Many parameters constraining the spectral appearance of exoplanets are still poorly
understood. We therefore study the properties of irradiated exoplanet atmospheres over a …

Observations of cooler and cooler brown dwarfs show that the contribution from broadening
at many bars pressure is becoming important. The opacity in the red optical to near-IR …

Context. T-type dwarfs present a broad and shallow absorption feature centred around 6950
Å in the blue wing of the K doublet at 0.77 μm which resembles in depth and shape the …

The visible and near-infrared spectra of late L-and T-type dwarf stars are dominated in large
part by the resonance lines of neutral Na and K. It is the collision broadening of these atomic …

Context. Ultracool stellar atmospheres and hot exoplanets show absorption by alkali
resonance lines severely broadened by collisions with neutral perturbers. In the coolest and …

B 2 Σ 1/2+ potential energy curves and associated dipole matrix elements are computed for
M+ Ng at the spin-orbit multi-reference configuration interaction level, where M= K, Rb, Cs …

Spectral line widths of the light alkalies are presented for conditions prevailing in brown
dwarf atmospheres. A unified line shape theory and a set of pseudopotentials are used to …

Context. The optical spectra of L and T-type dwarfs exhibit a continuum dominated by the far
wings of the absorption profiles of the Na 3s–3p and K 4s–4p doublet perturbed by …

A general procedure for systematically evaluating the long-range dispersion interaction
between two heteronuclear atoms in arbitrary states is outlined. The C 6 dispersion …

The Anderson Talman theory of spectral line broadening is used together with potential
energy curves calculated at the spin-orbit multi-reference configuration interaction level to …