Molecular line opacity of LiCl in the mid-infrared spectra of brown dwarfs

Abstract

We present a complete line list for the X 1Sigma+ electronic ground state of LiCl computed using fully quantum-mechanical techniques. This list includes transition energies and oscillator strengths in the spectral region 0.3-39,640.7 cm-1 for all allowed rovibrational transitions in absorption within the electronic ground state. The calculations were performed using an accurate hybrid potential constructed from a spectral inversion fit of experimental data and from recent multi-reference single- and double-excitation configuration interaction calculations. The line list was incorporated into the stellar atmosphere code PHOENIX to compute spectra for a range of young to old T dwarf models. The possibility of observing a signature of LiCl in absorption near 15.8 microns is addressed and the proposal to use this feature to estimate the total lithium elemental abundance for these cool objects is discussed.

arXiv comment8 pages, 2 figures, 1 table. Accepted for publication in ApJ 613, Sept. 20 2004

References in corpus (8)

• The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
• The Near-Infrared and Optical Spectra of Methane Dwarfs and Brown Dwarfs
• Line Intensities and Molecular Opacities of the FeH $F^4{\Delta }_i-X^4{\Delta }_i$ Transition
• New CrH Opacities for the Study of L and Brown Dwarf Atmospheres
• Spherically symmetric model atmospheres for low mass pre-Main Sequence stars with effective temperatures between 2000 and 6800 K
• The Lithium Depletion Boundary and the Age of the Young Open Cluster IC~2391
• The Molecular Line Opacity of MgH in Cool Stellar Atmospheres
• The Molecular Continuum Opacity of MgH in Cool Stellar Atmospheres

Cited by in corpus (8)

• ExoMol: molecular line lists for exoplanet and other atmospheres
• Spitzer Infrared Spectrograph Observations of M, L, and T Dwarfs
• The Atmospheres of Earth-like Planets after Giant Impact Events
• SDSS J141624.08+134826.7: A Nearby Blue L Dwarf From the Sloan Digital Sky Survey
• Moderate Resolution Spitzer Infrared Spectrograph (IRS) Observations of M, L, and T Dwarfs
• Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs
• Following the Lithium: Tracing Li-bearing Molecules Across Age, Mass, and Gravity in Brown Dwarfs
• The Sonora Brown Dwarf Atmosphere and Evolution Models I. Model Description and Application to Cloudless Atmospheres in Rainout Chemical Equilibrium