ExoCross: a general program for generating spectra from molecular line lists

Abstract

ExoCross is a Fortran code for generating spectra (emission, absorption) and thermodynamic properties (partition function, specific heat etc.) from molecular line lists. Input is taken in several formats, including ExoMol and HITRAN formats. ExoCross is efficiently parallelized showing also a high degree of vectorization. It can work with several line profiles such as Doppler, Lorentzian and Voigt and support several broadening schemes. Voigt profiles are handled by several methods allowing fast and accurate simulations. Two of these methods are new. ExoCross is also capable of working with the recently proposed method of super-lines. It supports calculations of lifetimes, cooling functions, specific heats and other properties. ExoCross can be used to convert between different formats, such as HITRAN, ExoMol and Phoenix. It is capable of simulating non-LTE spectra using a simple two-temperature approach. Different electronic, vibronic or vibrational bands can be simulated separately using an efficient filtering scheme based on the quantum numbers.

References in corpus (20)

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• Random sampling technique for ultra-fast computations of molecular opacities for exoplanet atmospheres
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• The high-temperature rotation-vibration spectrum and rotational clustering of silylene (SiH${}_2$)
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• ExoMol line lists - XXIX. The rotation-vibration spectrum of methyl chloride up to 1200 K
• The rotation-vibration spectrum of methyl fluoride from first principles
• ExoMol photodissociation cross sections I: HCl and HF
• ExoMol line lists -- L: High-resolution line lists of H${}_3^{+}$, H${}_2$D${}^{+}$, D${}_2$H${}^{+}$ and D${}_3^{+}$
• ExoMol molecular line lists -- XLIII: Rovibronic molecular line list the low-lying two states of NaO
• Rovibronic spectroscopy of PN from first principles
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• A spectroscopic thermometer: individual vibrational band spectroscopy with the example of OH in the atmosphere of WASP-33b
• 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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• Non-Local thermal equilibrium spectra of atmospheric molecules for exoplanets
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• Following the Lithium: Tracing Li-bearing Molecules Across Age, Mass, and Gravity in Brown Dwarfs
• JWST reveals widespread CO ice and gas absorption in the Galactic Center cloud G0.253+0.016
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• The impact of spectral line wing cut-off: Recommended standard method with application to MAESTRO opacity database
• Cthulhu: An Open Source Molecular and Atomic Cross Section Computation Code for Substellar Atmospheres
• The nuclear-spin-forbidden rovibrational transitions of water from first principles
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• Modelling the non-local thermodynamic equilibrium spectra of silylene (SiH2)
• An ab initio spectroscopic model of the molecular oxygen atmospheric and infrared bands
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• Global Chemistry and Thermal Structure Models for the Hot Jupiter WASP-43b and Predictions for JWST
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