WASP-7 b

WASP-7 b is an extrasolar planet discovered in 2008. This 5-day period planet, orbiting a round the star WASP-7, is slightly smaller than Jupiter, roughly the same mass and more dense.^[2]

WASP-7 b

Size comparison of WASP-7 b with Jupiter.
Discovery
Discovered by	Cameron et al. (SuperWASP)
Discovery site	SAAO
Discovery date	April 1, 2008
Detection method	Transit
Orbital characteristics
Semi-major axis	0.0618+0.0014 −0.0033 AU
Eccentricity	0.0173+0.0009 −0.0011[1]
Orbital period (sidereal)	4.954658+5.5e-5 −4.3e-5 d
Inclination	89.6+0.4 −0.9
Star	WASP-7
Physical characteristics
Mean radius	0.915+0.046 −0.04 RJ
Mass	0.96+0.12 −0.18 MJ
Mean density	1.66 g/cm3[citation needed]
Surface gravity	3.03 g
Temperature	1393+80 −82 K[1]

A study in 2012, utilizing the Rossiter–McLaughlin effect, determined the planetary orbit is strongly misaligned with the equatorial plane of the star, with misalignment equal to 86±8°, making the planetary orbit nearly polar.^[3] The orbit is also slightly eccentric, which is surprising given the tidal circularization timescale of below 650 million years.^[1]

Physical properties

The measured temperature on the planetary dayside is 1393⁺⁸⁰
₋₈₂ K.^[1] Sodium was detected in the planetary atmosphere in 2022.^[4]

See also

• SuperWASP