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WASP-4b

Extrasolar planet in the constellation Phoenix From Wikipedia, the free encyclopedia

WASP-4b
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WASP-4b is an exoplanet, specifically a hot Jupiter, approximately 891 light-years away[5] in the constellation of Phoenix.[6]

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Discovery

The planet was the discovered by the Wide Angle Search for Planets team using images taken with the SuperWASP-South project's eight wide-angle cameras located at the South African Astronomical Observatory.[7][8][1] Analysis of over 4000 images taken between May and November 2006 resulted in the detection of a transit occurring every 1.3 days. Follow-up radial velocity observations using the Swiss 1.2-metre Leonhard Euler Telescope confirmed that the transiting object was a planet.[1]

Thumb
The radial velocity trend of WASP-4, caused by the presence of WASP-4 b.
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Characteristics

The planetary equilibrium temperature would be 1650±30 K,[9] but the measured dayside temperature is higher, with a 2015 study finding 1900±100 K[10] and a 2020 study finding 1957±68 K.[4]

A study in 2012, utilizing the Rossiter–McLaughlin effect, determined the planetary orbit is probably aligned with the equatorial plane of the star, with misalignment equal to -1+14
12
°.[11]

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]

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References

Further reading

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