Cooling Process of White Dwarf Stars in Palatini f(R) Gravity [PDF]
Universe, 2022 A simple cooling model of white dwarf stars is re-analyzed in Palatini f(R) gravity. Modified gravity affects the white dwarf structures and consequently their ages.
Surajit Kalita +2 more
doaj +2 more sources
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14 [PDF]
Monthly notices of the Royal Astronomical Society, 2019 White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of each population.
Amaral, Larissa A. +8 more
core +4 more sources
On the Spectral Evolution of Hot White Dwarf Stars. II. Time-dependent Simulations of Element Transport in Evolving White Dwarfs with STELUM [PDF]
Astrophysical Journal, 2021 White dwarf stars are subject to various element transport mechanisms that can cause their surface composition to change radically as they cool, a phenomenon known as spectral evolution.
A. Bédard +3 more
semanticscholar +1 more source
On the Spectral Evolution of Hot White Dwarf Stars. I. A Detailed Model Atmosphere Analysis of Hot White Dwarfs from SDSS DR12 [PDF]
Astrophysical Journal, 2020 As they evolve, white dwarfs undergo major changes in surface composition, a phenomenon known as spectral evolution. In particular, some stars enter the cooling sequence with helium atmospheres (type DO) but eventually develop hydrogen atmospheres (type ...
A. Bédard +3 more
semanticscholar +1 more source
Constraints on light dark matter particles using white dwarf stars [PDF]
International Journal of Modern Physics D, 2020 We report constraints on the nucleon-dark matter particle cross-section using the internal luminosity of observed white dwarf stars in the globular cluster Messier 4.
G. Panotopoulos, I. Lopes
semanticscholar +1 more source
A Chondritic Solar Neighborhood
The Planetary Science Journal, 2023 A persistent question in exoplanet demographics is whether exoplanetary systems form from similar compositional building blocks to our own. Polluted white dwarf stars offer a unique way to address this question, as they provide measurements of the bulk ...
Isabella L. Trierweiler +2 more
doaj +1 more source
X-Ray Signatures of Axion Conversion in Magnetic White Dwarf Stars. [PDF]
Physical Review Letters, 2019 White dwarf (WD) stars may radiate keV-energy axions produced in their stellar cores. This has been extensively studied as an extra channel by which WDs may cool, with some analyses even suggesting that axions can help explain the observed WD luminosity ...
Christopher Dessert +2 more
semanticscholar +1 more source
New full evolutionary sequences of H- and He-atmosphere massive white dwarf stars using mesa [PDF]
Monthly notices of the Royal Astronomical Society, 2018 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.
G. R. Lauffer, A. Romero, S. O. Kepler
semanticscholar +1 more source
Catalog of Magnetic White Dwarfs with Hydrogen Dominated Atmospheres
The Astrophysical Journal, 2023 White dwarfs are excellent research laboratories as they reach temperatures, pressures, and magnetic fields that are unattainable on Earth. To better understand how these three physical parameters interact with each other and with other stellar features,
L. L. Amorim +4 more
doaj +1 more source
Relativistic Tidal Disruption and Nuclear Ignition of White Dwarf Stars by Intermediate-mass Black Holes [PDF]
Astrophysical Journal, 2018 We present results from general relativistic calculations of the tidal disruption of white dwarf stars from near encounters with intermediate-mass black holes. We follow the evolution of 0.2 M⊙ and 0.6 M⊙ stars on parabolic trajectories that approach 103–
P. Anninos +7 more
semanticscholar +1 more source