Mid-Infrared Properties of Disk Averaged Observations of Earth with AIRS

Details Mid-Infrared Properties of Disk Averaged Observations of Earth with AIRS Mid-Infrared Properties of Disk Averaged Observations of Earth with AIRS

2008-10-16

arxiv.org/abs/0810.2957v1

Astrophys.J.693:1763-1774,2009

Astronomy and Astrophysics

Astrophysics

23 pages, 11 figures

Scientific paper

10.1088/0004-637X/693/2/1763

We have investigated mid-infrared spectra of Earth obtained by the Atmospheric Infrared Sounder (AIRS) instrument on-board the AQUA spacecraft to explore the characteristics that may someday be observed in extrasolar terrestrial planets. We have used the AIRS infrared (R ~ 1200; 3.75-15.4 microns) spectra to construct directly-observed high-resolution spectra of the only known life bearing planet, Earth. The AIRS spectra are the first such spectra that span the seasons. We investigate the rotational and seasonal spectral variations that would arise due to varying cloud amount and viewing geometry and we explore what signatures may be observable in the mid-infrared by the next generation of telescopes capable of observing extrasolar terrestrial planets.

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