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Extrasolar planet List of extrasolar planets 300pxSize comparison of WASP-11b/HAT-P-10b with Jupiter. WASP-11b, HAT-P-10b
Database references

WASP-11b/HAT-P-10b or WASP-11Ab/HAT-P-10Ab[4] 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.[5] On 26 September 2008, the HATNet Project's paper describing the planet which they designated HAT-P-10b appeared on the arXiv preprint server.[2] 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.[1]

The planet has the third lowest insolation of the known transiting planets (only Gliese 436 b and HD 17156 b 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.[6] 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.[7] 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.[2]

## NotesEdit

1. 1.0 1.1 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".
2. The Safronov number is defined as $\textstyle \Theta = \frac{1}{2} \left(\frac{\mathrm{Planetary\ escape\ velocity}}{\mathrm{Orbital\ velocity}}\right)^2$

## ReferencesEdit

1. 1.0 1.1 Schneider, J.. Notes for star WASP-11/HAT-P-10. The Extrasolar Planets Encyclopaedia. Retrieved 2008-09-29.
2. 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 (2009). HAT-P-10b: A Light and Moderately Hot Jupiter Transiting A K Dwarf. The Astrophysical Journal 696 (2): 1950–1955.
3. Template:Cite arxiv
4. http://arxiv.org/abs/1109.2497
5. The Planets. SuperWASP. Retrieved 2008-09-26.
6. 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.
7. Hansen, B. M. S. and Barman, T. (2007). Two Classes of Hot Jupiters. The Astrophysical Journal 671: 861–871.