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#biosignature

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Mikko Tuomi<p>The upcoming extremely large telescopes will provide the first opportunity to search for signs of <a href="https://scicomm.xyz/tags/habitability" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>habitability</span></a> and <a href="https://scicomm.xyz/tags/life" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>life</span></a> on non-transiting <a href="https://scicomm.xyz/tags/terrestrial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>terrestrial</span></a> <a href="https://scicomm.xyz/tags/exoplanets" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>exoplanets</span></a>.</p><p>For the most accessible nearby target, <a href="https://scicomm.xyz/tags/Proxima" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Proxima</span></a> Centauri b, we may be able to rule out a sub-Neptune <a href="https://scicomm.xyz/tags/atmosphere" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>atmosphere</span></a> in as little as a single hour of observing, and some <a href="https://scicomm.xyz/tags/biosignature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>biosignature</span></a> disequilibrium pairs may be accessible in 10&nbsp;hours.</p><p><a href="https://scicomm.xyz/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://scicomm.xyz/tags/astrobiology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrobiology</span></a><br><a href="https://arxiv.org/abs/2503.08592" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arxiv.org/abs/2503.08592</span><span class="invisible"></span></a></p>
Mikko Tuomi<p>Chemical disequilibrium quantified using the available free energy has previously been proposed as a potential <a href="https://scicomm.xyz/tags/biosignature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>biosignature</span></a>.</p><p>Atmospheric retrieval coupled with thermodynamical modelling can help assess the detectability of chemical disequilibrium signatures of Earth-like <a href="https://scicomm.xyz/tags/exoplanets" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>exoplanets</span></a>.</p><p>Such approaches could yield the first biosignature detections in <a href="https://scicomm.xyz/tags/exoplanet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>exoplanet</span></a> atmospheres.</p><p><a href="https://scicomm.xyz/tags/astrobiology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrobiology</span></a> <a href="https://scicomm.xyz/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a><br><a href="https://www.nature.com/articles/s41550-023-02145-z" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">nature.com/articles/s41550-023</span><span class="invisible">-02145-z</span></a></p>
Mikko Tuomi<p>We are inching closer and closer to reliably detecting <a href="https://scicomm.xyz/tags/biosignatures" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>biosignatures</span></a> on distant <a href="https://scicomm.xyz/tags/planets" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>planets</span></a>.</p><p>Much of the focus is on determining which chemicals indicate <a href="https://scicomm.xyz/tags/life" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>life</span></a>'s presence.</p><p>But life can also create free energy in a system, and excess energy can create chemical disequilibrium. That's what happened on Earth when life got going.</p><p>Could chemical disequilibrium be a <a href="https://scicomm.xyz/tags/biosignature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>biosignature</span></a>?</p><p><a href="https://scicomm.xyz/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://scicomm.xyz/tags/astrobiology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrobiology</span></a> <a href="https://scicomm.xyz/tags/exoplanets" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>exoplanets</span></a><br><a href="https://phys.org/news/2023-11-life-easiest-planets-earlier-earth.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">phys.org/news/2023-11-life-eas</span><span class="invisible">iest-planets-earlier-earth.html</span></a></p><p>Paper by Young et al. (2023):<br><a href="https://arxiv.org/abs/2311.06083" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arxiv.org/abs/2311.06083</span><span class="invisible"></span></a></p>
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