![Our visible and NIR spectropolarimetric measurements of the earthshine compared to literature data. A 10-pixel binning was applied to the NIR spectrum. The uncertainty per wavelength is plotted as vertical gray error bars. Wavelengths of strong telluric a Our visible and NIR spectropolarimetric measurements of the earthshine compared to literature data. A 10-pixel binning was applied to the NIR spectrum. The uncertainty per wavelength is plotted as vertical gray error bars. Wavelengths of strong telluric a](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/resultados128_139.jpg?itok=lNmJPirL)
Aims. We aim to extend our current observational understanding of the integrated planet Earth spectropolarimetry from the optical to the near-infrared wavelengths. Major biomarkers like O2 and water vapor are strong flux absorbents in the Earth’s atmosphere, and some linear polarization of the reflected stellar light is expected to occur at these wavelengths. Methods. Simultaneous optical (0.4−0.9 μm) and near-infrared (0.9−2.3 μm) linear spectropolarimetric data of the earthshine were acquired by observing the nightside of the waxing Moon. The data have sufficient spectral resolution (2.51
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