A likelihood fit to 47 Tucanae white dwarfs favours thicker hydrogen envelopes and standard MESA diffusion, reproducing the observed cooling luminosity function.
Atmospheres from very low-mass stars to extrasolar planets
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abstract
Within the next few years, several instruments aiming at imaging extrasolar planets will see first light. In parallel, low mass planets are being searched around red dwarfs which offer more favorable conditions, both for radial velocity detection and transit studies, than solar-type stars. We review recent advancements in modeling the stellar to substellar transition. The revised solar oxygen abundances and cloud models allow to reproduce the photometric and spectroscopic properties of this transition to a degree never achieved before, but problems remain in the important M-L transition characteristic of the effective temperature range of characterizable exoplanets.
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The Cooling of Old White Dwarfs in 47 Tucanae
A likelihood fit to 47 Tucanae white dwarfs favours thicker hydrogen envelopes and standard MESA diffusion, reproducing the observed cooling luminosity function.