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arXiv · 2507.22046

The Cooling of Old White Dwarfs in 47 Tucanae

Leesa Fleury·Harvey Richer·Jeremy Heyl
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Abstract

We analyse the cooling of white dwarfs in the globular cluster 47 Tucanae (47 Tuc) using deep observations from the Hubble Space Telescope that resolve the white dwarf cooling sequence to late enough cooling times that the envelope has become convectively coupled to the core. At these late times, the thickness of the outer H envelope is an important consideration in modelling the cooling. Using the stellar evolution software Modules for Experiments in Stellar Astrophysics, we create a suite of white dwarf cooling models for different thicknesses of the H envelope and different white dwarf masses. An unbinned likelihood analysis is performed to compare the cooling models to the observations in order to constrain the values of these key parameters. We find that thicker H envelopes are preferred, with the best-fitting models reproducing the observed cumulative 47 Tuc white dwarf luminosity functions well.

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Leesa Fleury, Harvey Richer, Jeremy Heyl. 2025-07-29. The Cooling of Old White Dwarfs in 47 Tucanae. https://doi.org/10.1093/mnras%2Fstag1024

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