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WASP-7b

Size comparison of WASP-7b 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 −0.0033 AU
Eccentricity	0.0173 −0.0011
Orbital period (sidereal)	4.954658 −4.3e-5 d
Inclination	89.6 −0.9
Star	WASP-7
Physical characteristics
Mean radius	0.915 −0.04 RJ
Mass	0.96 −0.18 MJ
Mean density	1.66 g/cm
Surface gravity	3.03 g
Temperature	1393 −82 K

WASP-7b is an extrasolar planet discovered in 2008. This 5-day period planet is slightly smaller than Jupiter, roughly the same mass and more dense.

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. The orbit is also slightly eccentric, which is surprising given the tidal circularization timescale of below 650 million years.

Physical properties

The measured temperature on the planetary dayside is 1393
₋₈₂ K. Sodium was detected in the planetary atmosphere in 2022.

See also

• SuperWASP

References

1. ^ Wallack, Nicole L.; Knutson, Heather A.; Deming, Drake (2021), "Trends in Spitzer Secondary Eclipses", The Astronomical Journal, 162 (1): 36, arXiv:2103.15833, Bibcode:2021AJ....162...36W, doi:10.3847/1538-3881/abdbb2, S2CID 232417602
2. Hellier; et al. (December 11, 2008). "WASP-7: The brightest transiting-exoplanet system in the Southern hemisphere". The Astrophysical Journal Letters. 690 (1): L89–L91. arXiv:0805.2600. Bibcode:2009ApJ...690L..89H. doi:10.1088/0004-637X/690/1/L89. S2CID 15962609.
3. Albrecht, Simon; Winn, Joshua N.; Johnson, John A.; Howard, Andrew W.; Marcy, Geoffrey W.; Butler, R. Paul; Arriagada, Pamela; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian B.; Hirano, Teruyuki; Bakos, Gaspar; Hartman, Joel D. (2012), "Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments", The Astrophysical Journal, 757 (1): 18, arXiv:1206.6105, Bibcode:2012ApJ...757...18A, doi:10.1088/0004-637X/757/1/18, S2CID 17174530
4. Rahmati, Hossein; Czesla, Stefan; Khalafinejad, Sara; Mollière, Paul (2022), "Transmission spectroscopy of WASP-7 b with UVES", Astronomy & Astrophysics, 668: A24, arXiv:2210.08517, doi:10.1051/0004-6361/202243955, S2CID 252917734

External links

Media related to WASP-7b at Wikimedia Commons

• WASP Planets

v t e Constellation of Microscopium
List of stars in Microscopium Microscopium in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η θ θ ι ν Flamsteed 2 PsA 3 PsA Variable R S T U AT AU AV AX BO DD HR 7817 7893 7909 7933 7971 7987 8046 8100 8104 8108 8200 8202 HD 202628 Other PSR J2124−3358 WASP-7
Exoplanets WASP-7b
Galaxies	NGC 6925 7012 7057 7060 Other ESO 286-19
Category

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• v
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• Exoplanets discovered by WASP
• Exoplanets discovered in 2008
• Giant planets
• Hot Jupiters
• Transiting exoplanets
• Microscopium
• Exoplanet stubs