The formation and evolution of young low-mass stars within halos with high concentration of dark matter particles - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




The formation and evolution of young low-mass stars within halos with high concentration of dark matter particles - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The formation and evolution of low-mass stars within dense halos of darkmatter DM leads to evolution scenarios quite different from the classicalstellar evolution. As a result of our detailed numerical work, we describethese new scenarios for a range of DM densities on the host halo, a range ofscattering cross sections of the DM particles considered, and for stellarmasses from 0.7 to 3 M {\odot}. For the first time, we also computed theevolution of young low-mass stars in their Hayashi track in the pre-mainsequence phase and found that, for high DM densities, these stars stop theirgravitational collapse before reaching the main sequence, in agreement withsimilar studies on first stars. Such stars remain indefinitely in anequilibrium state with lower effective temperatures |\Delta T eff| > 10^3 Kfor a star of one solar mass, the annihilation of captured DM particles intheir core being the only source of energy. In the case of lower DM densities,these proto-stars continue their collapse and progress through the mainsequence burning hydrogen at a lower rate. A star of 1 M {\odot} will spend atime greater than the current age of the universe consuming all the hydrogen inits core if it evolves in a halo with DM density ho {\chi}=10^9 GeV cm^-3. Wealso show the strong dependence of the effective temperature and luminosity ofthese stars on the characteristics of the DM particles and how this can be usedas an alternative method for DM research.



Author: Jordi Casanellas, Ilidio Lopes

Source: https://arxiv.org/



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