New full evolutionary sequences of H and He atmosphere massive white dwarf stars using MESA

TL;DR

This paper presents new evolutionary sequences for massive white dwarf stars with hydrogen-rich and hydrogen-deficient atmospheres, derived from detailed MESA simulations covering their entire evolution from main sequence to cooling.

Contribution

It provides comprehensive chemical profiles, initial-to-final mass relations, and cooling times for massive white dwarfs with various core compositions, using detailed MESA models.

Findings

Chemical profiles for C/O, O/Ne, and Ne/O/Mg cores across mass range.

Identification of hybrid C/O-O/Ne core white dwarfs.

Updated mass-radius and cooling time relations.

Abstract

We explore the evolution of hydrogen-rich and hydrogen-deficient white dwarf stars with masses between 1.012 and 1.307 Msun, and initial metallicity of Z=0.02. These sequences are the result of main sequence stars with masses between 8.8 and 11.8 Msun. The simulations were performed with MESA, starting at the zero-age main sequence, through thermally pulsing and mass-loss phases, ending at the white dwarfs cooling sequence. We present reliable chemical profiles for the whole mass range considered, covering the different expected central compositions, i.e. C/O, O/Ne and Ne/O/Mg, and its dependence with the stellar mass. In addition, we present detailed chemical profiles of hybrid C/O-O/Ne core white dwarfs, found in the mass range between 1.024 and 1.15 Msun. We present the initial-to-final mass relation, mass-radius relation, and cooling times considering the effects of atmosphere and core composition.