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WASP-11b/HAT-P-10b
	Size comparison of WASP-11b/HAT-P-10b with Jupiter.
Discovery
Discovered by	West et al. (SuperWASP); Bakos et al. (HATNet)
Discovery site	SAAO
Discovery date	April 1, 2008 (announced); September 26, 2008 (preprints)
Detection method	Transit
Orbital characteristics
Semi-major axis	0.0439+0.0006; −0.0009 AU
Eccentricity	0
Orbital period (sidereal)	3.7224690 ± 0.0000067 d
Inclination	88.5 ± 0.6
Semi-amplitude	69.1 ± 3.5
Star	WASP-11/HAT-P-10
Physical characteristics
Mean radius	1.045+0.050; −0.033 RJ
Mass	0.460 ± 0.028 MJ
Mean density	0.498 ± 0.064 g/cm3
Surface gravity	10.5 m/s2 (34 ft/s2)
Temperature	1030+26; −19

WASP-11b/HAT-P-10b or WASP-11Ab/HAT-P-10Ab^[3] is an extrasolar planet discovered in 2008. The discovery was announced (under the designation WASP-11b) by press release by the SuperWASP project in April 2008 along with planets WASP-6b through to WASP-15b, however at this stage more data was needed to confirm the parameters of the planets and the coordinates were not given.^[4] On 26 September 2008, the HATNet Project's paper describing the planet which they designated HAT-P-10b appeared on the arXiv preprint server.^[1] The SuperWASP team's paper appeared as a preprint on the Extrasolar Planets Encyclopaedia on the same day, confirming that the two objects (WASP-11b and HAT-P-10b) were in fact the same, and the teams agreed to use the combined designation.^[2]

The planet had the third lowest insolation of the known transiting planets at the time of the discovery (prior to this, Gliese 436 b and HD 17156 b were known to have lower insolation). The temperature implies it falls into the pL class of hot Jupiters: planets which lack significant quantities of titanium(II) oxide and vanadium(II) oxide in their atmospheres and do not have temperature inversions.^[5] An alternative classification system for hot Jupiters is based on the equilibrium temperature and the planet's Safronov number.^{[note 2]} In this scheme, for a given temperature, class I planets have high Safronov numbers and tend to be in orbit around cooler host stars, while class II planets have lower Safronov numbers.^[6] In the case of WASP-11b/HAT-P-10b, the equilibrium temperature is 1030 K^{[note 1]} and the Safronov number is 0.047±0.003, which means it is located close to the dividing line between the class I and class II planets.^[1]

The planet is in a binary star system, the second star is WASP-11 B, with a mass 0.34 ± 0.05 of the Sun and a temperature of 3483 ± 43 K.^[7]

Notes

^ ^a ^b Assumes the planet has zero albedo. Its secondary transit of the planet behind its star has not yet been observed and so the temperature provided is a hypothetical "equilibrium temperature".
^ The Safronov number is defined as $\textstyle \Theta ={\frac {1}{2}}\left({\frac {\mathrm {Planetary\ escape\ velocity} }{\mathrm {Orbital\ velocity} }}\right)^{2}$

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Bakos, G. Á.; et al. (2009). "HAT-P-10b: A Light and Moderately Hot Jupiter Transiting A K Dwarf". The Astrophysical Journal. 696 (2): 1950–1955. arXiv:0809.4295. Bibcode:2009ApJ...696.1950B. doi:10.1088/0004-637X/696/2/1950. S2CID 12146075.
^ ^a ^b Schneider, J. "Notes for star WASP-11/HAT-P-10". Extrasolar Planets Encyclopaedia. Archived from the original on 2008-10-01. Retrieved 2008-09-29.
^ West, R. G; Collier Cameron, A; Hebb, L; Joshi, Y. C; Pollacco, D; Simpson, E; Skillen, I; Stempels, H. C; Wheatley, P. J; Wilson, D; Anderson, D; Bentley, S; Bouchy, F; Enoch, B; Gibson, N; Hébrard, G; Hellier, C; Loeillet, B; Mayor, M; Maxted, P; McDonald, I; Moutou, C; Pont, F; Queloz, D; Smith, A. M. S; Smalley, B; Street, R. A; Udry, S (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 [astro-ph.EP].
^ "WASP Planets". SuperWASP. 5 December 2013. Retrieved 2016-01-26.
^ Fortney, J. J.; et al. (2008). "A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters: Two Classes of Irradiated Atmospheres". The Astrophysical Journal. 678 (2): 1419–1435. arXiv:0710.2558. Bibcode:2008ApJ...678.1419F. doi:10.1086/528370. S2CID 17502177.
^ Hansen, B. M. S. & Barman, T. (2007). "Two Classes of Hot Jupiters". The Astrophysical Journal. 671 (1): 861–871. arXiv:0706.3052. Bibcode:2007ApJ...671..861H. doi:10.1086/523038. S2CID 16630784.
^ Open Exoplanet Catalogue WASP-11 20b