Swap the L14 habitability section figure to Meadows and Barnes (2018)

The coupled-systems section image and hero frame in the Lecture 14 deck now show the Factors Affecting Habitability diagram from Meadows and Barnes (2018) instead of the Lichtenberg et al. (2023) accretion timeline, with the hero caption following the source's colour coding. The synthesis chapter shows and cites the same figure next to the stack of requirements, and references.bib carries the new entry. The flattened publish copy of the deck is rebuilt.

Author: timlichtenberg

book/14_synthesis/figures/meadowsbarnes2018_habitability_factors.avif

@@ -171,6 +171,16 @@ The stack looks roughly like this:
 
 Each level in the stack is necessary. None of them by itself is sufficient. What makes habitability a *systems* property rather than a checklist is that the levels are *coupled*: the star drives the photochemistry, the photochemistry feeds back on the cloud structure, the cloud structure changes the albedo and the temperature, the temperature controls the weathering, the weathering pulls $\mathrm{CO_2}$ out of the atmosphere, the loss of $\mathrm{CO_2}$ depends on the interior outgassing rate, and the outgassing rate depends on the tectonic regime. Break any link and the system can drift into a regime where surface liquid water is no longer thermodynamically possible.
 
+The same stack, organised by the part of the system each factor belongs to, is drawn in {numref}`fig:l14:habitability-factors` from {cite:t}`MeadowsBarnes2018`. The diagram sorts the known habitability factors into stellar, planetary-system, and planetary properties, and colour-codes each by how we can access it: some can be observed directly, some require models to interpret the observations, and some are reachable only through theory. That last distinction matters for the observational programme of the next section, because it tells us which of these couplings a telescope can actually test.
+
+```{figure} figures/meadowsbarnes2018_habitability_factors.avif
+:align: center
+:name: fig:l14:habitability-factors
+:width: 80%
+
+Factors affecting planetary habitability: the currently understood stellar, planetary-system, and planetary properties that may impact whether a planet can sustain surface liquid water. Font colour denotes how each characteristic is accessible: blue for properties that could be observed directly with sufficiently powerful telescopes, green for those that require modelling interpretation, possibly constrained by observations, and orange for properties or processes accessible primarily through theoretical modelling. The larger the number of these factors that can be determined for a habitable zone candidate, the more robust the assessment of its habitability. Reproduced from {cite:t}`MeadowsBarnes2018`.
+```
+
 ### The habitability coupling loop
 
 The atmospheric segment of this coupled system is drawn in {numref}`fig:l14:tidal-couplings`, a schematic from the {cite:t}`Wordsworth2022` review for a tidally locked rocky planet, one whose rotation period equals its orbital period, so that the same hemisphere always faces the star. The schematic shows the atmosphere's response to one-sided irradiation: clouds form and reflect starlight near the substellar point, super-rotating winds transport heat from the dayside to the nightside, and condensable volatiles are cold-trapped at the antistellar point. In the extreme case the atmosphere collapses onto the nightside surface. Each arrow on the schematic corresponds to a process that the course has covered.

book/14_synthesis/synthesis.md

@@ -6345,3 +6345,14 @@ @article{Ballmer2017
     year    = {2017},
     doi     = {10.1038/ngeo2898}
 }
+
+@incollection{MeadowsBarnes2018,
+    author    = {Meadows, Victoria S. and Barnes, Rory K.},
+    title     = {Factors Affecting Exoplanet Habitability},
+    booktitle = {Handbook of Exoplanets},
+    editor    = {Deeg, Hans J. and Belmonte, Juan Antonio},
+    publisher = {Springer International Publishing},
+    pages     = {2771--2794},
+    year      = {2018},
+    doi       = {10.1007/978-3-319-55333-7_57}
+}

book/_static/slides/lecture14.pdf

@@ -161,7 +161,7 @@ \section{Solar System in the Exoplanet Context}
 
 
 % ════════════════════════════════════════════════════════════
-\sectionimage{lichtenberg2023_nccc_timeline}{Network of coupled climate components. Lichtenberg et al.\ (2023)}
+\sectionimage{meadowsbarnes2018_habitability_factors}{Factors affecting planetary habitability. Meadows \& Barnes (2018)}
 \section{Habitability as a Coupled Systems Property}
 % ════════════════════════════════════════════════════════════
 
@@ -178,11 +178,11 @@ \section{Habitability as a Coupled Systems Property}
   \end{itemize}
 \end{frame}
 
-% Hero: True systems-level coupling stack (Lichtenberg+ 2023 NCCC)
+% Hero: Habitability factors network (Meadows & Barnes 2018)
 \begin{frame}[plain]
   \begin{center}
-    \includegraphics[width=0.95\paperwidth, height=0.85\paperheight, keepaspectratio]{lichtenberg2023_nccc_timeline}\\
-    \footnotesize Network of coupled climate components: interior $\leftrightarrow$ atmosphere $\leftrightarrow$ surface $\leftrightarrow$ biosphere over Gyr timescales. Lichtenberg et al.\ (2023).
+    \includegraphics[width=0.95\paperwidth, height=0.78\paperheight, keepaspectratio]{meadowsbarnes2018_habitability_factors}\\
+    \footnotesize Factors affecting habitability: stellar, planetary-system, and planetary properties jointly shape the surface environment. Blue: directly observable with sufficiently powerful telescopes; green: requires model interpretation, possibly constrained by observations; orange: accessible primarily through theoretical modelling. Meadows \& Barnes (2018).
   \end{center}
 \end{frame}