Detectability of Red-Edge Shifted Vegetation on M-star Terrestrial Planets

Details Detectability of Red-Edge Shifted Vegetation on M-star Terrestrial Planets Detectability of Red-Edge Shifted Vegetation on M-star Terrestrial Planets

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa53b1177t&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA53B-1177

Physics

3360 Remote Sensing, 5210 Planetary Atmospheres, Clouds, And Hazes (0343)

Scientific paper

We have explored the detectability of exo-vegetation on the surface of a terrestrial planet orbiting a M-star. The exo-vegetation is responsible for producing a red-edge like signature that is red-shifted with respect to the Earth vegetation red-edge. The red-shift was estimated using a model of leaf optical properties spectra (Jacquemoud, 1990) combined with a three photon photosynthetic scheme calculated by Wolstencroft and Raven (2002) for possible exo-vegetation growing on a M-star planet. To study the detectability of this surface biosignature on a M-star terrestrial planet, we have used the 3-D model developed by Tinetti et al. (2005) for the case of the Earth. This model can generate disk-averaged spectra and broad-band integrated fluxes, useful to future terrestrial planet exploration missions, such as NASA Terrestrial Planet Finder-Coronograph. Input to this model, were the atmospheric profiles and cloud distributions predicted by Joshi (2003) for a synchronous planet orbiting a M-star and the distinctive surface reflectance of the exo-vegetation. Finally, we discuss here the sensitivity of Earth tuned indicator of vegetation, such as Normalized Difference Vegetation Index (NDVI), to these new exotic scenarios.

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