Planetary formation tracks on the HR diagram show three branches: ascending during solid accretion with L proportional to T to the 8th for in-situ planetesimals, near-horizontal during gas accretion, and descending during post-accretion cooling.
Updated Electron-Conduction Opacities: The Impact on Low-Mass Stellar Models
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abstract
We review the theory of electron-conduction opacity, a fundamental ingredient in the computation of low-mass stellar models; shortcomings and limitations of the existing calculations used in stellar evolution are discussed. We then present new determinations of the electron-conduction opacity in stellar conditions for an arbitrary chemical composition, that improve over previous works and, most importantly, cover the whole parameter space relevant to stellar evolution models (i.e., both the regime of partial and high electron degeneracy). A detailed comparison with the currently used tabulations is also performed. The impact of our new opacities on the evolution of low-mass stars is assessed by computing stellar models along both the H- and He-burning evolutionary phases, as well as Main Sequence models of very low-mass stars and white dwarf cooling tracks.
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Red-giant luminosity observations at the tip of the branch are used to set upper limits on dark-matter masses near 10^11 GeV and spin-independent cross sections near 10^{-37} cm² by requiring that DM-induced core heating does not cause premature helium ignition.
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Planetary formation tracks on the Hertzsprung-Russell diagram: Visualising the processes of giant planet growth
Planetary formation tracks on the HR diagram show three branches: ascending during solid accretion with L proportional to T to the 8th for in-situ planetesimals, near-horizontal during gas accretion, and descending during post-accretion cooling.
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Probing Heavy Dark Matter in Red Giants
Red-giant luminosity observations at the tip of the branch are used to set upper limits on dark-matter masses near 10^11 GeV and spin-independent cross sections near 10^{-37} cm² by requiring that DM-induced core heating does not cause premature helium ignition.