(binary star of two white dwarfs with tight orbit)
ZTF J1539+5027 is an binary star consisting of two
white dwarves. Its orbital period is just under
7 minutes and is measurably decreasing due to gravitational waves.
It is an eclipsing binary and a double-lined spectroscopic binary.
The hotter of the two has a temperature on the order
of 50,000 K.
The light curve shows not only the reductions due to
the eclipses, but a brightening of the less bright star when illuminated
by its companion, something like that of a transiting planet.
(star,binary star,white dwarf)
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