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Thread: white dwarf binary with 7 minutes long period

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    Default white dwarf binary with 7 minutes long period



    Researchers at Caltech studied a binary consisting of 2 white dwarfs with an incredibly fast, 7 minutes long period.
    They got some very interesting and fascinating results. (3rd link)

    Space.com: https://www.space.com/dead-stars-whi...ing-orbit.html
    Caltech: https://authors.library.caltech.edu/95495/
    Nature: https://www.nature.com/articles/s41586-019-1403-0

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    Default Re: white dwarf binary with 7 minutes long period

    Also I posted a physical.org article on another board.

    https://theskysearchers.com/viewtopic.php?f=74&t=1957

    There wasn't much discussion. But the direct link runs thus:
    https://phys.org/news/2019-07-fastes...7_0jzfjBp7krDk
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    Default Re: white dwarf binary with 7 minutes long period

    Quote Originally Posted by not_Fritz_Argelander View Post
    There wasn't much discussion.
    Don't see a whole lot discussion here either...

    Systems like these should be much more common than neutron star or neutron star plus black hole binaries, but I guess these are much harder to detect, unless they are relatively near. Their combined mass is less than the Sun's, so they are fairly light, but in spite of that, they are still emitting gravitational waves. However, because of their composition, this system is significantly different from the other, denser sources of gravitational waves since there are a lot more unknowns about the possible evolutionary paths it may take. If they were neutron stars or black holes, an eventual merge, and possibly a highly spectacular one would be all but guaranteed, but here mass transfer can stop the inward spiral, even though the bigger dwarf can still blow up in a different way at some later time.

    BTW, I just noticed that the full paper is no longer accessible by the nature link I've posted.
    At the time of my posting, the complete article was readable there...

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    Default Re: white dwarf binary with 7 minutes long period

    The reason for these systems being much more difficult to detect is purely due to the different frequency response of different detector design.

    The wd binaries emit at lower frequencies than LIGO can handle. See the graph

    https://en.m.wikipedia.org/wiki/File...ve_sources.png

    from the article

    https://en.m.wikipedia.org/wiki/Grav...wave_astronomy

    In general, I'm abandoning this board in favor of the other, more properly maintained locale.
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