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Orbital decay is a gradual decrease of the distance between two orbiting bodies at their closest approach (the periapsis) over many orbital periods. These orbiting bodies can be a planet and its satellite , a star and any object orbiting it, or components of any binary system .
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The orbital period is decreasing at 2.373 × 10 −11 seconds per second giving a characteristic timescale of 210,000 years. [1] This decay is mostly due to the emission of gravitational waves, however 7% of the decay could be due to tidal losses. [1] The decay is predicted to go for 130,000 years when the orbital period should reach 5 minutes.
The planet's orbital period appears to be decreasing at a rate of 7.33 ± 0.71 milliseconds per year, suggesting that its orbit is decaying, with a decay timescale of 15.77 ± 1.57 million years. The anomalously high rate of orbital decay of WASP-4b is poorly understood as of 2021.
[2] [10] [11] [12] The ratio of observed to predicted rate of orbital decay is calculated to be 0.997 ± 0.002. [12] The total power of the gravitational waves emitted by this system presently is calculated to be 7.35 × 10 24 watts. For comparison, this is 1.9% of the power radiated in light by the Sun.
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The first indirect evidence for the existence of gravitational waves came in 1974 from the observed orbital decay of the Hulse–Taylor binary pulsar, which matched the decay predicted by general relativity as energy is lost to gravitational radiation.