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Biosignatures of th...
Biosignatures of the Earth : I. Airborne spectropolarimetric detection of photosynthetic life
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- Patty, C. H.Lucas (författare)
- University of Bern
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- Kühn, Jonas G. (författare)
- University of Geneva,University of Bern
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- Lambrev, Petar H. (författare)
- Hungarian Academy of Sciences
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- Spadaccia, Stefano (författare)
- University of Bern
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- Jens Hoeijmakers, H. (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Keller, Christoph (författare)
- Leiden University
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- Mulder, Willeke (författare)
- Leiden University
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Pallichadath, Vidhya (författare)
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- Poch, Olivier (författare)
- University Grenoble Alpes
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- Snik, Frans (författare)
- Leiden University
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- Stam, Daphne M. (författare)
- Delft University of Technology
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- Pommerol, Antoine (författare)
- University of Bern
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- Demory, Brice Olivier (författare)
- University of Bern
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(creator_code:org_t)
- 2021-07-14
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 651
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http://dx.doi.org/10... (free)
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http://arxiv.org/pdf...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. Homochirality is a generic and unique property of life on Earth and is considered a universal and agnostic biosignature. Homochirality induces fractional circular polarization in the incident light that it reflects. Because this circularly polarized light can be sensed remotely, it can be one of the most compelling candidate biosignatures in life detection missions. While there are also other sources of circular polarization, these result in spectrally flat signals with lower magnitude. Additionally, circular polarization can be a valuable tool in Earth remote sensing because the circular polarization signal directly relates to vegetation physiology. Aims. While high-quality circular polarization measurements can be obtained in the laboratory and under semi-static conditions in the field, there has been a significant gap to more realistic remote sensing conditions. Methods. In this study, we present sensitive circular spectropolarimetric measurements of various landscape elements taken from a fast-moving helicopter. Results. We demonstrate that during flight, within mere seconds of measurements, we can differentiate (S∕ N > 5) between grass fields, forests, and abiotic urban areas. Importantly, we show that with only nonzero circular polarization as a discriminant, photosynthetic organisms can even be measured in lakes. Conclusions. Circular spectropolarimetry can be a powerful technique to detect life beyond Earth, and we emphasize the potential of utilizing circular spectropolarimetry as a remote sensing tool to characterize and monitor in detail the vegetation physiology and terrain features of Earth itself.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Astrobiology
- Earth
- Planets and satellites: surfaces
- Planets and satellites: terrestrial planets
- Polarization
- Techniques: polarimetric
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Patty, C. H.Luca ...
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Kühn, Jonas G.
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Lambrev, Petar H ...
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Spadaccia, Stefa ...
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Jens Hoeijmakers ...
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Keller, Christop ...
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visa fler...
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Mulder, Willeke
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Pallichadath, Vi ...
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Poch, Olivier
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Snik, Frans
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Stam, Daphne M.
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Pommerol, Antoin ...
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Demory, Brice Ol ...
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