(binary star of two white dwarfs with tight orbit)
ZTF J1539+5027 is an binary star consisting of two
white dwarfs. Its orbital period is just under
7 minutes and is measurably decreasing,
most of the decrease attributed to gravitational waves,
and analysis suggests LISA would detect them.
It is an eclipsing binary and a
double-line 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.
- Boötes - constellation.
- 15h39m32.1588023113s- right ascension.
- +50deg27m38.782960414s - declination.
- 8000 ly - distance.
- 415 seconds - orbital period.
- 0.610 and 0.210 - solar masses.
- 0.01562 and 0.03140 - solar radii (the more massive star has the smaller radius, a phenomenon seen in white dwarfs).
(star,binary star,white dwarf)
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