FastChem 4 adds a multidimensional Newton solver, logarithmic element densities, adaptive regularization for condensates, and an expanded database of 800 gas species and 511 condensates across 44 elements, yielding improved convergence and new condensation sequences for solar and carbon-rich cases.
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astro-ph.EP 2years
2026 2representative citing papers
New ESPRESSO transmission spectroscopy of GJ 436 b shows no detectable atmospheric features from H I, Na I, Fe I or other species, producing upper limits consistent with a featureless optical spectrum.
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FastChem 4: New chemical elements and improved convergence behaviour
FastChem 4 adds a multidimensional Newton solver, logarithmic element densities, adaptive regularization for condensates, and an expanded database of 800 gas species and 511 condensates across 44 elements, yielding improved convergence and new condensation sequences for solar and carbon-rich cases.
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The atmosphere of the warm Neptune GJ 436 b probed with ESPRESSO
New ESPRESSO transmission spectroscopy of GJ 436 b shows no detectable atmospheric features from H I, Na I, Fe I or other species, producing upper limits consistent with a featureless optical spectrum.