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| Paper: |
Technosignatures |
| Monograph: |
10, HWO25 Proceedings Part I: Community Science Case Development Documents |
| Page: |
317 |
| Authors: |
Ravikumar Kopparapu; Svetlana Berdyugina; Jacob Haqq-Misra; Thomas Beatty; Vincent Kofman; Nick Siegler; Eddie Schwieterman |
| DOI: |
10.26624/NJQY7280 |
| Abstract: |
The Habitable Worlds Observatory (HWO) Technosignature (TS) task group is a team of technosignature
science experts whose task is to identify the most compelling technosignature science cases, the physical
parameters needed to identify technosignatures, and instrumental specifications for detecting such signals.
The TS task group came under the Biosignature Possibilities subgroup, which was part of the Living
Worlds science working group (SWG). This document proposes nitrogen dioxide pollution (300–600 nm
spectroscopy), artificial structures on the planet surface (high contrast imaging), and night side city lights
(emission lines in 500–900 nm spectroscopy) as possible observable signatures of technological civilizations
with HWO. So far, Earth is the only planet that has both planetary-wide biology and technology that we
know of. The HWO spectroscopic observations in the UV-VIS and imaging observations in the VIS may
provide our first detection of extraterrestrial technology. In fact, HWO is the only telescope that can perform
these historic observations in the wavelength coverage from UV to NIR. While several technosignature
spectroscopic signals are available in the mid-IR, several other potent greenhouse gases and abiotic species
dominate mid-IR wavelengths confusing any potential technosignature features. This report details some of
the possible technosignatures that HWO could detect, the technology required to do so, and the conditions
necessary for such observations. |
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