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| Paper: |
Astrobiologically Interesting Stars Within 20 Parsecs of the Sun |
| Monograph: |
11, HWO25 Proceedings Part II: Mission Framework, Technology, and Broader Contributions |
| Page: |
93 |
| Authors: |
Tarek Haimuri and Gustavo F. Porto de Mello |
| DOI: |
10.26624/ZQDE6466 |
| Abstract: |
This project identifies and characterizes a complete sample of stars of astrobiological interest within 20 parsecs of the Sun, using data from the Hipparcos and Gaia catalogs. The main goal is the characterization of optimized targets for future orbital interferometric probes aimed at detecting biosignatures on exoplanets in the habitable zones of these stars, through the infrared spectroscopic signature of ozone, water, and methane. The selection criteria depend on multiple factors, primarily the mass, age, and chemical composition of each star, which govern the evolution rate of stellar luminosity and, consequently, the lifespan of planets within the habitable zone. Data from the literature on the stars' effective temperatures and metallicities are compiled, and their masses and luminosities are estimated based on stellar evolutionary tracks. The ages of the stars will be determined using isochronal, chromospheric, and kinematic methods. Each star's age is individually assessed in terms of the longevity of its habitable zone. A model is also developed to estimate the minimum mass a K-type star must have to prevent tidal locking from compromising the habitability of planets in its habitable zone. The result is a comprehensive catalog of F, G, and K type stars of astrobiological interest located within 20 parsecs of the Sun, all of which exhibit lifespans compatible with the emergence of photosynthetic biosignatures on potential planets within their habitable zones. |
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