Carbon-oxygen ultra-massive white dwarfs in general relativity
arXiv:2306.05251 · doi:10.1093/mnras/stad1720
Abstract
We employ the La Plata stellar evolution code, LPCODE, to compute the first set of constant rest-mass carbon-oxygen ultra-massive white dwarf evolutionary sequences for masses higher than 1.29 Msun that fully take into account the effects of general relativity on their structural and evolutionary properties. In addition, we employ the LP-PUL pulsation code to compute adiabatic g-mode Newtonian pulsations on our fully relativistic equilibrium white dwarf models. We find that carbon-oxygen white dwarfs more massive than 1.382 Msun become gravitationally unstable with respect to general relativity effects, being this limit higher than the 1.369 Msun we found for oxygen-neon white dwarfs. As the stellar mass approaches the limiting mass value, the stellar radius becomes substantially smaller compared with the Newtonian models. Also, the thermo-mechanical and evolutionary properties of the most massive white dwarfs are strongly affected by general relativity effects. We also provide magnitudes for our cooling sequences in different passbands. Finally, we explore for the first time the pulsational properties of relativistic ultra-massive white dwarfs and find that the period spacings and oscillation kinetic energies are strongly affected in the case of most massive white dwarfs. We conclude that the general relativity effects should be taken into account for an accurate assessment of the structural, evolutionary, and pulsational properties of white dwarfs with masses above 1.30 Msun.
12 pages, 12 figures, accepted for publication in MNRAS. arXiv admin note: text overlap with arXiv:2208.14144
References in corpus (22)
- Pulsating White Dwarf Stars and Precision Asteroseismology
- Super and massive AGB stars - IV. Final fates - Initial to final mass relation
- A highly magnetised and rapidly rotating white dwarf as small as the Moon
- Asteroseismic inferences on GW Vir variable stars in the frame of new PG 1159 evolutionary models
- White dwarf evolutionary sequences for low-metallicity progenitors: The impact of third dredge-up
- Evolutionary Models for the Remnant of the Merger of Two Carbon-Oxygen Core White Dwarfs
- Spectral classification of the 100 pc white dwarf population from Gaia-DR3 and the Virtual Observatory
- An ultra-massive white dwarf with a mixed hydrogen-carbon atmosphere as a likely merger remnant
- The formation of ultra-massive carbon-oxygen core white dwarfs and their evolutionary and pulsational properties
- The Most Massive White Dwarfs in the Solar Neighborhood
- Discovery of a hot ultramassive rapidly rotating DBA White Dwarf
- A Gravitational Redshift Measurement of the White Dwarf Mass-Radius Relation
- Detections and Constraints on White Dwarf Variability from Time-Series GALEX Observations
- A population synthesis fitting of the resolved white dwarf binary population within 100 pc
- Formation of ultra-massive carbon-oxygen white dwarfs from the merger of carbon-oxygen and helium white dwarf pairs
- The evolution of ultra-massive carbon oxygen white dwarfs
- A double white dwarf with a paradoxical origin?
- Formation of millisecond pulsars with long orbital periods by accretion-induced collapse of white-dwarfs
- Structure and evolution of ultra-massive white dwarfs in general relativity
- Cooling Models for the Most Massive White Dwarfs
- Astrometric and photometric verification of faint blue white dwarfs in the Gaia catalogue of nearby stars
- Newtonian pulsations of relativistic ONe-core ultra-massive DA white dwarfs