscopy
• A search for TiO in the optical high-resolution transmission spectrum of HD 209458b: Hindrance due to inaccuracies in the line database
• A room temperature CO${}_2$ line list with ab initio computed intensities
• Structure and Composition of Pluto's atmosphere from the New Horizons Solar Ultraviolet Occultation
• Spectroscopic line parameters of NO, NO${}_2$, and N${}_2$O for the HITEMP database
• Exoplanet atmospheres with GIANO II. Detection of molecular absorption in the dayside spectrum of HD 102195b
• The Onset of Methane in L Dwarfs
• Empirical line lists and absorption cross sections for methane at high temperature
• Laboratory spectra of hot molecules: data needs for hot super-Earth exoplanets
• Methane and Ammonia in the near-infrared spectra of late T dwarfs
• The Dawes Review 3: The Atmospheres of Extrasolar Planets and Brown Dwarfs
• Introduction of water-vapor broadening coefficients and their temperature dependence exponents into the HITRAN database, Part I: CO2, N2O, CO, CH4, O2, NH3, and H2S
• Ultrafast-laser-absorption spectroscopy for single-shot, mid-infrared measurements of temperature, CO, and CH${}_4$ in flames
• New Y and T dwarfs from WISE identified by Methane Imaging
• Doppler tomography as a tool for detecting exoplanet atmospheres
• H2-Induced Pressure Broadening and Pressure Shift in the P-Branch of the v3 Band of CH4 from 300 to 700 K

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• Atmospheric abundances and bulk properties of the binary brown dwarf Gliese 229 Bab from JWST/MIRI spectroscopy
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• Tighter constraints on the atmosphere of GJ 436 b from combined high-resolution CARMENES and CRIRES${}^{+}$ observations
• Osiris revisited: Confirming a solar metallicity and low C/O in HD 209458b
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