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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693883.0, MPI für Astronomie / Publikationen_mpia
Transmission spectrum of Earth as a transiting exoplanet from the ultraviolet to the near-infrared
Authors:Bétrémieux, Y.; Kaltenegger, L.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:The Astrophysical Journal Letters
Issue / Number:2
Start Page:id. L31 (6 pp)
Audience:Not Specified
Abstract / Description:Transmission spectroscopy of exoplanets is a tool to characterize rocky planets and explore their habitability. Using the Earth itself as a proxy, we model the atmospheric cross section as a function of wavelength, and show the effect of each atmospheric species, Rayleigh scattering, and refraction from 115 to 1000 nm. Clouds do not significantly affect this picture because refraction prevents the lowest 12.75 km of the atmosphere, in a transiting geometry for an Earth-Sun analog, to be sampled by a distant observer. We calculate the effective planetary radius for the primary eclipse spectrum of an Earth-like exoplanet around a Sun-like star. Below 200 nm, ultraviolet (UV) O2 absorption increases the effective planetary radius by about 180 km, versus 27 km at 760.3 nm, and 14 km in the near-infrared (NIR) due predominantly to refraction. This translates into a 2.6% change in effective planetary radius over the UV-NIR wavelength range, showing that the UV is an interesting wavelength range for future space missions.
Free Keywords:astrobiology; Earth; line: identification; planets and satellites: atmospheres; radiative transfer; ultraviolet: planetary systems
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/2041-8205/772/2/L31
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