Atmospheric haze consists of small suspended particles that scatter or absorb radiation, often formed through atmospheric photochemistry rather than direct condensation of a locally abundant vapour. In an exoplanet atmosphere, transport, growth and settling determine the particles' altitude and size distribution.
A haze can add a wavelength-dependent continuum to an exoplanet transmission spectrum and conceal molecular bands. The scattering slope of a transmission spectrum connects an idealized extinction law with the atmospheric scale height, but a measured slope alone does not establish a particular haze composition. Stellar contamination of a transmission spectrum can also alter the slope. Distinguishing these explanations requires spectral coverage and a joint model of the star and planet.
Haze refers to a type of atmospheric phenomenon characterized by the presence of suspended particles in the air that reduce visibility. These particles can include dust, smoke, water droplets, and other pollutants. Haze can be caused by natural events, such as wildfires or volcanic eruptions, as well as human activities, such as industrial emissions, vehicle exhaust, and agricultural burning. The presence of haze can lead to reduced air quality and pose health risks, particularly for individuals with respiratory conditions.
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