Feb 20, 2025 · Astronomers have studied 3,600 supernovas to discover diversity in exploding white dwarf stars, a vital tool in the investigation of dark energy.

Feb 14, 2025 · The sheer amount of white dwarf explosions resulting from incidents like star collisions or star “cannibalism” may help to enlighten astrophysicists on dark energy and its …

Feb 26, 2025 · First, as white dwarfs cool down, energy transport by radiation alone becomes insufficient to maintain thermal equilibrium, and a convection layer that transports both energy …

Jan 30, 2025 · The white dwarf sucks matter from its binary star companion. When it becomes heavier than a certain limit, it becomes unstable and explodes. ... If dark energy is not …

Feb 13, 2025 · Using a 3D global climate computer model normally employed to study Earth’s environment, the astronomers found that the white dwarf exoplanet was much warmer than …

Feb 14, 2025 · The dramatic explosions of white dwarf stars at the ends of their lives have for decades played a pivotal role in the study of dark energy – the mysterious force responsible …

Aug 11, 2020 · Thus, it is possible for a burnt-out star to maintain itself against complete collapse under gravity via the degeneracy pressure of its constituent electrons. Such stars are termed …

Mar 12, 2020 · It seems then that one could continue to use a White Dwarf as a source of energy in the early stages of a White Dwarf’s life, but as the White Dwarf ages its ability to serve as an …

1 day ago · The universe is full of celestial wonders, but some mysteries linger for decades before they are unraveled. One such mystery has finally been explained—the puzzling X-ray …

As captured matter falls onto the surface of the white dwarf, it accelerates and gains energy. This energy goes into heating gas on or just above the surface of the white dwarf to temperatures …

Sep 23, 2021 · A white dwarf is what stars like the Sun become after they have exhausted their nuclear fuel. Near the end of its nuclear burning stage, this type of star expels most of its outer …

Stars low and intermediate mass, up to about 8 solar masses, end their life as a white dwarf - the collapsed dead core of a red giant that has shed its out layers in a planetary nebula. The core …

5 days ago · As compact relativistic objects, white dwarfs are in different classes than neutron stars. Because white dwarfs are comparatively less compact than neutron stars are, the …

Mar 4, 2022 · White dwarfs are what is left when stars like our sun have exhausted all of their fuel. They are dense, dim, stellar corpses — the last observable stage of evolution for low- and …

The total energy of a white-dwarf star can be written (516) where is the kinetic energy of the degenerate electrons (the kinetic energy of the ion is negligible), and is the gravitational …

For stellar masses less than about 1.44 solar masses, the energy from the gravitational collapse is not sufficient to produce the neutrons of a neutron star, so the collapse is halted by electron …

Jun 12, 2020 · White dwarf stars no longer produce energy to counteract their mass. Theoretically, white dwarfs cannot exceed 1.4 solar masses, some examples of white dwarf stars are Sirius …

White dwarfs are stars supported by pressure of degenerate electron gas, i.e. in their interiors thermal energy kT is much smaller then Fermi energy EF .

Let us investigate the physics of white-dwarfs in more detail. The total energy of a white-dwarf star can be written. where is the total kinetic energy of the degenerate electrons (the kinetic energy …

Oct 20, 2017 · The authors studied four white dwarfs – one magnetic, and three non-magnetic. They chose a magnetic white dwarf with a very weak field, of only tens of kG, so that the lines …

The energy of the white dwarf can be approximated by taking it to be the sum of its gravitational potential energy and kinetic energy. The gravitational potential energy of a unit mass piece of …

Mar 22, 2024 · White dwarfs no longer support nuclear fusion reactions that generate energy, but they are still extremely hot. A typical white dwarf is half as massive as the Sun, yet only slightly …

astronomers to observe X-rays from a white dwarf. These opportunities occur when a white dwarf is capturing matter from a nearby companion star. As captured matter falls onto the surface of …