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    White dwarf - Wikipedia

    • A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: ... or inward migration after the white dwarf has formed. The former case is implausible for low-mass bodies, as they are unlikely to survive being absorbed by their stars. In the latter case, the planets would have to expel so ...… See more

    Overview

    A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: … See more

    Discovery

    The first white dwarf discovered was in the triple star system of 40 Eridani, which contains the relatively bright main sequence star 40 Eridani A, orbited at a distance by the closer binary system of the white dwarf 40 Eridani B and … See more

    Composition and structure

    Although white dwarfs are known with estimated masses as low as 0.17 M☉ and as high as 1.33 M☉, the mass distribution is strongly peaked at 0.6 M☉, and the majority lie between 0.5 and 0.7 M☉. The estimated r… See more

    Variability

    Early calculations suggested that there might be white dwarfs whose luminosity varied with a period of around 10 seconds, but searches in the 1960s failed to observe this. The first variable white dwarf found was … See more

    Formation

    White dwarfs are thought to represent the end point of stellar evolution for main-sequence stars with masses from about 0.07 to 10 M☉. The composition of the white dwarf produced will depend on the initial mas… See more

    Fate

    A white dwarf is stable once formed and will continue to cool almost indefinitely, eventually to become a black dwarf. Assuming that the universe continues to expand, it is thought that in 10 to 10 years, the … See more

    Debris disks and planets

    A white dwarf's stellar and planetary system is inherited from its progenitor star and may interact with the white dwarf in various ways. There are several indications that a white dwarf has a remnant planetary system. … See more

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    Table of Contents
    Overview
    Discovery
    Composition and structure
    Variability
    Formation
    Fate
    Debris disks and planets
     
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