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  2. ZTF J153932.16+502738.8 - Wikipedia

    en.wikipedia.org/wiki/ZTF_J153932.16+502738.8

    ZTF J153932.16+502738.8 is a double binary white dwarf with an orbital period of just 6.91 minutes. Its period has been observed to be decreasing, due to the emission of gravitational waves. It is both an eclipsing binary and a double-lined spectroscopic binary. [1] The hotter white dwarf is 48,900 K, and the other one is significantly cooler ...

  3. Binary star - Wikipedia

    en.wikipedia.org/wiki/Binary_star

    The well-known binary star Sirius, seen here in a Hubble photograph from 2005, with Sirius A in the center, and white dwarf, Sirius B, to the left bottom from it. A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.

  4. WD J0651+2844 - Wikipedia

    en.wikipedia.org/wiki/WD_J0651+2844

    WD J0651+2844 is a white dwarf binary star system composed of two white dwarfs. [2] They are approximately 120,000 km apart and complete an orbit around their barycenter in less than 13 minutes. [1] This produces an eclipse every 6 minutes. This makes it possible to gather enough data to produce extremely accurate predictions of each future ...

  5. White dwarf - Wikipedia

    en.wikipedia.org/wiki/White_dwarf

    White dwarfs with hydrogen-poor atmospheres, such as WD J2147–4035, are less affected by CIA and therefore have a yellow to orange color. [80] [77] The white dwarf cooling sequence seen by ESA's Gaia mission. White dwarf core material is a completely ionized plasma – a mixture of nuclei and electrons – that is

  6. Binary pulsar - Wikipedia

    en.wikipedia.org/wiki/Binary_pulsar

    An intermediate-mass binary pulsar (IMBP) is a pulsar-white dwarf binary system with a relatively long spin period of around 10–200 ms consisting of a white dwarf with a relatively high mass of approximately . [7] The spin periods, magnetic field strengths, and orbital eccentricities of IMBPs are significantly larger than those of low mass binary pulsars (LMBPs). [7]

  7. HM Cancri - Wikipedia

    en.wikipedia.org/wiki/HM_Cancri

    HM Cancri (also known as HM Cnc or RX J0806.3+1527) is a binary star system about 1,600 light-years (490 pc; 1.5 × 10 16 km) away. [2] It comprises two dense white dwarfs orbiting each other once every 5.4 minutes, at an estimated distance of only 80,000 kilometres (50,000 miles) apart (about 1/5 the distance between the Earth and the Moon).

  8. SDSS 1557 - Wikipedia

    en.wikipedia.org/wiki/SDSS_1557

    SDSS 1557 (SDSS J155720.77+091624.6, WD 1554+094) is a binary system composed of a white dwarf and a brown dwarf.The system is surrounded by a circumbinary debris disk.The debris disk was formed when a minor planet was tidally disrupted around the white dwarf in the past.

  9. Type Ia supernova - Wikipedia

    en.wikipedia.org/wiki/Type_Ia_supernova

    Inward spiraling white dwarf pairs are strongly-inferred candidate sources of gravitational waves, although they have not been directly observed. Double degenerate scenarios raise questions about the applicability of Type Ia supernovae as standard candles , since total mass of the two merging white dwarfs varies significantly, meaning ...