ExoMol line lists -- XLV. Rovibronic molecular line lists of calcium monohydride (CaH) and magnesium monohydride (MgH)

Abstract

New molecular line lists for calcium monohydride (${}^{40}$Ca${}^1$H) and magnesium monohydride (${}^{24}$Mg${}^1$H) and its minor isotopologues (${}^{25}$Mg${}^1$H and ${}^{26}$Mg${}^1$H) are presented. The rotation-vibration-electronic (rovibronic) line lists, named \texttt{XAB}, consider transitions involving the \X, \A, and \BBp\ electronic states in the 0--30\,000~cm${}^{-1}$ region (wavelengths $\lambda >0.33$~$\mu$m) and are suitable for temperatures up to 5000 K. A comprehensive analysis of the published spectroscopic literature on CaH and MgH is used to obtain new extensive datasets of accurate rovibronic energy levels with measurement uncertainties and consistent quantum number labelling. These datasets are used to produce new spectroscopic models for CaH and MgH, composed of newly empirically-refined potential energy curves and couplings in/between the different electronic states (e.g.\ spin-orbit, electronic angular momentum, Born-Oppenheimer breakdown, spin-rotation, $\Lambda$-doubling) and previously published \textit{ab initio} transition dipole moment curves. Along with Einstein $A$ coefficients, state lifetimes and Landé $g$-factors are provided, the latter being particularly useful as CaH and MgH can be used to probe stellar magnetic fields. Computed energy levels have been replaced with the more accurate empirical values (if available) when post-processing the line lists, thus tailoring the line lists to high resolution applications. The \texttt{XAB} line lists are available from the ExoMol database at http://www.exomol.com and the CDS astronomical database.

References in corpus (13)

• The 2020 release of the ExoMol database: molecular line lists for exoplanet and other hot atmospheres
• Detection of titanium oxide in the atmosphere of a hot Jupiter
• HELIOS-K 2.0 Opacity Calculator and Open-source Opacity Database for Exoplanetary Atmospheres
• Self-luminous and irradiated exoplanetary atmospheres explored with HELIOS
• The spectrum of hot methane in astronomical objects using a comprehensive computed line list
• New Avenues for Thermal Inversions in hot Jupiters
• The ExoMol project: Software for computing large molecular line lists
• Molecular Cross Sections for High Resolution Spectroscopy of Super Earths, Warm Neptunes and Hot Jupiters
• Molecules as magnetic probes of starspots
• A high-resolution line list for AlO
• Predicted Landé $g$-factors for open shell diatomic molecules
• Empirical Line Lists in the ExoMol Database
• Self-consistent atmosphere modeling with cloud formation for low-mass stars and exoplanets

Cited by in corpus (5)

• Low-Temperature Gas Opacities with AESOPUS 2.0
• A method for the variational calculation of hyperfine-resolved rovibronic spectra of diatomic molecules
• ExoMol line lists -- L: High-resolution line lists of H${}_3^{+}$, H${}_2$D${}^{+}$, D${}_2$H${}^{+}$ and D${}_3^{+}$
• Data structures for photoabsorption within the ExoMol project
• ExoMol line lists -- XLVII. Rovibronic molecular line list of the calcium monohydroxide radical (CaOH)