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Thread: Type 1a Standard Candles Refined a Bit.

  1. #1
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    Type 1a Standard Candles Refined a Bit.

    Standard candles enable calculations of the distance scale of the universe, so calibrating them accurately is of prime importance. Type 1a supernovae have been characterized as originating from two different scenarios, leading to arguments over their use as Standard Candles. One type involves a single degenerate progenitor (SD), while the other involves two, ...double degenerate...(DD).
    The authors use an exhaustive survey of 111 spectra of type 1a spectra from a vast array of telescopes, worldwide, to search for spectroscopic evidence of stripped companion emission. They find none.
    They conclude, that while no model yet explains all Sn1a, the evidence disfavors the Roche Lobe Overflow of SD models.

    SEE:https://arxiv.org/abs/1903.05115


    pete

  2. #2
    Join Date
    May 2004
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    Well there is a recurrent nova in M31 with a period of about a year. It must be close to the limit.
    Is it gaining mass?
    SHARKS (crossed out) MONGEESE (sic) WITH FRICKIN' LASER BEAMS ATTACHED TO THEIR HEADS

  3. #3
    Join Date
    Sep 2003
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    Is this not a "Whoa!"? Is this not pouring a lot of water on the SD SNe fires? If there are 10 million interacting WD binaries in our galaxy, [see here (middle of article) ] then do we not have hard evidence for SD SNe? Will we have to put non-glowing candles in the closet and go with two fireflies instead?
    We know time flies, we just can't see its wings.

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